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Doubly Linked List Implementation

by on Nov 21st, 2004
This program maintains a employee's record using Doubly linked list.It was a weekly project submission by me for the course CI 031 .Invloves simple graphics and a login menu where i had used file handling to maintain a record of 3 user's name and their password .So before running the program kindly create a text document in d:\ with the name LOGIN.txt .In this just add the following data :

ceo computer
manager mouse
admin hello123

i.e only 3 persons can be allowed to login with their respective passwrd.
Platforn : Turbo c++ IDE
C Code Snippet (Toggle Plain Text) 
  1. ///////////////////////////////////////////////////////////////////////////
  2. ///////////////////                EMPLOYEE RECORDS 	      //////////////
  3. /////////////////////////////////////////////////////////////////////////
  4.  
  5. /*  REFERENCES : DATA STRUCTURES THROUGH C - Y. KARNETKAR.
  6. 		 GRAPHICS UNDER C          - Y. KARNETKAR.
  7. 		 LET US C                  - Y. KARNETKAR.
  8. 		 PROGRAMMING WITH C        - SCAUM'S OUTLINE.
  9. 		 THE C LANGUAGE            - E. BALAGURUSWAMY.
  10. 		 WWW.PROGRAMMERSHEAVEN.COM
  11. 		 TURBO C++ IDE HELP INDEX
  12. */
  13. /**********************************************************************
  14.   This project is submitted by Harsh Chandra B.Tech ,2nd year,CSE on
  15.   account of  regular project submission as mentioned in the coarse
  16.   prescribed CI031-Data Structures.This project can be used by anyone
  17.   in future.If any changes made plzz do inform us on harshchandra@gmail.com.  Since this project is highly commented,so i dont think that anymore explanation is needed,however for any further queries plzz contact   on above Email ID.
  18. **********************************************************************/
  19.  
  20.  
  21. #include<dos.h>
  22. #include<string.h>
  23. #include <graphics.h>
  24. #include <stdlib.h>
  25. #include <stdio.h>
  26. #include <conio.h>
  27. #include<alloc.h>
  28. struct login           /* Used for records of authorised login */
  29. {  char username[30];
  30.    char password[15];
  31. };
  32. struct login l[3];/* as authorised users are ceo,manager and administrator */
  33.  
  34. struct employee
  35. {                       /* structure of Double linked list */
  36.  int employee_no;
  37.  char employee_name[20];
  38.  float grosspay;
  39.  char designation[10];
  40.  int age;
  41.  char sex[6];
  42.  struct employee *nextptr;
  43.  struct employee *previousptr;
  44. };
  45.  
  46. typedef struct employee employee;
  47. /*********************************FUNCTION PROTOTYPE***************************/
  48. void music(int);                          /*    FOR GENERATING SOUND       */
  49. void border_margin(void);               /*     CREATING BORDER           */
  50. void printmain(void);                 /*     PRINTING MAIN             */
  51. void new_employee();                /*   APPEND FUNCTIONS            */
  52. void display(employee *);         /*  PRINTING THE RECORDS         */
  53. void delete_employee();         /*  DELETING THE RECORDS         */
  54. void update();                /*    TO MODIFY FUNCTION         */
  55. void search_employee(int);  /*    SEARCHING RECORDS          */
  56. void printdetail(void);
  57. employee *getnode(int);       /* FOR CREATING NEW NODES (MALLOC) */
  58. employee *head=NULL;      /* INITIALLY LINKED LIST IS EMPTY  */
  59. employee *tail=NULL;
  60.  
  61. /******************************************************************************/
  62.  
  63. int k,i,j,count=0;
  64. char ans,choice,choice1,choice2,choice3; /* for accessing menu */
  65. void main()
  66. {     /* request auto detection */
  67. 	 int gdriver = DETECT, gmode, errorcode;
  68. 	 int maxx, maxy,i,count=0,flag=0;
  69. 	 /* initialize graphics, local variables */
  70. 	 initgraph(&gdriver, &gmode, "c:\\tc\\bgi");
  71.  
  72. 	 /* read result of initialization */
  73. 	 errorcode = graphresult();
  74. 	 if (errorcode != grOk) /* If an error occurred as grOK means no error */
  75. 	 {  clrscr();
  76. 		 printf("Graphics Error Detected : %s\n", grapherrormsg(errorcode));
  77. 		 printf("Press any key to halt....");
  78. 		 printf("\nThank You.\t\n- Comp. Science Students.\n  Batch : C-5 and C6");
  79. 		 printf("\n  Jaypee University Of Information Technology , Waknaghat");
  80. 		 getch();
  81. 		 exit(0);  /* Terminate with an error code */
  82. 	 }
  83.  
  84. 	  maxx = getmaxx();
  85. 	  maxy = getmaxy();
  86. 	  setcolor(YELLOW);              /*    select drawing color           */
  87. 	  setfillstyle(SOLID_FILL,BLUE);  /*     select fill color             */
  88. 	  rectangle(0, 0, maxx, maxy);   /*   draw a border around the screen */
  89. 	  bar(0,0,maxx,maxy);           /*    for painting background blue   */
  90. 	  settextstyle(5,0,6);
  91. 	  outtextxy(130,50,"Employee Records");
  92. 	  outtextxy(250,130,"Of A");
  93. 	  outtextxy(210,210,"Company");
  94. 	  settextstyle(2,0,7);
  95. 	  outtextxy(120,300,"A DOUBLY LINKED LIST IMPLEMENTATION");
  96. 	  settextstyle(2,0,4);
  97. 	  outtextxy(100,360,"PRESS A KEY TO CONTINUE ....");
  98. 	  music(3);
  99. /********************** END OF INTRO SCREEN **************************************/
  100.  
