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# strtoupper

strtoupper -- Make a string uppercase

## Description

`string strtoupper`(string string);

Returns `string` with all alphabetic characters converted to uppercase.

Note that 'alphabetic' is determined by the current locale. For instance, in the default "C" locale characters such as umlaut-a (ä) will not be converted.

See also strtolower() and ucfirst().

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