#include<bits/stdc++.h> #define yy return 0; using namespace std; int main() { int a,b; char c; cin>>a>>b>>c; if(c=='+') cout<<a+b; else if(c=='-') cout<<a-b; else if(c=='') cout<<ab; else if(c=='/') { if(b==0) cout<<"Divided by zero!"; else cout<<a/b; } else cout<<"Invalid operator!"; yy }