  101. 	 cleardevice();  /* CLEARS THE SCREEN */
  102. 	 settextstyle(0,0,0);
  103. 	 setfillstyle(SOLID_FILL,BLUE);  /*  select fill color               */
  104. 	 rectangle(0, 0, maxx, maxy);   /*   draw a border around the screen */
  105. 	 bar(0,0,maxx,maxy);           /*    for painting background blue      */
  106. 	 setcolor(YELLOW);
  107. 	 outtextxy(25,30,"ÿ");outtextxy(30,30,"Î");
  108. 	 outtextxy(30,25,"º");
  109. 	 for(i=35;i<=450;i+=5)
  110. 		outtextxy(30,i,"º");
  111. 	 for(i=35;i<=600;i+=5)
  112. 		outtextxy(i,30,"ÿ");
  113. 	 settextstyle(5,0,5);outtextxy(90,50,"About the Project");
  114. 	 char str1[70]={"Programmers : Students Of Batch C5 & C6"};
  115. 	 char str2[30]={"Platform    : Turbo C++ IDE"};
  116. 	 char str3[30]={"Duration    : Approx 10 Days"};
  117. 	 char str4[34]={"Instructor  : Mr.Satish Chandra"};
  118. 	 char str5[30]={"Contacts    : +919816184767"};
  119. 	 char str6[30]={"®® Press A Key To Continue ¯¯"};
  120. 	 int j=10,k=12;
  121. 	 settextstyle(0,0,0);
  122. 	 for(i=0;str1[i]!='\0';i++)
  123. 	 {  gotoxy(j,k);printf("");delay(5);
  124. 	    gotoxy(j,k);printf("%c",str1[i]);
  125. 	    music(4);
  126. 	    j++;
  127. 	 }
  128. 	 music(5);
  129. 	 j=10;k=14;
  130. 	 for(i=0;str2[i]!='\0';i++)
  131. 	 {  gotoxy(j,k);printf("");delay(5);
  132. 	    gotoxy(j,k);printf("%c",str2[i]);
  133. 	    music(4);
  134. 	    j++;
  135. 	 }
  136. 	 music(5);
  137. 	 j=10;k=16;
  138. 	 for(i=0;str3[i]!='\0';i++)
  139. 	 {  gotoxy(j,k);printf("");delay(5);
  140. 	    gotoxy(j,k);printf("%c",str3[i]);
  141. 	    music(4);
  142. 	    j++;
  143. 	 }
  144. 	 music(5);
  145. 	 j=10;k=18;
  146. 	 for(i=0;str4[i]!='\0';i++)
  147. 	 {  gotoxy(j,k);printf("");delay(5);
  148. 	    gotoxy(j,k);printf("%c",str4[i]);
  149. 	    music(4);
  150. 	    j++;
  151. 	 }
  152. 	 music(5);
  153. 	 j=10;k=20;
  154. 	 for(i=0;str5[i]!='\0';i++)
  155. 	 {  gotoxy(j,k);printf("");delay(5);
  156. 	    gotoxy(j,k);printf("%c",str5[i]);
  157. 	    music(4);
  158. 	    j++;
  159. 	 }
  160. 	 music(5);
  161. 	 j=25;k=24;
  162. 	 for(i=0;str6[i]!='\0';i++)
  163. 	 {  gotoxy(j,k);printf("");delay(5);
  164. 		 gotoxy(j,k);printf("%c",str6[i]);
  165. 		 music(4);
  166. 		 j++;
  167. 	 }
  168. 	 getch();
  169. /*************************** END OF SECOND SCREEN **********************************/
  170.  
  171. // LOGIN MENU
  172. 	 cleardevice();
  173. 	 logi:  /* label to return in case access is denied */
  174. 	 setfillstyle(SOLID_FILL,BLUE);  /*  select fill color               */
  175. 	 rectangle(0, 0, maxx, maxy);   /*   draw a border around the screen */
  176. 	 bar(0,0,maxx,maxy);           /*    for painting background blue      */
  177. 	 settextstyle(5,0,5);
  178. 	 setcolor(YELLOW);
  179. 	 outtextxy(110,90,"®® Login Menu ¯¯");
  180. 	 settextstyle(0,0,0);
  181. 	 k = 155;
  182. 	 outtextxy(150,220,"É");
  183. 	 for(i=0;i<=1050;i+=4)
  184. 	 {   outtextxy(k,220,"ÿ");
  185. 		  k++;
  186. 	 }
  187. 	 outtextxy(424,220,"»");outtextxy(150,225,"º");
  188. 	 outtextxy(150,230,"º");outtextxy(150,235,"º");
  189. 	 outtextxy(150,240,"º");outtextxy(150,245,"Ì");
  190. 	 outtextxy(424,225,"º");outtextxy(424,230,"º");
  191. 	 outtextxy(424,235,"º");outtextxy(424,240,"º");
  192. 	 outtextxy(424,245,"¹");outtextxy(150,250,"º");
  193. 	 outtextxy(150,255,"º");outtextxy(150,260,"º");
  194. 	 outtextxy(150,265,"È");outtextxy(424,250,"º");
  195. 	 outtextxy(424,255,"º");outtextxy(424,260,"º");
  196. 	 outtextxy(424,265,"¼");outtextxy(160,235,"USERNAME : ");
  197. 	 outtextxy(160,255,"PASSWORD : ");
  198. 	 k=155;
  199. 	 char str7[15],str8[10],character;
  200. 	 for(i=0;i<=1050;i+=4)
  201. 	 {   outtextxy(k,245,"ÿ");
  202. 	k++;
  203. 	 }
  204. 	 k=155;
  205. 	 for(i=0;i<=1050;i+=4)
  206. 	 {   outtextxy(k,265,"ÿ");
  207. 	k++;
  208. 	 }
  209. 	 gotoxy(31,15);gets(str7);
  210. 	 i=0;k=31;
  211. 	 do
  212. 	 {      character=getch(); /* These thing is done so that password is not visible*/
