#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <stdlib.h>
 
struct person
{
   char fname[20];
   char lname[15];
   char address[10];
   char telephone[10];
};
 
char Selection(char choice)
{
   printf("a. Data Entry");
   printf("\nb. Search and Edit a Record");
   printf("\nc. Search and Delete a Record");
   printf("\nd. Display all Records");
   printf("\ne. Exit from the program");
   printf("\n\nEnter your choice: ");
   scanf(" %c",&choice);
   return choice;
}
 
int Data_Entry (struct person prson[20], int i)
{
   char fn[20], ln[15], addy[50], tphone[10];
 
   printf("Enter info for student no. %d",i+1);  gets("\n");
   printf("\nFirst Name: ");  gets(fn);
   strcpy(prson[i].fname, fn);
   printf("Last Name: ");  gets(ln);
   strcpy(prson[i].lname, ln);
   printf("Address: ");  gets(addy);
   strcpy(prson[i].address, addy);
   printf("Telephone No.: ");  gets(tphone);
   strcpy(prson[i].telephone, tphone);
   i++;
   return i;
}
 
int Data_Edit(struct person prson[20], int i)
{
   int j=0, k=3, found=0;  char ans;  char last[15];  char first[20];
   char lastn[15];  char firstn[20];  char addr[10];  char tele[10];
 
   printf("Enter last name: ");  gets("\n");  gets(last);
   printf("\nEnter first name: ");  gets(first);
 
   for ( j=0;j<i;j++ )
   {
      if ( stricmp(last, prson[j].lname)==0 &&
	   stricmp(first, prson[j].fname)==0 )
      {
	 found=1;
	 clrscr();
	 printf("Name                     Address                   Tel. No.");
	 gotoxy(1,k);printf("%s, %s",prson[j].lname, prson[j].fname);
	 gotoxy(30,k);printf("%s",prson[j].address);
	 gotoxy(60,k);printf("%s",prson[j].telephone);
 
	 gotoxy(1,k+3);printf("Continue editing?(Y/N): ");
	 scanf(" %c",&ans);  gets("\n");
	 if ( ans=='y' || ans=='Y' )
	 {
	    printf("\n\nEnter last name: ");  gets(lastn);
	    strcpy(prson[j].lname, lastn);
	    printf("\nEnter first name: ");  gets(firstn);
	    strcpy(prson[j].fname, firstn);
	    printf("\nAddress: ");  gets(addr);
	    strcpy(prson[j].address, addr);
	    printf("\nTelephone No.: ");  gets(tele);
	    strcpy(prson[j].telephone, tele);
	 }
      }
   }
   if ( found==0 )  
   {
      printf("\n\nThe name you entered cannot be found.");
      getch();
   }
 
}
 
int Data_Delete(struct person prson[20], int i)
{
   int a=0, j=0, k=3, found=0;  char ans2;  char lstn[15];
   char fstn[20];  char addre[10];  char telle[10];
 
   printf("Enter last name: ");  gets("\n");  gets(lstn);
   printf("\nEnter first name: ");  gets(fstn);
   for ( j=0;j<i;j++ )
   {
      if ( stricmp(lstn, prson[j].lname)==0 &&
	   stricmp(fstn, prson[j].fname)==0 )
      {
	 found=1;
	 clrscr();
	 printf("Name                     Address                   Tel. No.");
	 gotoxy(1,k);printf("%s, %s",prson[j].lname, prson[j].fname);
	 gotoxy(30,k);printf("%s",prson[j].address);
	 gotoxy(60,k);printf("%s",prson[j].telephone);
 
	 gotoxy(1,k+3);printf("Continue deleting?(Y/N): ");
	 scanf(" %c",&ans2);  gets("\n");
	 if ( ans2=='y' || ans2=='Y' )
         {
	    strcpy(prson[j].lname, prson[j+1].lname);
	    strcpy(prson[j].fname, prson[j+1].fname);
	    i--;
	 }
      }
   }
   if ( found==0 )
   {
      printf("\n\nThe name you entered cannot be found.");
      getch();
   }
   return i;
}
 
Display(struct person prson[20], int i)
{
   int j, k=3;
   clrscr();
   printf("Name                     Address                   Tel. No.");
   for ( j=0;j<i;j++ )
   {
      gotoxy(1,k);printf("%s, %s",prson[j].lname, prson[j].fname);
      gotoxy(30,k);printf("%s",prson[j].address);
      gotoxy(60,k);printf("%s",prson[j].telephone);
      k++;
   }
   getch();
}
 
typedef struct person prson;
 
main()
{
   int i=0;
   struct person prson[20];
   char choice='';
   do
   {
      clrscr();
      choice=Selection(choice);
      if ( choice=='a' )
      {
	 clrscr();
	 i=Data_Entry(prson,i);
      }
      if ( choice=='b' )
      {
	 clrscr();
	 Data_Edit(prson, i);
      }
      if ( choice=='c' )
      {
	 clrscr();
	 i=Data_Delete(prson,i);
      }
      if ( choice=='d' )
      {
	 Display(prson, i);
      }
   } while ( choice!='e' );
   printf("\n\n\n       Good Bye!");
   getch();
}