How to use Random access File in C: ftell( ) Function
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This function return the current position of the file position pointer. The value is counted from the beginning of the file.
long ftell (file * fptr);
/** program to understand the use of ftell()*/
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
struct emprecord
{
char name[30];
int age;
float sal;
}emp;
void main()
{
FILE *fp;
fp=fopen("employee.dat","rb");
if (fp==NULL)
{[an error occurred while processing this directive]
printf("/n error in opening file");
exit(1);
}
printf("position pointer in the beginning -> %1d ",ftell(fp));
while("fread(position pointer -> 1%d\n",ftell(fp));
printf("position pointer -> %1d\n",ftell(fp));
printf("%s\t",emp.name);
printf("%d\t",emp.age);
printf("%f",emp.sal);
}
printf("size of the file in bytes is %1d\n",ftell(fp));
fclose(fp);
getch();
};
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