Data strucrure

[danieldane]

//include files

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include"c:/includes.h"

//stores the structures of master and index file

#include"c:/function.cpp"   //stores all the functions for the file primitive

/* The main function
input: none
output:none
calleed by: OS.
calls: ADD_RECORD,DELETE_RECORD,MODIFY_RECORD,SEARCH_RECORD,DISPLAY_RECORD
*/


void main(void)

{

int choice;
int status;
int roll_no;
char ch;

    clrscr();
    printf("Enter the file name:");
    scanf("%s",f_name);
    printf("enter the index file name:");
    scanf("%s",if_name);
    ptr=fopen(f_name,"wb");
      if(ptr==NULL)
      {
    printf("file not found");
    getch();
    exit(0);
      }

    iptr=fopen(if_name,"wb");
      if(iptr==NULL)
      {
    printf("file not found");
    getch();
    exit(0);
      }


  fclose(ptr);
  fclose(iptr);
  while(1)
  {
      clrscr();
      printf("\n1.add");
      printf("\n2.delete");
      printf("\n3.modify");
      printf("\n4.search");
      printf("\n5.display");
      printf("\n6.exit");
      printf("\nEnter the choice:");
      scanf("%d",&choice);
      switch(choice)

      {
      case 1:
      status=ADD_RECORD();

      if(status==1)
      printf("The record has been succesfully added");

      else
      printf("The record could not be added");
      break;

      case 2:
      printf("Enter the roll_no of the record to delete:");
      scanf("%d",&roll_no);
      status=DELETE_RECORD(roll_no);

      if(status==1)
      printf("the record has been succesfully deleted");

      else
      printf("The record could not be found");
      break;

     case 3:
      printf("Enter the roll_no of the record to modify:");
      scanf("%d",&roll_no);
      status=MODIFY_RECORD(roll_no);

      if(status==1)
      printf("The record has been succesfully modified");

      else
      printf("The record could not be found");
      break;

     case 4:
      printf("Enter the roll_no of the record to search");
      scanf("%d",&roll_no);

      if(status==1)
      printf("The record has been found");

      else
      printf("The record could be found");

      getch();
      break;

     case 5:
      DISPLAY_ALL_RECORD();
      getch();
      break;

    case 6:
      getch();
      exit(0);

     }

     printf("Do you want to continue:");
     ch=getchar();

     if(ch=='n'||ch=='N')
     break;

   }
      getch();

  }

    /************************************************************
                 function.cpp
     ***********************************************************/
    /*
    the SORT_FILE function
    Input:none
    Output:1 or -1
    called by:ADD_RECORD
    calls:none
    */

    int SORT_FILE()

    {
     int size;
     int i,j;
     is ind, ind_temp;
     ss stud;
     int flag=0;

     iptr = fopen(if_name,"rb+");
     if(iptr==NULL)
    {
         printf("File not opened");
         return -1;
    }

    ptr = fopen(if_name,"rb+");
    if(ptr==NULL)
    {
           printf("File not opened");
           return -1;
     }


       size = 0;
           while(fread(&ind,sizeof(is),1,iptr))
           size++;

       fclose(iptr);
       iptr = fopen(if_name,"rb+");
       if(iptr==NULL)
       {
        printf("File not opened");
        return -1;
       }

       for(i=0;i<size;i++)
       {
        flag = 0;
        for(j=0;j<size - (i+1); j++)
      {
        fseek(iptr,j*sizeof(is),SEEK_SET);
        fread(&ind,sizeof(is),1,iptr);

         //fseek(iptr,j*size(is),1,SEEK_SET);

         fread(&ind_temp,sizeof(is),1,iptr);
         if(ind.iroll_no > ind_temp.iroll_no)
          {
        fseek(iptr,j*sizeof(is),SEEK_SET);
        fwrite(&ind_temp,sizeof(is),1,iptr);
        fseek(iptr,(j+1)*sizeof(is),SEEK_SET);
        fwrite(&ind,sizeof(is),1,iptr);
          flag = 1;
          }
      }
      if(flag==0)
         break;

    }
       fclose(iptr);
       return 1;

 }

  /*
  The ADD_RECORD function
  input:none
  output:1 or -1
  called by: main
  calls: SORT_FILE
  */

  int ADD_RECORD()

{

    ss stud;
    is ind;
    long offset;
    ptr = fopen(f_name,"rb+");
    if(ptr==NULL)
    {
        printf("File not opened");
        return -1;
    }

    while(fread(&stud,sizeof(stud),1,ptr);
    offset = ftell(ptr);
    printf("Enter the name of the student");
    fflush(stdin);
    scanf("%s",&stud.name);
    printf("Enter the roll no. of the student");
    fflush(stdin);
    scanf("%d",&stud.roll_no);
    printf("Enter the age of the student");
    fflush(stdin);
    scanf("%d",&stud.age);
    printf("Enter the marks of the student");
    fflush(stdin);
    scanf("%d",&stud.mark);
    fwrite(&stud,sizeof(stud),1,ptr);
    fclose(ptr);
    iptr = fopen(if_name,"ab+");
       if(iptr==NULL)
       {
        printf("File not opened");
        return -1;
       }
       ind.iroll_no = stud.roll_no;
       ind.offset = offset;
       ind.flag = 1;
       fwrite(&ind,sizeof(ind),1,iptr);
       fclose(iptr);
       SORT_FILE();
       return 1;
 }

