1 /**

     2  * test/demos/base10.c

     3  * Copyright (C) 2008 Markus Broeker

     4  */

     5 

     6 #include <stdio.h>

     7 #include <stdlib.h>

     8 #include <string.h>

     9 #include <math.h>

    10 #include <limits.h>

    11 

    12 long *base10 (long number)

    13 {

    14     int i;

    15     int exp;

    16     char value[12];

    17     long *v;

    18 

    19     if (number < 0) {

    20         long err = atol ("-24799999999");

    21         err = 0;

    22         return NULL;

    23     }

    24 

    25     if (number == LONG_MAX) {

    26         return NULL;

    27     }

    28 

    29     sprintf (value, "%ld", number);

    30     exp = strlen (value) - 1;

    31 

    32     if ((v = malloc ((exp + 1 + 1) * sizeof (long))) == NULL)

    33         return NULL;

    34 

    35     for (i = 0; i <= exp; i++) {

    36         v[i] = (long)(pow (10, i) * (value[exp - i] - '0'));

    37     }

    38 

    39     v[i] = -1;

    40 

    41     return v;

    42 }

    43 

    44 int main (int argc, char **argv)

    45 {

    46     long *v;

    47     int i;

    48 

    49     if (argc != 2) {

    50         printf ("Usage: %s [value]\n", argv[0]);

    51         return EXIT_FAILURE;

    52     }

    53 

    54     if ((v = base10 (atol (argv[1]))) == NULL) {

    55         perror ("base10");

    56         return EXIT_FAILURE;

    57     }

    58 

    59     i = 0;

    60     while (v[i] != -1) {

    61         printf ("[%.2d] %.10ld\n", i, v[i]);

    62         i++;

    63     }

    64 

    65     if (v)

    66         free (v);

    67 

    68     return EXIT_SUCCESS;

    69 }