题解 100% AC

#include<iostream>
using namespace std;
int main(){
	int a,b;
	char c;
	cin>>a>>b>>c;
	switch(c){
		case '+':
			cout<<a+b<<endl;
			break; 
		case '-':
			cout<<a-b<<endl;
			break;
		case '*':
			cout<<a*b<<endl;
			break;
		case '/':
			if(b==0){
				cout<<"Divided by zero!"<<endl;
			} 
			else{
				cout<<a/b<<endl;
			}
			break;
		default:
			cout<<"Invalid operator!"<<endl;
	}
	return 0;
}