1 /**

     2  * getbits.c

     3  * Copyright (C) 2010 Markus Broeker

     4  *

     5  */

     6 #include <stdio.h>

     7 #include <limits.h>

     8 #include <string.h>

     9 

    10 #define BITS 64

    11 

    12 char *getbits (unsigned long long what)

    13 {

    14     static char byte[BITS + 1];

    15 

    16     short i = BITS;

    17 

    18     memset (byte, '0', BITS);

    19 

    20     while (what > 0) {

    21         byte[--i] = (what % 2) ? '1' : '0';

    22         what >>= 1;

    23     }

    24     byte[BITS] = '\0';

    25 

    26     return byte;

    27 }

    28 

    29 int main (void)

    30 {

    31     unsigned int i;

    32     for (i = 1; i < 16; i++)

    33         printf ("%s\n", getbits (i));

    34 

    35     printf ("%s\n", getbits (USHRT_MAX));

    36     printf ("%s\n", getbits (UINT_MAX));

    37     printf ("%s\n", getbits (ULONG_MAX));

    38 

    39 #ifdef ULLONG_MAX

    40     printf ("%s\n", getbits (ULLONG_MAX));

    41 #endif

    42 

    43     return 0;

    44 }