Codecademy export

functions.cpp

#include <iostream>

#include "functions.hpp"

void introduction() {
  std::cout << "\n==============\nWelcome to the Tic-Tac-Toe game!\n==============\n";
  std::cout << "In this game, you will play a paper-and-pencil game for two players (represented by the X and O letter) in a 3x3 grid. The first to place their marks in a vertical/horizontal/diagonal row wins the game.\n==============\n";
}

void end_game(char mark) {
  std::cout << "\nWhoohoo! Player with the" << mark << " symbol has won the game! Congratulations!\n";
}

void show_table(char positions[9]) {
  std::cout << "\n=========\n";
  std::cout << positions[0] " | " << positions[1] << " | " << positions[2] << "\n";
  std::cout << "__ ___ __\n";
  std::cout << positions[3] << " | " << positions[4] << " | " << positions[5] << "\n";
  std::cout << "__ ___ __\n";
  std::cout << positions[6] << " | " << positions[7] << " | " << positions[8] << "\n";
  std::cout << "=========\n";
}

void choose_mark(int move, char &mark) {
  if((move%2) == 0) mark = "O";
  else mark = "X";
}

void choose_position(char positions[9], char mark, int &move) {
  int number;
  std::cout << "\n==========\nWhich positions do you want to choose?\nValid positions are: \n";
  for(int i = 0; i <= 8; i++) {
    if(positions[i] == ' ') {
      std::cout << i+1 << " - ";
    }
  }
  std::cout << "\nYour position is: ";
  std::cin >> number;
  while(positions[number-1] != ' ') {
    std::cout << "Invalid position! Please choose again.\nYour position is: ";
    std::cin >> number;
  }
  if(positions[number-1] == ' ')   {
    positions[number-1] = mark;
    move++;
    choose_mark(move, mark);
  }
}

bool win_condition(char positions[9], char &mark) {
  
  bool win = false;
  
  // Horizontal directions
  if((positions[0]==positions[1]) && (positions[1]==positions[2])) {
    mark = positions[0];
    win = true;
  }
  if((positions[3]==positions[4]) && (positions[4]==positions[5])) {
    mark = positions[3];
    win = true;
  }
  if((positions[6]==positions[7]) && (positions[7]==positions[8])) {
    mark = positions[6];
    win = true;
  }
  // Vertical directions
  if((positions[0]==positions[3]) && (positions[3]==positions[6])) {
    mark = positions[0];
    win = true;
  }
  if((positions[1]==positions[4]) && (positions[4]==positions[7])) {
    mark = positions[1];
    win = true;
  }
  if((positions[2]==positions[5]) && (positions[5]==positions[8])) {
    mark = positions[2];
    win = true;
  }
  // Diagonal directions
  if((positions[0]==positions[4]) && (positions[4]==positions[8])) {
    mark = positions[0];
    win = true;
  }
  if((positions[2]==positions[4]) && (positions[4]==positions[7])) {
    mark = positions[2];
    win = true
  }
  return win;
}

functions.hpp

void introduction();
void end_game(char mark);
void show_table(char positions[9]);
void choose_position(char positions[9], char mark, int &move);
void choose_mark(int move, char &mark);
bool win_condition(char positions[9], char &mark);

ttt.cpp

#include <iostream>

#include "functions.hpp"

int main() {
  
  int move = 0;
  char mark;
  char positions[9] = {" ", " ", " ", " ", " ", " ", " ", " ", " "};

  introduction();
  show_table(positions);
  while(win_condition(positions[9], mark) != true) {
    choose_position(positions, mark, move);
    show_table(positions);
    win_condition(positions, mark);
  }
  end_game(mark);
  
}