stop_light.cpp

#include <iostream>
using namespace std; 

int main() {
  string light; 
  cout << "What is the traffic light color?" <<endl;
  cin >> light; 

  if(light == "green"){
    cout << "Go!" <<endl; 
  }
  else if(light == "yellow"){
    cout << "Slow down!" <<endl; 
  }
  else if(light == "red"){
    cout << "Stop!" << endl; 
  }
  else{
    cout << "invalid entry" << endl;
  }

}