题解

#include<iostream>
using namespace std;
int main(){
    int a,b;
    char o;
    cin>>a>>b>>o;
    if(o=='/'&&b==0){
            cout<<"Divided by zero!"; 
        return 0;
    }else{
        if(o=='+'){
            cout<<a+b;
        }else if(o=='-'){
            cout<<a-b;
        }else if(o=='*'){
            cout<<a*b;
        }else if(o=='/'){
            cout<<a/b;
        }
        return 0;
    }
    if(o!='+'||'-'||'*'||'/'){
        cout<<"Invalid operator!";
        return 0;
    }
    return 0;
}