  213. 		gotoxy(k,17) ;printf("*");
  214. 		str8[i]=character;
  215. 		k++;
  216. 		i++;
  217. 	 }while(character != '.');
  218. 	 i--;
  219. 	 str8[i]='\0';
  220. 	 /* NOW COMING THE FILE HANDLING */
  221. 	FILE *fp;
  222. 	i=0;flag=0;
  223. 	fp=fopen("d:\LOGIN.txt","r+");/* login.txt already contains the username n paswd*/
  224. 	while(fscanf(fp,"%s\t%s\n",l[i].username,l[i].password)!= EOF)
  225. 	{
  226. 	  if(strcmp(str7,l[i].username)==0 && strcmp(str8,l[i].password)==0)
  227. 	  { flag=1;
  228. 	  }
  229. 	  i++;
  230. 	}
  231. 	settextstyle(10,0,1);
  232. 	if(flag==0)
  233. 	{  outtextxy(140,275,"®® ACCESS DENIED ¯¯ ");music(1);music(1);
  234. 		outtextxy(140,320,"PRESS A KEY TO CONTINUE...");
  235. 		getch();
  236. 		count++;
  237. 		if(count< 3)
  238. 		{  goto logi; /* i m giving 3 chances in case user make any mistakes */
  239. 		}
  240. 		else
  241. 		exit(0);/* go out of program as access is denied */
  242. 	}
  243. 	else
  244. 	{ outtextxy(140,275,"ACCESS GRANTED ¯ ¯ ¯");music(1);music(1);
  245. 	  outtextxy(140,320,"PRESS A KEY TO CONTINUE...");
  246. 	}
  247. 	fclose(fp);
  248. 	getch();
  249. 	closegraph();
  250. 	restorecrtmode();
  251.  
  252. /**********************************************************************************
  253. 			 Now coming to main menu if access granted                             */
  254.  
  255.  int key;
  256.  main:
  257.  printmain();  /* WILL PRINT THE MAIN MENU */
  258.  gotoxy(45,21);choice=getche();
  259.  switch(choice)
  260.   {
  261. 	case '1':
  262. 	new_employee();   /* APPENDING THE RECORD */
  263. 	getch();
  264. 	goto main;
  265.  
  266.  
  267. 	case '2':
  268. 	clrscr();
  269. 	display(head);    /* PRINTING THE RECORDS */
  270. 	goto main;
  271.  
  272.  
  273. 	case '3':
  274. 	delete_employee();
  275. 	goto main;
  276.  
  277. 	case '4':
  278. 	update();   /* MODIFYING THE RECORDS */
  279. 	goto main;
  280.  
  281. 	case '5':
  282. 	clrscr();
  283. 	border_margin();
  284. 	gotoxy(25,6);cprintf("R E C O R D    S E A R C H");
  285. 	gotoxy(5,8);cprintf("ENTER THE EMPLOYEE NUMBER WHICH IS TO BE UPDATED : ");
  286. 	gotoxy(57,8);scanf("%d",&key);
  287. 	search_employee(key);
  288. 	getch();
  289. 	goto main;
  290.  
  291. 	case '6':
  292. 		 border_margin();
  293. 		 gotoxy(25,11);cprintf("É");
  294. 		 k=26;
  295. 		 for(i=1;i<=24;i++)
  296. 		 { gotoxy(k,11);cprintf("ÿ");
  297. 			k++;
  298. 		 }
  299. 		 gotoxy(50,11);cprintf("»");
  300. 		 gotoxy(25,12);cprintf("º                        º");
  301. 		 gotoxy(25,13);cprintf("È");gotoxy(50,13);cprintf("¼");
  302. 		 k=26;
  303. 		 for(i=1;i<=24;i++)
  304. 		 { gotoxy(k,13);cprintf("ÿ");
  305. 			k++;
  306. 		 }
  307. 		 gotoxy(32,9);cprintf("QUITING ....");
  308. 		 k=26;
  309. 		 for(i=1;i<=24;i++)
  310. 		 { gotoxy(k,12);cprintf("ÿ");delay(50);
  311. 			k++;
  312. 		 }
  313. 		 gotoxy(22,19);textcolor(YELLOW + BLINK);
  314. 		 cprintf("PRESS A KEY TO RETURN TO WINDOWS");
  315. 		 gotoxy(30,17);textcolor(YELLOW);cprintf("B Y E    B Y E !!");
  316. 		 gotoxy(24,79);
  317. 		 getch();
  318. 		 break;
  319.  
  320. 	default:
  321. 	goto main;
  322.  
  323.   }
  324.   }
  325.  
  326.  
  327. void new_employee()
  328. {      clrscr();
  329.        border_margin();
  330.        employee *emp;
  331.        textcolor(YELLOW);
  332.        gotoxy(25,3);cprintf("E N T E R I N G   R E C O R D");
  333.        printdetail();
  334.        if(head==NULL&&tail==NULL)
  335.        {    count++;
  336. 	    emp=getnode(count);
  337. 	    head=emp;
  338. 	    tail=emp;
  339. 	    emp->previousptr=NULL;
  340. 	    emp->nextptr=NULL;
  341. 	}
  342.  
  343. 	else
  344. 	{    count++;
  345. 	     emp=getnode(count);
  346. 	     emp->previousptr=tail;
  347. 	     tail->nextptr=emp;
  348. 	     emp->nextptr=NULL;
  349. 	     tail=emp;
  350. 	}
  351.  
  352.   }
  353.  
  354.  
  355.  
