How do you use Yes/No to input your answer C++?

Question

I have my program here.

#include <iostream>
#include <string>
using namespace std;
int main()
{
string input;
cout << "say yes or no" << endl;
cin >> input;
if(input == Yes)
{
    cout << "test" << endl;
}
else if(input == No)
{
    cout << "test123" << endl;
}
system("pause");
}

It says that Yes and No are undefined? Please help I am new to c++

Answer 1

You should use doubleQuotes for string "Yes" "No"

Answer 2

First, Yes and No without double quote are read as variable by the compilator, and you didn't declare any Yes or No variable.

Second, I don't think you can compare String like that in C++ : you have to use compare ( http://www.cplusplus.com/reference/string/string/compare/ ) so the prog will be :

#include <iostream>
#include <string>
using namespace std;
int main()
{
  string input;
  cout << "say yes or no" << endl;
  cin >> input;
  if(input.compare("Yes"))
  {
    cout << "test" << endl;
  }
  else if(input.compare("No"))
  {
    cout << "test123" << endl;
  }
  system("pause");
}