Thread: menu driven program using file

Hi!
i am told to write a program using file,nd structures that contain student database usin add,modify,search,display functions.
i wrote add function but unable to write modify,serach,display.plz help its urgent
insert

Code:

#include<stdio.h>
struct student3
 {
  int age;
  int marks;
  char name[11];
 int roll;
  };
  add();
main()
 {
   add();
  } 
  
  
  add()
   {
    FILE *fp;
    int i,n;
    struct student3 s[100];
    printf("enter no. of students");
    scanf("%d",&n);
    printf("name,roll,marks,age");
    for(i=0;i<n;i++)
    scanf("%s %d %d %d",s[i].name,&s[i].roll,&s[i].marks,&s[i].age);
    fp=fopen("student4.dat","w");
    fwrite(s,sizeof(struct student3),n,fp);
    fclose(fp);
   }

At first, a typical main structure is like this

Code:

int main(void)
{
     ....
     return 0;
}

For the display , use fread function, to fetch data from the file into a buffer and then print them with printf.
An alternative solution would be to use fprintf to print directly from the file.The first approach is more simple in my mind.

An alternative solution would be to use fprintf to print directly from the file

No, fprintf will write formatted output to a file, not from a file. Printing from a file describes something that the C standard library doesn't really provide in a single function.

Originally Posted by whiteflags

No, fprintf will write formatted output to a file, not from a file. Printing from a file describes something that the C standard library doesn't really provide in a single function.

Correct.My mistake