Program to sovle basic mathematical operation

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
 //Program to sovle basic mathematical operation
 int a,b,res;
 char z;
 cout<<"Enter the value of A =";
 cin>>a;
 cout<<"Enter the value of B =";
 cin>>b;
 cout<<"Enter the operation you want to perform like (+,-,*,/)";
 cin>>z;
 switch(z)
 {
  case '+':
  res=a+b;
  break;
  case '-':
  res=a-b;
  break;
  case '*':
  res=a*b;
  break;
  case '/':
  res=a/b;
  break;
  default:
  cout<<"please press any operator";
 }
 cout<<"The result is ="<<res;

getch();
    return 0;
 
}