assignment 2

tictactoe.cpp

#include <iostream>
#include <cstdio>
#include <fstream>

using namespace std;

#define INVALID "i"
#define WIN_X "x"
#define WIN_O "o"
#define TIE "t"
#define CONTINUES "c"

bool have_won(string s, char c){
  if (s[0] == c && s[1] == c && s[2] == c) return true;
  if (s[3] == c && s[4] == c && s[5] == c) return true;
  if (s[6] == c && s[7] == c && s[8] == c) return true;

  if (s[0] == c && s[3] == c && s[6] == c) return true;
  if (s[1] == c && s[4] == c && s[7] == c) return true;
  if (s[2] == c && s[5] == c && s[8] == c) return true;

  if (s[0] == c && s[4] == c && s[8] == c) return true;
  if (s[2] == c && s[4] == c && s[6] == c) return true;

  return false;
}

string proceed(string s){
  if (s.length() != 9) return INVALID;

  for (int i=0;i<9;++i)
    if (s[i] != 'x' && s[i] != 'o' && s[i] != '#')
      return INVALID;

  // checks for number of x-es and o-s
  // it is impossible that abs(x - o) > 1

  int x_count = 0;
  int o_count = 0;
  int sharp_count = 0;

  for (int i=0;i<9;++i){
    if (s[i] == 'x') x_count++;
    if (s[i] == 'o') o_count++;
    if (s[i] == '#') sharp_count++;
  }

  if (abs(x_count - o_count) > 1) return INVALID;

  // checks for winners

  bool x_win = have_won(s, 'x');
  bool o_win = have_won(s, 'o');

  if (x_win && o_win) return INVALID;

  if (x_win) return WIN_X;
  if (o_win) return WIN_O;

  if (sharp_count == 0) return TIE;

  return CONTINUES;
}

int main(){
  freopen("tttstatus.txt", "w", stdout);

  ifstream in_file("tictactoeboards.txt");

  if (in_file.good())
  {

    string s;

    while (getline(in_file, s)){
      cout<<proceed(s)<<endl;
    }

    return 0;
  }

  return -1;
}