/in/foo.cc: In function 'int main()':
/in/foo.cc:6:6: error: 's' was not declared in this scope
   if(s[0]=="R")cout << "Paper";
      ^
/in/foo.cc:7:6: error: 's' was not declared in this scope
   if(s[0]=="P")cout << "Scissors";
      ^
/in/foo.cc:8:6: error: 's' was not declared in this scope
   if(s[0]=="S")cout << "Rock";                        
      ^