How variables are represented in memory

mem_to_bit.c

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

#define MEM_TO_BIN(obj) mem_to_bin((char[sizeof(obj) * 9 + 1]){""}, &(obj), sizeof(obj))

char *mem_to_bin(char *buffer, void *object, size_t sizeof_object) {
    const unsigned char *p = (const unsigned char *)object;
    p += sizeof_object;
    char *s = buffer;
    while (sizeof_object-- > 0) {
        unsigned bits_per_byte = 8;
        p--;
        while (bits_per_byte-- > 0)
            *s++ = ((*p >> bits_per_byte) & 1) + '0';
        *s++ = ' ';
    }
    *s = '\0';
    return buffer;
}

int main(void) {
    int i = 1;
    printf("[%20d]\n%s\n", i, MEM_TO_BIN(i));

    float f = 3.14;
    printf("[%20.5f]\n%s\n", f, MEM_TO_BIN(f));

    double d = 3.14;
    printf("[%20.5f]\n%s\n", d, MEM_TO_BIN(d));
    {
        char data[20] = "Hello World!!";
        printf("[%s]\n", data);
        for (int i = 0; i < sizeof(data); i++) {
            if(i % 5 == 0 && i) printf("\n");
            printf("%s", OBJ_TO_BIN(data[i]));
        }
        printf("\n");
    }
    {
        char data[4][5] = {"Go", "Good", "Hi!"};
        for(int i = 0; i < sizeof(data) / sizeof(data[0]); i++) {
            printf("[%s]\n", data[i]);
            for(int j = 0; j < sizeof(data[i]); j++) {
                if(j % 8 == 0 && j) printf("\n");
                printf("%s", OBJ_TO_BIN(data[i][j]));
            }
            printf("\n");
        }
    }
    return 0;
}

===========================================
OUTPUT
===========================================
[                   1]
00000000 00000000 00000000 00000001
[             3.14000]
01000000 01001000 11110101 11000011
[             3.14000]
01000000 00001001 00011110 10111000 01010001 11101011 10000101 00011111
[Hello World!!]
01001000 01100101 01101100 01101100 01101111
00100000 01010111 01101111 01110010 01101100
01100100 00100001 00100001 00000000 00000000
00000000 00000000 00000000 00000000 00000000
[Go]
01000111 01101111 00000000 00000000 00000000
[Good]
01000111 01101111 01101111 01100100 00000000
[Hi!]
01001000 01101001 00100001 00000000 00000000
[]
00000000 00000000 00000000 00000000 00000000