//
//  writing_a_binary_file.c
//  
//
//  Created by Bibhas Ghoshal on 11/08/20.
//

#include <stdio.h>
#include <stdlib.h>

struct threeNum
{
    int n1, n2, n3;
};

int main()
{
    int n;
    struct threeNum num;
    FILE *fptr;
    
    if ((fptr = fopen("./my_program.bin","wb")) == NULL){
        printf("Error! opening file");
        
        // Program exits if the file pointer returns NULL.
        exit(1);
    }
    
    for(n = 1; n < 5; ++n)
    {
        num.n1 = n;
        num.n2 = 5*n;
        num.n3 = 5*n + 1;
        fwrite(&num, sizeof(struct threeNum), 1, fptr);
    }
    fclose(fptr);
    
    return 0;
}