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## 3.206 ultoa

> Function

>   Convert an unsigned long integer into a string.

> Header

>   `stdlib.h`

> Declaration

>   `char* __fastcall__ ultoa (unsigned long val, char* buf, int radix);`

> Description

>   `itoa` converts the unsigned long integer `val` into a string using `radix` as the base.

> Limits

>   - There are no provisions to prevent a buffer overflow.
>   - The function is non standard, so it is not available in strict ANSI mode. You should probably use `sprintf` instead.
>   - The function is only available as fastcall function, so it may only be used in presence of a prototype.
> Availability

>   cc65

> See also

>   atoi, atol, itoa, ltoa, utoa

> Example

>   None.

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