help with (error ISO c++ forbids comparison between pointers and integers

[Josh Henry]

heres the code writing it for a rock papers scissors game cannot
figure out whats wrong its suppose to be a user vs computer program
that uses a random number generator to make the comp selection and
then output the winner and each of the user and comp choice in char
not (0,1,2)???




#include <iostream>
using namespace std;

#include <ctime>
#include <cstdlib>

char usersMove()
{

  char user = 'Q';
  do
  {
    cout << "Welcome to the game of Rock, Paper, Scissors." << endl;
    cout << "Please chose your weapon: [R for rock, P for paper, S for
scissors, and Q to quit]: " << endl;
    cin >> user;
    cin.ignore(1000, 10);

    if (user == 'R' || user == 'r' || user == 'P' || user == 'p' ||
user == 'S' || user == 's');
    if (user == 'Q' || user == 'q') break;

    {
      return tolower(user);
    }
   }

     while (true);
     }
       char comp()

     {

       int compChoice = rand() % 3;
       if (compChoice == 0) return 'r';
       else if (compChoice == 1) return 'p';

       return 's';
     }

       int whoWins(char userPick,char compPick)
       {
         if (userPick == 'R' || userPick == 'r')
         {
           if (compPick == 'R' || compPick == 'r')
           return 2;

           else if (compPick == 'P' || compPick == 'p')
           return 1;
           else
           return 0;
         }

           else if (userPick == 'P' || userPick == 'p')
           {

             if (compPick == 'P' || compPick == 'p')
             return 2;

             else if (compPick == 'S' || compPick == 's')
             return 1;
             else
             return 0;
         }

           else if (userPick == 'S' || userPick =='s')
           {

             if (compPick == 'S' || compPick == 's')
             return 2;

             else if (compPick == 'R' || compPick == 'r')
             return 1;
             else
             return 0;
           }

           return 0;
           }

  int main()
  {
    srand(time(0));

    char user, ai;
    int winner;

    user = usersMove();
    ai = comp();

    cout << "The computer chose " << ai;
    winner = whoWins(user, ai);

    if (whoWins == 0)
      cout << "You win!";

    else if (whoWins == 1)
      cout << "You lost.. ";

    else
      cout << "You tied";


    return 0;

}