#include<bits/stdc++.h> using namespace std; int main() { int a,b,n; char ch; cin>>a>>b>>ch; if(ch=='/'&&b==0){ cout<<"Divided by zero!"; } switch(ch) { case '+':n=a+b; case '-':n=a-b; case '*':n=a*b; case '/':n=a/b; default:cout<<"lnvalid operator!"; } cout<<n; return 0; }