# Src/os/string.c, lines 70f

**URL:** <https://swi-prolog.discourse.group/t/src-os-string-c-lines-70f/9480>\
**Category:** Nice to know\
**Created:** [January 14, 2026, 8:27pm UTC](https://swi-prolog.discourse.group/t/src-os-string-c-lines-70f/9480 "2026-01-14T20:27:38Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![mgondan1](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/mgondan1/32/803_2.png) [@mgondan1](https://swi-prolog.discourse.group/u/mgondan1)\
**Post date:** [January 14, 2026, 8:27pm UTC](https://swi-prolog.discourse.group/t/src-os-string-c-lines-70f/9480/1 "2026-01-14T20:27:38Z")

</div>

I quote:

```prolog
/* Return the value of a digit when transforming a number of base 'b'.
    Return '-1' if it is an illegal digit.
 ** Fri Jun 10 10:46:40 1988 jan@swivax.UUCP (Jan Wielemaker) */
int
digitValue(int b, int c)

```

I was wondering if this email (?) address is still working 🙂