  356. void display(employee *temp)
  357. { if(head==NULL)  /* EMPTY LINKED LIST */
  358.   { clrscr();
  359.     border_margin();
  360.     gotoxy(25,10);cprintf("É");
  361.       k=26;
  362.   for(i=1;i<=24;i++)
  363.   { gotoxy(k,10);cprintf("ÿ");
  364.     k++;
  365.   }
  366.   gotoxy(50,10);cprintf("»");
  367.   gotoxy(25,11);cprintf("º   NO RECORDS AVAILABLE º");
  368.   gotoxy(25,12);cprintf("È");gotoxy(50,12);cprintf("¼");
  369.   k=26;
  370.   for(i=1;i<=24;i++)
  371.   { gotoxy(k,12);cprintf("ÿ");
  372.     k++;
  373.   }
  374.   music(1);music(1);
  375.  
  376.   }
  377.   else
  378.   { if(temp==head)
  379.     do
  380.     { clrscr();
  381.       border_margin();
  382.       gotoxy(25,5);cprintf("P R I N T I N G   R E C O R D");
  383.       printdetail();
  384.       gotoxy(20,7);cprintf("%d",temp->employee_no);
  385.       gotoxy(20,9);puts(temp->employee_name);
  386.       gotoxy(20,11);cprintf("%f",temp->grosspay);fflush(stdin);
  387.       gotoxy(20,13);puts(temp->designation);
  388.       gotoxy(20,15);cprintf("%d",temp->age);fflush(stdin);
  389.       gotoxy(20,17);puts(temp->sex);
  390.  
  391.       gotoxy(25,20);cprintf("É");
  392.       k=26;
  393.   for(i=1;i<=24;i++)
  394.   { gotoxy(k,20);cprintf("ÿ");
  395.     k++;
  396.   }
  397.   gotoxy(50,20);cprintf("»");
  398.   gotoxy(25,21);cprintf("º HIT KEY FOR NEXT RECORDº");
  399.   gotoxy(25,22);cprintf("È");gotoxy(50,22);cprintf("¼");
  400.   k=26;
  401.   for(i=1;i<=24;i++)
  402.   { gotoxy(k,22);cprintf("ÿ");
  403.     k++;
  404.   }
  405.   music(1);music(1);
  406.   getch();
  407.   temp=temp->nextptr;
  408.  
  409.   }while(temp!=NULL);
  410.  
  411.    }
  412. }
  413.  
  414. void delete_employee()
  415. {
  416.   int key,flag;
  417.   employee *temp;
  418.   temp=head;
  419.   if(head==NULL)  /* EMPTY LINKED LIST */
  420.   { clrscr();
  421.     border_margin();
  422.     gotoxy(25,10);cprintf("É");
  423.       k=26;
  424.   for(i=1;i<=24;i++)
  425.   { gotoxy(k,10);cprintf("ÿ");
  426.     k++;
  427.   }
  428.   gotoxy(50,10);cprintf("»");
  429.   gotoxy(25,11);cprintf("º   NO RECORDS AVAILABLE º");
  430.   gotoxy(25,12);cprintf("È");gotoxy(50,12);cprintf("¼");
  431.   k=26;
  432.   for(i=1;i<=24;i++)
  433.   { gotoxy(k,12);cprintf("ÿ");
  434.     k++;
  435.   }
  436.   music(1);music(1);
  437.   goto last;
  438.   }
  439.   else
  440.   { clrscr();
  441.     border_margin();
  442.     gotoxy(10,7);cprintf("ENTER THE EMPLOYEE NUMBER YOU WANT TO DELETE : ");
  443.     gotoxy(55,7);scanf("%d",&key);
  444.     border_margin();
  445.     gotoxy(25,11);cprintf("É");
  446.     k=26;
  447.     for(i=1;i<=24;i++)
  448.     { gotoxy(k,11);cprintf("ÿ");
  449.       k++;
  450.     }
  451.     gotoxy(50,11);cprintf("»");
  452.     gotoxy(25,12);cprintf("º                        º");
  453.     gotoxy(25,13);cprintf("È");gotoxy(50,13);cprintf("¼");
  454.     k=26;
  455.     for(i=1;i<=24;i++)
  456.     { gotoxy(k,13);cprintf("ÿ");
  457.       k++;
  458.     }
  459.     gotoxy(25,9);cprintf("SEARCHING FOR RECORDS ...");
  460.     k=26;
  461.     for(i=1;i<=24;i++)
  462.     { gotoxy(k,12);cprintf("ÿ");delay(50);
  463.       k++;
  464.     }
  465.     gotoxy(22,19);textcolor(YELLOW);
  466.     cprintf("PRESS A KEY TO RETURN TO CONTINUE ...");
  467.     gotoxy(28,17);cprintf("SEARCHING COMPLETE");
  468.     getch();
  469.  
