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## 3.201 tolower

> Function

>   Convert a character into its lower case representation.

> Header

>   `ctype.h`

> Declaration

>   `int __fastcall__ tolower (int c);`

> Description

>   The function returns the given character converted to lower case. If the given character is not a letter, it is returned unchanged.

> Limits

>   - The function is only available as fastcall function, so it may only be used in presence of a prototype.
> Availability

>   ISO 9899

> See also

>   islower, isupper, toupper

> Example

>   None.

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