C Reference Upper case letter test: isupper()

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

isupper() source code example:


int main()
	char a;
	scanf( "%c", &a );
	if( isupper(a) )
		printf( "This is an uppercase letter: %c\n", a );
		printf( "This is NOT an uppercase letter: %c\n", a );
	return 0;

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