  470.     /* traverse the entire linked list */
  471.     while(temp!=NULL)
  472.     {  if(temp->employee_no == key)
  473.      {   flag++;
  474. 	 if(temp==head)   /* if node is first */
  475. 	 {   head=head->nextptr;
  476. 	     head->previousptr=NULL;
  477. 	 }
  478. 	 else
  479. 	 {  if(temp->nextptr==NULL) /* if node is last */
  480. 	    temp->previousptr->nextptr=NULL;
  481. 	    else
  482. 	    {  temp->previousptr->nextptr = temp->nextptr;
  483. 	       temp->nextptr->previousptr = temp->previousptr;
  484. 	    }
  485. 	    free(temp);
  486. 	  }
  487.      }
  488.       temp=temp->nextptr;
  489.   }
  490.   }
  491.   if(flag==0)
  492.   {   clrscr();
  493.       border_margin();
  494.       gotoxy(25,10);cprintf("É");
  495.       k=26;
  496.       for(i=1;i<=24;i++)
  497.       { gotoxy(k,10);cprintf("ÿ");
  498. 	k++;
  499.       }
  500.       gotoxy(50,10);cprintf("»");
  501.       gotoxy(25,11);cprintf("º     NO RECORDS FOUND   º");
  502.       gotoxy(25,12);cprintf("È");gotoxy(50,12);cprintf("¼");
  503.       k=26;
  504.       for(i=1;i<=24;i++)
  505.      { gotoxy(k,12);cprintf("ÿ");
  506.        k++;
  507.      }
  508.      music(1);music(1);
  509.      getch();
  510.   }
  511.   if(flag==1)
  512.   { clrscr();
  513.     border_margin();
  514.     gotoxy(25,10);cprintf("É");
  515.     k=26;
  516.     for(i=1;i<=24;i++)
  517.   { gotoxy(k,10);cprintf("ÿ");
  518.     k++;
  519.   }
  520.   gotoxy(50,10);cprintf("»");
  521.   gotoxy(25,11);cprintf("º     RECORD DELETED     º");
  522.   gotoxy(25,12);cprintf("È");gotoxy(50,12);cprintf("¼");
  523.   k=26;
  524.   for(i=1;i<=24;i++)
  525.   { gotoxy(k,12);cprintf("ÿ");
  526.     k++;
  527.   }
  528.   music(1);music(1);
  529.   getch();
  530.   }
  531.   last:
  532.   getch();
  533. }
  534.  
  535. void update()
  536. { int choice;
  537.   char str[30];
  538.   char f;
  539.   employee *temp;
  540.   temp=head;
  541.   if(head==NULL)  /* EMPTY LINKED LIST */
  542.   { clrscr();
  543.     border_margin();
  544.     gotoxy(25,10);cprintf("É");
  545.       k=26;
  546.   for(i=1;i<=24;i++)
  547.   { gotoxy(k,10);cprintf("ÿ");
  548.     k++;
  549.   }
  550.   gotoxy(50,10);cprintf("»");
  551.   gotoxy(25,11);cprintf("º   NO RECORDS AVAILABLE º");
  552.   gotoxy(25,12);cprintf("È");gotoxy(50,12);cprintf("¼");
  553.   k=26;
  554.   for(i=1;i<=24;i++)
  555.   { gotoxy(k,12);cprintf("ÿ");
  556.     k++;
  557.   }
  558.   music(1);music(1);
  559.  
  560.   }
  561.   else
  562.   { clrscr();
  563.     border_margin();
  564.     gotoxy(25,3);cprintf("R E C O R D    U P D A T E");
  565.     gotoxy(5,5);cprintf("ENTER THE EMPLOYEE NUMBER WHICH IS TO BE UPDATED : ");
  566.     gotoxy(57,5);scanf("%d",&choice);
  567.     if(choice > count)
  568.     { clrscr();
  569.       border_margin();
  570.       gotoxy(10,10);cprintf("EMPLOYEE NO NOT FOUND");
  571.       getch();
  572.       goto last;
  573.     }
  574.     again:
  575.     gotoxy(5,10);cprintf("1. NAME ");gotoxy(5,11);cprintf("2. GROSS PAY");
  576.     gotoxy(5,12);cprintf("3. DESIGNATION");gotoxy(5,13);cprintf("4. AGE");
  577.     gotoxy(5,14);cprintf("5. SEX");
  578.     gotoxy(5,16);cprintf("ENTER THE FIELD YOU WANT TO EDIT : ");
  579.     gotoxy(41,16);fflush(stdin);f=getch();
  580.     switch(f)
  581.     {  case '1':
  582.      fflush(stdin);
  583.      gotoxy(5,18);cprintf("ENTER NEW NAME : ");gets(str);
  584.      while(choice!=temp->employee_no)
  585.      temp=temp->nextptr;
  586.      clrscr();
  587.      printdetail();
  588.      gotoxy(20,7);printf("%d",temp->employee_no);
  589.      strcpy(temp->employee_name,str);
  590.      gotoxy(20,9);printf("%s",temp->employee_name);
  591.      gotoxy(20,11);printf("%f",temp->grosspay);
  592.      gotoxy(20,13);puts(temp->designation);
  593.      gotoxy(20,15);printf("%d",temp->age);
  594.      gotoxy(20,17);puts(temp->sex);
  595.      break;
  596.      case '2':
  597.      float gp;
  598.      fflush(stdin);
