How do I solve this code error?

Question

#include <iostream>
using namespace std;
int main()
{
double a,b,c;
cout<< "Enter the values for a:";
cin >> a;
cout << "Enter the values for b:";
cin>> b;
int operation;
cout << "Enter the operation [+,-,* or /]:)";
cin >> operation;
switch(operation)
{
case '+': c = a+b;
break;
case '-': c = a-b;
break;
case '*': c = a*b;
break;
case '/': c = a/b;
break;
}
cout<< a << operation << b << "=" << c;
return 0;
}

Answer 1

int operation; --> char operation;