Integer (int) binary visualization fun

int_binary_visualization.c

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

char *int_binary_to_str( int const value );
void test_int( int const value );

int main( void )
{
    test_int( 5 );

    test_int( 0xF18 );

    return 0;
}

void test_int( int const value )
{
    char *bits_str;

    bits_str = int_binary_to_str( value );

    if( bits_str )
    {
        puts( "" );
        printf( "        int: %d\n", value );
        printf( "hexadecimal: %X\n", value );
        printf( "    binario: " );
        puts( int_binary_to_str( value ) );

        free( bits_str );
    }
}

char *int_binary_to_str( int const value )
{
    unsigned const BITS_ON_BYTE = 8;
    unsigned const bits_str_capacity = sizeof( int ) * BITS_ON_BYTE + 1;

    char *bits_str = malloc( sizeof( char ) * bits_str_capacity );

    bits_str[bits_str_capacity - 1] = '\0';

    unsigned int mask = 1;
    unsigned int test;

    for( int offset = bits_str_capacity - 2; offset >= 0; --offset )
    {
        test = value & mask;

        bits_str[offset] = test ? '1' : '0';
        mask <<= 1;
    }

    return bits_str;
}