Three macros for printing the bit representation of a fixed-point value

printBitRepresentation.h

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

/* prints each character representation of the byte one at a time.
 * no memory management required; slower, than using a buffer.
 */
#define printBitRepresentationEach(a)                        \
    ({                                                       \
        for (size_t _i = (sizeof(a) * CHAR_BIT); _i; _i--) { \
            putchar((a & (1 << (_i - 1))) ? '1' : '0');      \
        }                                                    \
        putchar('\n');                                       \
    })

/* prints a stack-buffer of characters.
 * fast, but can go through stack memory quickly.
 */
#define printBitRepresentationBuff(a)                         \
    ({                                                        \
        size_t _i = sizeof(a) * CHAR_BIT;                     \
        char _buff[_i + 1];                                   \
        char *_buff_p = _buff;                                \
        for (; _i; _i--) {                                    \
            *(_buff_p++) = (a & (1 << (_i - 1))) ? '1' : '0'; \
        }                                                     \
        *_buff_p = '\0';                                      \
        puts(_buff);                                          \
    })

/* prints a heap-buffer of characters.
 * very tight memory management. malloc is not optimal for all uses
 */
#define printBitRepresentationAlloc(a)                        \
    ({                                                        \
        size_t _i = sizeof(a) * CHAR_BIT;                     \
        char *_buff = malloc(_i + 1);                         \
        char *_buff_p = _buff;                                \
        for (; _i; _i--) {                                    \
            *(_buff_p++) = (a & (1 << (_i - 1))) ? '1' : '0'; \
        }                                                     \
        *_buff_p = '\0';                                      \
        puts(_buff);                                          \
        free(_buff);                                          \
    })