Question

How to write a struct to a binary file in C

Answer 1

// A c program that write a struct to a binary file 
 
#include <stdio.h>
  
struct Numbers
{
   int n1, n2;
};
 
int main(void)
{
    struct Numbers N;
    FILE *fp;
 
    if ((fp = fopen("d:\\data.bin", "wb")) == NULL)
    {
        printf("Error open file");
        return 1;
    }
 
    for  (int i = 1; i <= 3; i++)
    {
        N.n1 = i;
        N.n2 = i + 1;
        fwrite(&N, sizeof(struct Numbers), 1, fp); 
    }
     
    fclose(fp); 
  
    return 0;
}
 
   
/*
run:
   
            
 
*/

 

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