  599.      gotoxy(20,18);cprintf("ENTER NEW GROSS : ");scanf("%f",&gp);
  600.      while(choice!=temp->employee_no)
  601.      temp=temp->nextptr;
  602.      clrscr();
  603.      printdetail();
  604.      gotoxy(20,7);printf("%d",temp->employee_no);
  605.      temp->grosspay = gp;
  606.      gotoxy(20,9);printf("%s",temp->employee_name);
  607.      gotoxy(20,11);printf("%f",temp->grosspay);
  608.      gotoxy(20,13);puts(temp->designation);
  609.      gotoxy(20,15);printf("%d",temp->age);
  610.      gotoxy(20,17);puts(temp->sex);
  611.      break;
  612.      case '3':
  613.      fflush(stdin);
  614.      gotoxy(20,18);cprintf("ENTER NEW DESIGNATION : ");gets(str);
  615.      while(choice!=temp->employee_no)
  616.      temp=temp->nextptr;
  617.      clrscr();
  618.      printdetail();
  619.      gotoxy(20,7);printf("%d",temp->employee_no);
  620.      strcpy(temp->designation,str);
  621.      gotoxy(20,9);printf("%s",temp->employee_name);
  622.      gotoxy(20,11);printf("%f",temp->grosspay);
  623.      gotoxy(20,13);puts(temp->designation);
  624.      gotoxy(20,15);printf("%d",temp->age);
  625.      gotoxy(20,17);puts(temp->sex);
  626.      break;
  627.      case '4':
  628.      int gp1;
  629.      fflush(stdin);
  630.      gotoxy(20,18);cprintf("ENTER NEW AGE : ");scanf("%d",&gp1);
  631.      while(choice!=temp->employee_no)
  632.      temp=temp->nextptr;
  633.      clrscr();
  634.      printdetail();
  635.      gotoxy(20,7);printf("%d",temp->employee_no);
  636.      temp->age = gp1;
  637.      gotoxy(20,9);printf("%s",temp->employee_name);
  638.      gotoxy(20,11);printf("%f",temp->grosspay);
  639.      gotoxy(20,13);puts(temp->designation);
  640.      gotoxy(20,15);printf("%d",temp->age);
  641.      gotoxy(20,17);puts(temp->sex);
  642.      break;
  643.      case '5':
  644.      fflush(stdin);
  645.      gotoxy(20,18);cprintf("ENTER NEW SEX : ");gets(str);
  646.      while(choice!=temp->employee_no)
  647.      temp=temp->nextptr;
  648.      clrscr();
  649.      printdetail();
  650.      gotoxy(20,7);printf("%d",temp->employee_no);
  651.      strcpy(temp->sex,str);
  652.      gotoxy(20,9);printf("%s",temp->employee_name);
  653.      gotoxy(20,11);printf("%f",temp->grosspay);
  654.      gotoxy(20,13);puts(temp->designation);
  655.      gotoxy(20,15);printf("%d",temp->age);
  656.      gotoxy(20,17);puts(temp->sex);
  657.      break;
  658.      default:
  659.      goto again;
  660.   }
  661. 	gotoxy(25,20);cprintf("É");
  662. 	k=26;
  663. 	for(i=1;i<=24;i++)
  664. 	{ gotoxy(k,20);cprintf("ÿ");
  665. 	  k++;
  666. 	}
  667. 	gotoxy(50,20);cprintf("»");
  668. 	gotoxy(25,21);cprintf("º    RECORD    UPDATED   º");
  669. 	gotoxy(25,22);cprintf("È");gotoxy(50,22);cprintf("¼");
  670. 	k=26;
  671. 	for(i=1;i<=24;i++)
  672. 	{ gotoxy(k,22);cprintf("ÿ");
  673. 	  k++;
  674. 	}
  675. 	music(1);music(1);
  676.    }
  677.    last:
  678.    getch();
  679. }
  680.  
  681. employee *getnode(int count)
  682. { employee *nodeptr;
  683.   nodeptr=(employee *)malloc(sizeof(employee));
  684.   nodeptr->employee_no=count;
  685.   gotoxy(20,7);printf("%d",nodeptr->employee_no);fflush(stdin);
  686.   gotoxy(20,9);gets(nodeptr->employee_name);
  687.   gotoxy(20,11);scanf("%f",&nodeptr->grosspay);fflush(stdin);
  688.   gotoxy(20,13);gets(nodeptr->designation);
  689.   gotoxy(20,15);scanf("%d",&nodeptr->age);fflush(stdin);
  690.   gotoxy(20,17);gets(nodeptr->sex);
  691.   gotoxy(25,20);cprintf("É");
  692.   k=26;
  693.   for(i=1;i<=24;i++)
  694.   { gotoxy(k,20);cprintf("ÿ");
  695.     k++;
  696.   }
  697.   gotoxy(50,20);cprintf("»");
  698.   gotoxy(25,21);cprintf("º RECORD ENTRY SUCESSFUL º");
  699.   gotoxy(25,22);cprintf("È");gotoxy(50,22);cprintf("¼");
  700.   k=26;
  701.   for(i=1;i<=24;i++)
  702.   { gotoxy(k,22);cprintf("ÿ");
  703.     k++;
  704.   }
  705.   music(1);music(1);
  706.   nodeptr->previousptr=NULL;
  707.   nodeptr->nextptr=NULL;
  708.   return nodeptr;
  709. }
  710.  
