C Reference Hexidecimal Digit Test: isxdigit()

The function isxdigit() returns a non-zero if its argument is a hexadecimal digit. (If the argument is a: a-f, A-F, or 0-9).
If the argument is not a hexadecimal digit, then zero is returned.

isxdigit() source code example:


int main()
	char a;
	scanf( "%c", &a );
	if( isxdigit(a) )
		printf( "Is a hexadecimal digit : %c\n", a );
		printf( "This is NOT a hexadecimal digit: %c\n", a );
	return 0;

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