---
name: "uisdigit"
section: "3alleg4"
platform: "linux"
package: "allegro4-doc"
version: "2:4.4.3.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/uisdigit/3alleg4"
---

# uisdigit(3alleg4)

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

## NAME

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

## SYNOPSIS

**#include \<allegro.h\>**

**int uisdigit(int c);**

## DESCRIPTION

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, '*');
   }
```

## SEE ALSO

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