多多思考不做无用功

#include<bits/stdc++.h>

using namespace std;

int main(){
	double x, y;
	char a;
	cin >> x >> y >> a;
	
	if(a == '+'){
		cout << x + y;
	}
	else if(a == '-'){
		cout << x - y;
	}
	else if(a == '*'){
		cout << x * y;
	}
	else if(a == '/'){
		if(y == 0) cout<< "Divided by zero!";
		else cout << x / y;
	}
	else cout << "Invalid operator!";

    return 0;
}