  711. void search_employee(int key)
  712. {   employee *temp;
  713.     clrscr();
  714.     border_margin();
  715.     gotoxy(25,11);cprintf("É");
  716.     k=26;
  717.     for(i=1;i<=24;i++)
  718.     { gotoxy(k,11);cprintf("ÿ");
  719.       k++;
  720.     }
  721.     gotoxy(50,11);cprintf("»");
  722.     gotoxy(25,12);cprintf("º                        º");
  723.     gotoxy(25,13);cprintf("È");gotoxy(50,13);cprintf("¼");
  724.     k=26;
  725.     for(i=1;i<=24;i++)
  726.     { gotoxy(k,13);cprintf("ÿ");
  727.       k++;
  728.     }
  729.     gotoxy(32,9);cprintf("SEARCHING...");
  730.     k=26;
  731.     for(i=1;i<=24;i++)
  732.     { gotoxy(k,12);cprintf("ÿ");delay(50);
  733.       k++;
  734.     }
  735.     gotoxy(22,19);textcolor(YELLOW);
  736.     cprintf("PRESS A KEY TO RETURN TO CONTINUE >>");
  737.     gotoxy(28,17);cprintf("SEARCHING COMPLETE");
  738.     getch();
  739.     temp=head;
  740.     int flag=0;
  741.     if(temp==NULL) /* LINKED LIST IS EMPTY */
  742.     { clrscr();
  743.       border_margin();
  744.       gotoxy(25,10);cprintf("É");
  745.       k=26;
  746.       for(i=1;i<=24;i++)
  747.       { gotoxy(k,10);cprintf("ÿ");
  748. 	k++;
  749.       }
  750.       gotoxy(50,10);cprintf("»");
  751.       gotoxy(25,11);cprintf("º   NO RECORDS AVAILABLE º");
  752.       gotoxy(25,12);cprintf("È");gotoxy(50,12);cprintf("¼");
  753.       k=26;
  754.       for(i=1;i<=24;i++)
  755.       { gotoxy(k,12);cprintf("ÿ");
  756. 	k++;
  757.       }
  758.       music(1);music(1);
  759.       goto last;
  760.     }
  761.     while(temp!=NULL)
  762.     {   if(temp->employee_no==key)
  763. 	{ flag++;
  764. 	  printdetail();
  765. 	  gotoxy(20,7);printf("%d",temp->employee_no);
  766. 	  gotoxy(20,9);puts(temp->employee_name);
  767. 	  gotoxy(20,11);printf("%f",temp->grosspay);
  768. 	  gotoxy(20,13);gets(temp->designation);
  769. 	  gotoxy(20,15);printf("%d",temp->age);
  770. 	  gotoxy(20,17);puts(temp->sex);
  771. 	  gotoxy(25,20);cprintf("É");
  772. 	  k=26;
  773. 	  for(i=1;i<=24;i++)
  774. 	  { gotoxy(k,20);cprintf("ÿ");
  775. 	    k++;
  776. 	  }
  777. 	  gotoxy(50,20);cprintf("»");
  778. 	  gotoxy(25,21);cprintf("º       RECORD FOUND     º");
  779. 	  gotoxy(25,22);cprintf("È");gotoxy(50,22);cprintf("¼");
  780. 	  k=26;
  781. 	  for(i=1;i<=24;i++)
  782. 	  { gotoxy(k,22);cprintf("ÿ");
  783. 	    k++;
  784. 	  }
  785. 	  music(1);music(1);
  786. 	}
  787. 	temp=temp->nextptr;
  788.      }
  789.       if(flag==0)
  790.       { clrscr();
  791. 	border_margin();
  792. 	clrscr();
  793. 	border_margin();
  794. 	gotoxy(25,10);cprintf("É");
  795. 	k=26;
  796. 	for(i=1;i<=24;i++)
  797. 	{ gotoxy(k,10);cprintf("ÿ");
  798. 	  k++;
  799. 	}
  800. 	gotoxy(50,10);cprintf("»");
  801. 	gotoxy(25,11);cprintf("º    RECORDS NOT FOUND   º");
  802. 	gotoxy(25,12);cprintf("È");gotoxy(50,12);cprintf("¼");
  803. 	k=26;
  804. 	for(i=1;i<=24;i++)
  805. 	{ gotoxy(k,12);cprintf("ÿ");
  806. 	  k++;
  807. 	}
  808. 	music(1);music(1);
  809.       }
  810.    last:
  811. }
  812.  
  813. void music(int no)
  814. {   /* Natural frequncies of 7 notes */
  815. 	 float octave[7]={130.81,146.83,164.81,174.61,196,220,246.94};
  816. 	 int n,i;
  817. 	 switch(no)
  818. 	 {  case 1:
  819. 	 for(i=0;i<7;i++)
  820. 	 {  sound(octave[i] * 8);
  821. 		 delay(30);
  822. 	 }
  823. 	 nosound();
  824. 	 break;
  825. 		 case 2:
  826. 		 for(i=0;i<15;i++)
  827. 	 {  n=random(7);
  828. 		 sound(octave[n] * 4);
  829. 		 delay(100);
  830. 	 }
  831. 	 nosound();
  832. 	 break;
  833. 		 case 3:
  834. 		 while(!kbhit())
  835. 	 {  n=random(7);
  836. 		 sound(octave[n] * 4);
  837. 		 delay(100);
  838. 	 }
  839. 	 nosound();
  840. 	 if(getch()==0)
  841. 	 getch();
  842. 	 break;
  843. 		 case 4:
  844. 		 for(i=4;i>=0;i--)
  845. 	 {  sound(octave[i] * 4);
  846. 		 delay(15);
  847. 	 }
  848. 	 nosound();
  849. 	 break;
  850. 		 case 5:
  851. 		 sound(octave[6] * 2);
  852. 		 delay(50);
  853.  
  854. 	 nosound();
  855. 	 }
  856.  }
  857.  
  858. void border_margin()
  859. {    clrscr();
  860. 	  textcolor(YELLOW);
  861. 	  int i,j=3;
  862. 	  gotoxy(2,2);cprintf("É");
  863. 	  for(i=0;i<74;i++)
  864. 	  { gotoxy(j,2);cprintf("ÿ");
  865. 		 j++;
  866. 	  }
  867. 	  gotoxy(77,2);cprintf("»");
  868. 	  j=3;
  869. 	  for(i=0;i<20;i++)
  870. 	  { gotoxy(2,j) ;cprintf("º");
  871. 		 gotoxy(77,j);cprintf("º");
  872. 		 j++;
  873. 	  }
  874. 	  gotoxy(2,23);cprintf("È");
  875. 	  j=3;
  876. 	  for(i=0;i<74;i++)
  877. 	  { gotoxy(j,23);cprintf("ÿ");
  878. 		 j++;
  879. 	  }
  880. 	  gotoxy(77,23);cprintf("¼");
  881. }
  882. void printmain()
  883. {  int k,i;
  884. 	border_margin(); /* user defined function to draw margin */
  885. 	textbackground(0); /* sets background none */
  886. 	textcolor(YELLOW);/* set text color */
  887. 	textbackground(RED);
  888. 	gotoxy(6,4);cprintf("É");
  889. 	k=7;
  890. 	for(i=1;i<=24;i++)
  891. 	{ gotoxy(k,4);cprintf("ÿ");
  892. 	  k++;
  893. 	}
  894. 	gotoxy(31,4);cprintf("»");
  895. 	gotoxy(6,5);cprintf("º 1. ADD  RECORDS        º");
  896. 	gotoxy(6,6);cprintf("È");gotoxy(31,6);cprintf("¼");
  897. 	k=7;
  898. 	for(i=1;i<=24;i++)
  899. 	{ gotoxy(k,6);cprintf("ÿ");
  900. 	  k++;
  901. 	}
  902.  
