/* Program to show correct storage of floating data by binary i-o */
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
main() {
    float d, e;  FILE *f;
    d = sqrt(2.0);

    f = fopen("tempfile.dat", "wb");    /* NB: "wb" means "write binary" */
    fwrite(&d, sizeof(float), 1, f);    /* Write from d, 1 item the size of
                                           a float to file f */
    fclose(f);

    f = fopen("tempfile.dat", "rb");    /* NB: "rb" means "read binary" */
    fread(&e, sizeof(float), 1, f);     /* Read into e, 1 item the size of
                                           a float from file f */
    fclose(f);

    printf("%f is ", d);
    if (d != e) {
        printf("NOT ");
    }
    printf("equal to %f\n", e);
    return 0;
}