uisdigit - Tells if a character is a digit. Allegro game programming library.

       Returns nonzero if `c' is a digit.

          for (counter = 0; counter < ustrlen(text_string); counter++) {
             if (uisdigit(ugetat(text_string, counter)))
                usetat(text_string, counter, '*');
          }

       uisdigit - Tells if a character is a digit. Allegro game programming library.

uisspace(3alleg4), ugetc(3alleg4), usetc(3alleg4), uwidth(3alleg4), ucwidth(3alleg4), uisok(3alleg4)

Allegro                                           version 4.4.3                                uisdigit(3alleg4)

#include<allegro.h>intuisdigit(intc);