Make you own basic calculator in C++ beginner level

#include <iostream>
using namespace std;

int multiply(int x, int y) { return x*y; }
int divide(int x, int y) {return x/y;}
int add(int x, int y) { return x+y; }
int subtract(int x, int y) {return x-y;}

int main(){
char op='c';
int x, y;

 while(op!='e'){
    cout<<"What operation would you like to perform: add(+), subtract(-), divide(/), multiply(*), [e]xit?"; 
    cin>>op; 
    switch(op) {
     case '+': 
        cin>>x;
        cin>>y;
        cout<<x<<"+"<<y<<"="<<add(x, y)<<endl; 
     break; 
     case '-':
        cin>>x;
        cin>>y;
        cout<<x<<"-"<<y<<"="<<subtract(x, y)<<endl; 
     break;
     case '/': 
        cin>>x; 
        cin>>y;
        cout<<x<<"/"<<y<<"="<<divide(x, y)<<endl; 
     break;
     case '*':
        cin>>x; 
        cin>>y; 
        cout<<x<<"*"<<y<<"="<<multiply(x, y)<<endl;
     break;
     case 'e':
        return 0; 
        default:
        cout<<"Sorry, try again"<<endl; 
    }//end swich-case
 }//end while
 
return 0;
}//end main