This isn't necessarily going to answer your question, but whether or not they are supported has nothing to do with GCC. These are functions that would be in the C library, which is a system library rather than a compiler library. So, whether or not they are supported will depend on whether or not your C library supports them. And whether or not there are good alternatives will also depend on your C library. What platform are you trying to build on? Thanks, Lyle Taylor -----Original Message----- From: Aaron Case [mailto:aaron.case@xxxxxxxxxxxx] Sent: Friday, September 12, 2003 11:30 AM To: gcc-help@xxxxxxxxxxx Subject: ltoa, itoa, ultoa in gcc Hello, I am porting code from Microsoft C v5.1 that is not exactly ANSI standard. I thought that ltoa, itoa, and ultoa were standard but I see now that they are NOT ANSI standard. Do have to write these functions myself or is there something supported by GCC that will suffice?? Thanks in Advance Aaron Case