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Showing content from https://en.wikibooks.org/wiki/C++_Programming/Code/Standard_C_Library/Functions/islower below:

C++ Programming/Code/Standard C Library/Functions/islower - Wikibooks, open books for an open world

islower[edit | edit source] Syntax
#include <cctype>
int islower( int ch );

The islower() function returns non-zero if its argument is a lowercase letter. Otherwise, zero is returned.

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isupper

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