  903. 	gotoxy(43,4);cprintf("É");
  904. 	k=44;
  905. 	for(i=1;i<=24;i++)
  906. 	{ gotoxy(k,4);cprintf("ÿ");
  907. 	  k++;
  908. 	}
  909. 	gotoxy(68,4);cprintf("»");
  910. 	gotoxy(43,5);cprintf("º 2. DISPLAY  RECORDS    º");
  911. 	gotoxy(43,6);cprintf("È");gotoxy(68,6);cprintf("¼");
  912. 	k=44;
  913. 	for(i=1;i<=24;i++)
  914. 	{ gotoxy(k,6);cprintf("ÿ");
  915. 	  k++;
  916. 	}
  917.  
  918. 	gotoxy(6,9);cprintf("É");
  919. 	k=7;
  920. 	for(i=1;i<=24;i++)
  921. 	{ gotoxy(k,9);cprintf("ÿ");
  922. 	  k++;
  923. 	}
  924. 	gotoxy(31,9);cprintf("»");
  925. 	gotoxy(6,10);cprintf("º 3. DELETE  RECORDS     º");
  926. 	gotoxy(6,11);cprintf("È");gotoxy(31,11);cprintf("¼");
  927. 	k=7;
  928. 	for(i=1;i<=24;i++)
  929. 	{ gotoxy(k,11);cprintf("ÿ");
  930. 	  k++;
  931. 	}
  932.  
  933. 	gotoxy(43,9);cprintf("É");
  934. 	k=44;
  935. 	for(i=1;i<=24;i++)
  936. 	{ gotoxy(k,9);cprintf("ÿ");
  937. 	  k++;
  938. 	}
  939. 	gotoxy(68,9);cprintf("»");
  940. 	gotoxy(43,10);cprintf("º 4. UPDATE  RECORDS     º");
  941. 	gotoxy(43,11);cprintf("È");gotoxy(68,11);cprintf("¼");
  942. 	k=44;
  943. 	for(i=1;i<=24;i++)
  944. 	{ gotoxy(k,11);cprintf("ÿ");
  945. 	  k++;
  946. 	}
  947.  
  948. 	gotoxy(6,14);cprintf("É");
  949. 	k=7;
  950. 	for(i=1;i<=24;i++)
  951. 	{ gotoxy(k,14);cprintf("ÿ");
  952. 	  k++;
  953. 	}
  954. 	gotoxy(31,14);cprintf("»");
  955. 	gotoxy(6,15);cprintf("º 5. SEARCH FOR RECORDS  º");
  956. 	gotoxy(6,16);cprintf("È");gotoxy(31,16);cprintf("¼");
  957. 	k=7;
  958. 	for(i=1;i<=24;i++)
  959. 	{ gotoxy(k,16);cprintf("ÿ");
  960. 	  k++;
  961. 	}
  962.  
  963. 	gotoxy(43,14);cprintf("É");
  964. 	k=44;
  965. 	for(i=1;i<=24;i++)
  966. 	{ gotoxy(k,14);cprintf("ÿ");
  967. 	  k++;
  968. 	}
  969. 	gotoxy(68,14);cprintf("»");
  970. 	gotoxy(43,15);cprintf("º 6. QUIT                º");
  971. 	gotoxy(43,16);cprintf("È");gotoxy(68,16);cprintf("¼");
  972. 	k=44;
  973. 	for(i=1;i<=24;i++)
  974. 	{ gotoxy(k,16);cprintf("ÿ");
  975. 	  k++;
  976. 	}
  977. 	gotoxy(25,21);cprintf("ENTER YOUR CHOICE :   ");
  978.  
  979. }
  980. void printdetail()
  981. {      border_margin();
  982.        gotoxy(5,7);cprintf("EMPLOYEE NO  : ");
  983.        gotoxy(20,8);cprintf("____________________________________________");
  984.        gotoxy(5,9);cprintf("NAME         : ");
  985.        gotoxy(20,10);cprintf("____________________________________________");
  986.        gotoxy(5,11);cprintf("GROSS PAY    : ");
  987.        gotoxy(20,12);cprintf("____________________________________________");
  988.        gotoxy(5,13);cprintf("DESIGNATION  : ");
  989.        gotoxy(20,14);cprintf("____________________________________________");
  990.        gotoxy(5,15);cprintf("AGE          : ");
  991.        gotoxy(20,16);cprintf("____________________________________________");
  992.        gotoxy(5,17);cprintf("SEX          : ");
  993.        gotoxy(20,18);cprintf("____________________________________________");
  994. }
Comments on this Code Snippet
Permalink
Feb 12th, 2005
0

Re: Doubly Linked List Implementation

Wow that's great ...

Xmm you know I wonder ...nowadays I am trying to learn C language through analysing this kind of code's how do you think is it good way or not ... I am just studying myself ...selflearner...

Anyway let men know see your code..

Best wishes.
Light Poster
free_eagle is offline Offline
41 posts
since Jan 2005
Permalink
Jun 20th, 2010
-1

thanks man

hey its a very good program. the way you are programming is very good, i need your phone number, so that i can contact you.

sagar
Newbie Poster
ylnsagar is offline Offline
1 posts
since Jun 2010
Message:
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