C Reference Lower Case Letter Test: islower()

The islower() function returns a non-zero if its argument is a lowercase letter. If the argument is not a lowercase letter, then zero is returned.

islower() source code example:


int main()
	char a;

	scanf( "%c", &a );
	if( islower(a) )
		printf( "Is lower case: %c\n", a );
		printf( "Is NOT lower case: %c\n", a );
	return 0;

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