 /*
 the DELETE_RECORD function
 input:roll_no
 output:either -1 or 1
 called by:main
 calls:none
 */

 int DELETE_RECORD(int roll_no)

{
    is ind;
    int flag = 0;
    iptr = fopen(if_name,"rb+");
    if(iptr==NULL)
    {
        printf("File not opened");
        return -1;

    }
    while(fread(&ind,sizeof(is),1,iptr));
    {
    if(ind.iroll_no == roll_no)
       {
        flag = 1;
        break;
       }
    }

    if (flag == 1)
       {
        ind.flag = -1;
        fseek(iptr,-(long)sizeof(is),SEEK_CUR);
        fwrite(&ind,sizeof(is),1,iptr);
        fclose(iptr);
        return 1;
        }
        fclose(iptr);
        return -1;
 }

 /*
 The MODIFY_RECORD function
 Input:roll_no
 output:1
 called by:main
 calls:none
 */

 int MODIFY_RECORD(int roll_no)

{

    is ind;
    ss stud;
    int flag = 0;
    iptr = fopen(if_name,"rb+");
    if(iptr == NULL)
    {
        printf("File not opened ");
        return -1;
    }
    while(fread(&ind,sizeof(is),1,iptr))
    {
      if(ind.iroll_no == roll_no)
      {
        flag = 1;
        break;
      }
    }
    fclose(iptr);
    if(flag == 1)
    {
        ptr = fopen(f_name,"rb+");
        if(ptr == NULL)
        {
        printf("File not opened");
        return -1;
    }
    fseek(ptr,ind.offset,SEEK_SET);
    fread(&stud,sizeof(stud),1,ptr);

        printf("Enter the name of the student");
        fflush(stdin);
        scanf("%s",stud.name);
        printf("Enter the age of the student");
        fflush(stdin);
        scanf("%d",&stud.age);
        printf("Enter the marks of the student");
        fflush(stdin);
        scanf("%d",&stud.mark);
        fseek(ptr,-(long)sizeof(stud),SEEK_CUR);
        fwrite(&stud,sizeof(stud),1,ptr);
        fclose(ptr);
        return 1;
     }
        return -1;
  }


   /*
   The SEARCH_RECORD function
   input:roll_no
   output:if record foud then 1
   called by:main
   calls:none
   */


   int SEARCH_RECORD(int roll_no)

 {

    is ind;
    ss stud;
    iptr = fopen(if_name,"rb+");
    if(iptr == NULL)
    {
        printf("File not opened");
        return -1;
     }
     while(fread(&ind,sizeof(is),1,iptr))
     {
     if(ind.iroll_no == roll_no && ind.flag == 1)
       {
       fclose(iptr);
       return 1;
       }
     }
     fclose(iptr);
     return -1;

 }

 /*
 The DISPLAY_ALL_RECORD function
 input:none
 output:-1 if no other record otherwise 1
 called by:main
 calls:none
 */

 int DISPLAY_ALL_RECORD()

 {

    is ind;
    ss stud;
    iptr = fopen(if_name,"rb+");
    if(iptr == NULL)
     {
        printf("file not opened");
        return -1;
      }
      while(fread(&ind,sizeof(is),1,iptr))
      {
         if(ind.flag == 1)
         {
             fseek(ptr,ind.offset,SEEK_SET);
             fread(&stud,sizeof(stud),1,ptr);
             printf("\n\n\nRoll    : %d",stud.roll_no);
             printf("\nName      : %s",stud.name);
             printf("\nAge      : %d",stud.age);
             printf("\nMarks     : %d",stud.mark);
           }
        }
        fclose(iptr);
        fclose(ptr);
        return 1;
}
  /******************************************************************
                include.h
   ******************************************************************/

   typedef struct student

   {

    int roll_no;
    char name[20];
    int age;
    int mark;
    }ss;

    typedef struct index

   {

    int iroll_no;
    long offset;
    int flag;
   }is;

   FILE *ptr=NULL;
   FILE *iptr=NULL;
   char f_name[20];    //master file
   char if_name[20];   //index file

[danieldane]

Is there anybody there could help me about this function: #include"c:/includes.h".

[L7Sqr]

#include "C:/includes.h" will copy the text of the file C:\includes.h into your source file at that point. The #include mechanism is a way to do that. You can either specify the files between <> - where the file must reside in a well-known path, or between double-quotes where the fully qualified path to the file is provided.

[danieldane]

Thanks you very much. My concern is, when I try to run this sample program I got 25 errors and the error pointed on this prototype (#include<c:/includes.h>). This morning, I read an article that says, this is an special prototype. Is it true? Then could you show me how to make a customize/special prototype? I got this sample code from our library book which is basis to make my final project (Telephone Directory).

[WaltP]

You're going to have to contact the author of the code and get a copy of inputs.h from him. And that's not a prototype. It's an include file.

If the code really came out of the book, the include file is there, too.

[danieldane]

Ok thanks.