/*
 * Program to display internal representation of floating-point number.
 */
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

void print_byte_as_binary(unsigned char c) {
    char one_byte[CHAR_BIT];
    for (int b = CHAR_BIT-1; b >= 0; --b) {
        one_byte[b] = (c & 1) ? '1' : '0';
        c = c >> 1;
    }
    for (int b = 0; b < CHAR_BIT; ++b) {
        putchar(one_byte[b]);
    }
}
void print_as_binary(void * memptr, int num_bytes) {
    unsigned char * p = (unsigned char *) memptr; 
    printf("in binary (low byte first):  ");
    for (int i = 0; i < num_bytes; ++i)
    {
        print_byte_as_binary((unsigned char) p[i]);
        putchar(' ');
    }
    putchar('\n');
    printf("in binary (high byte first):  ");
    for (int i = num_bytes-1; i >= 0; --i)
    {
        print_byte_as_binary((unsigned char) p[i]);
        putchar(' ');
    }
    putchar('\n');
}

int main(void) {

    float f;
    double d;
    int i;
    printf("enter a floating-point number:\n");
    if (scanf("%f", &f) != 1) {
        printf("error -- not numeric\n");
        return EXIT_FAILURE;
    }
    d=f;
    i=f;
    printf("float %f:\n", f);
    print_as_binary(&f, sizeof f);
    printf("double %f:\n", d);
    print_as_binary(&d, sizeof d);
    printf("integer %d:\n", i);
    print_as_binary(&i, sizeof i);
    return EXIT_SUCCESS;
}