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Tic Tac Toe ending early

Steves (44)
Okay so a few problems. Problem one: the program declares a winner when there is a marker in the middle, corner, and another corner, though it is not three in a row. Problem 2: when you chose to play again on the first move of the second game it just asks if you want to play again, heres the code.

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#include <iostream>
#include <Windows.h>
#include <cstdlib>
using namespace std;
char slot[3][3]={'1','2','3','4','5','6','7','8','9'};
char *pointer[9]={&slot[0][0], &slot[0][1], &slot[0][2], &slot[1][0], &slot[1][1], &slot[1][2], &slot[2][0], &slot[2][1], &slot[2][2]};
char player_turn='2';
char X_or_O;
char Player_Move;
char restart_game;
int game_number=1;
bool valid_move=true;
bool game_over=false;
void print_board();
void Marker_Set();
void Switch_marker();

void Switch_marker()
{
	switch (player_turn)
	 {
	 case '1': player_turn='2';
		 break;
	 
	 case '2': player_turn='1';
		 break;
	 }
}
void print_board()
{
	cout<<slot[0][0]<<"   "<<slot[0][1]<<"   "<<slot[0][2]<<endl;
	cout<<slot[1][0]<<"   "<<slot[1][1]<<"   "<<slot[1][2]<<endl;
	cout<<slot[2][0]<<"   "<<slot[2][1]<<"   "<<slot[2][2]<<endl;
}
void Marker_Set()
{
	cout<<"player "<<player_turn<<"'s turn:   ";
	if (player_turn=='1')
		X_or_O='X';
	else 
	X_or_O='O';
}
int main()
{
	do
	{
	do
	{
	game_over==false;
		do
		{		
		print_board(); // function prints out the board
		Switch_marker(); //switches marker from X to O
		Marker_Set(); //sets player 1 to X and player two to O
		
		cin>>Player_Move; //input and checks to see if the move is valid or not
			if (Player_Move=='1' && slot[0][0]=='1')
				slot[0][0]=X_or_O;
			else if (Player_Move=='2' && slot[0][1]=='2')
				slot[0][1]=X_or_O;
			else if (Player_Move=='3'  && slot[0][2]=='3')
				slot[0][2]=X_or_O;
			else if (Player_Move=='4' && slot[1][0]=='4')
				slot[1][0]=X_or_O;
			else if (Player_Move=='5' && slot[1][1]=='5')
				slot[1][1]=X_or_O;
			else if (Player_Move=='6' && slot[1][2]=='6')
				slot[1][2]=X_or_O;
			else if (Player_Move=='7' && slot[2][0]=='7')
				slot[2][0]=X_or_O;
			else if (Player_Move=='8' && slot[2][1]=='8')
				slot[2][1]=X_or_O;
			else if (Player_Move=='9' && slot[2][2]=='9')
				slot[2][2]=X_or_O;
			else 
			{	cout<<"Invalid move, have another go."<<endl;
				valid_move=false; }
			}  
			while (valid_move==false); // repeat input and checks to see if its valid 


	 if (slot[0][0]==slot[0][1] && slot[0][2]==slot[0][1]) //checks to see if someone has won the game
		game_over=true;
	 if (slot[1][0]==slot[1][1] && slot[1][2]==slot[1][1]) 
		game_over=true;
	 if (slot[2][0]==slot[2][1] && slot[2][2]==slot[2][1])
		game_over=true;
	 if (slot[0][0]==slot[1][0] && slot[2][0]==slot[1][0])
		game_over=true;
	 if (slot[0][1]==slot[1][1] && slot[2][1]==slot[1][1])
		game_over=true;
	 if (slot[0][2]==slot[1][2] && slot[2][2]==slot[1][2])
		game_over=true;
	 if (slot[0][0]==slot[1][1] && slot[2][2]==slot[1][1])
		game_over=true;
	 if (slot[0][2]==slot[1][1] && slot[0][2]==slot[1][1])
		game_over=true;
	 	if (game_over==true)
			cout<<"player "<<player_turn<<" wins!!"<<endl;
	
		if (slot[0][0]!='1' && slot[0][1]!='2' && slot[0][2]!='3' 
		 && slot[1][0]!='4' && slot[1][1]!='5' && slot[1][2]!='6' &&
		 slot[2][0]!='7' && slot[2][1]!='8' && slot[2][2]!='9')
		 game_over==true;
	}
	while(game_over==false);
	print_board();
	cout<<"would you like to play again?"<<"y / n"<<endl;
	cin>>restart_game;
	if (restart_game=='y')
	{
		game_number+=1;
		cout<<"okay tic tac toe game number:  "<<game_number<<endl;
		if(player_turn=='1')
		player_turn++; 
	slot[0][0]='1';
	slot[0][1]='2';
	slot[0][2]='3';
	slot[1][0]='4';
	slot[1][1]='5';
	slot[1][2]='6';
	slot[2][0]='7';
	slot[2][1]='8';
	slot[2][2]='9';
		
	}
	else cout<<"okay goodbye, come back later";
	Sleep(1000);
	}
	while (restart_game=='y');
}
Last edited on
Hippogriff (727)
The reason it is choosing a winner incorrectly in certain cases is due to your last check for gameover on the game board.
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if (slot[0][2]==slot[1][1] && slot[0][2]==slot[1][1])
game_over=true;


It looks like you made a typo here (it is checking the same 2 squares twice)

As for it instantly asking you "if you want to play again" after you start a new game, that is because you are not setting game_over back to false after you start again, so the code always thinks the player has finished.

Finally it looks like your "tie" code isn't going to work, change the == to =. 
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if (slot[0][0]!='1' && slot[0][1]!='2' && slot[0][2]!='3' 
&& slot[1][0]!='4' && slot[1][1]!='5' && slot[1][2]!='6' &&
slot[2][0]!='7' && slot[2][1]!='8' && slot[2][2]!='9')
game_over==true;

bacia (23)
you could use
 
 
system("cls");

to clear the screen before reprinting the 3*3 grid
Steves (44)
Alright thanks a ton guys. didnt realize that typo either
Steves (44)
My cats game (tie) code still isnt working. Any ideas?

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if (slot[0][0]!='1' && slot[0][1]!='2' && slot[0][2]!='3' 
		 && slot[1][0]!='4' && slot[1][1]!='5' && slot[1][2]!='6' &&
		 slot[2][0]!='7' && slot[2][1]!='8' && slot[2][2]!='9')
		 game_over==true;
Last edited on
cire (8284)
game_over = true;
Steves (44)
Woo program tic tac toe complete thank you. But I'm wondering why its = and not == . anyone know?
Hippogriff (727)
= is to directly assign something to a variable. == is used to compare 2 different variables.

In this case, when there are no spaces left for players to pick, you want to set game_over to true, not compare it to true;
Steves (44)
Ah = is used to make something equal. == is used to see if conditions are true and compare things yea gotcha thanks bro.
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