Question

How to write int number to binary file in C

Answer 1

#include <stdio.h>
 
int main(void)
{
    int a, b, c;
    FILE *fp;

    fp = fopen("d:\\data.bin","wb");
    if (!fp)
    {
        printf("Unable to open file");
        return 1;
    }
    a = 100; 
    b = 200;
    c = 300;
    fwrite(&a, sizeof(int), 1, fp);
    fwrite(&b, sizeof(int), 1, fp);
    fwrite(&c, sizeof(int), 1, fp);
    
    fclose(fp);
 
    return 0;
}

/*
run: (the content of d:\\date.bin)
 
d   È   ,  

*/

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