Answer to Question #155335 in C for suchayana

Question

Write a program to take input for students (id, name, cgpa) until id is given zero, put those student info into a linked list or add those student info at the tail of linked list. After adding all those students, print all student info into a binary file. Create another program to read the entries again.

Answer 1

The first program for write

#include <stdio.h>
#include <stdlib.h>
struct student {
    char id[8];
    char name[20];
    float cgpa;
} s[1000];


int main() {
    int n;
    FILE *fptr;  // declaring a variable for binary file
    
    if ((fptr = fopen("program.bin","wb")) == NULL){
       printf("Error! opening file");


       // Program exits if the file pointer returns NULL.
       exit(1);
   }
    
    int i = 0;
    printf("Enter information of students:\n");
    
    //storing information
    while (1) {
        printf("For the %d - student: \n", i + 1);
        printf("Enter student id: ");
        scanf("%s", s[i].id);
        printf("Enter student name: ");
        scanf("%s", s[i].name);
        printf("Enter student cpga: ");
        scanf("%f", &s[i].cgpa);
        if (s[i].cgpa == 0) {
            break;
        }
        i++;
        printf("\n");
        fwrite(&s[i], sizeof(struct student), 1, fptr);
    }
    fclose(fptr);
}

A second program for reading a binary file

#include <stdio.h>
#include <stdlib.h>
struct student {
    char id[8];
    char name[20];
    float cgpa;
} s[1000];


int main() {
    int i = 0;
    int n;
    FILE *fptr;  // declaring a variable for binary file
    
    if ((fptr = fopen("program.bin","rb")) == NULL){
       printf("Error! opening file");


       // Program exits if the file pointer returns NULL.
       exit(1);
   }
   
   for (n = 0; n < 5; n++) {
       fread(&s[i], sizeof(struct student), 1, fptr);
       printf("For the %d - student: \n", i + 1);
       printf("Student id: %s\nStudent name: %ds\nStudent cgpa: %f", s[i].id, s[i].name, s[i].cgpa);
       i++;
   }
   fclose(fptr);
}