if (GenericButton("div").clicked) {
	onOp((long a, long b) { return b == 0 ? 0 : a / b; });
}

if (GenericButton("mul").clicked) {
	onOp((long a, long b) { return a * b; });
}

if (GenericButton("add").clicked) {
	onOp((long a, long b) { return a + b; });
}

if (GenericButton("sub").clicked) {
	onOp((long a, long b) { return a - b; });
}