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Tic-Tac-Toe Input Validation

zanderlx (2)
Hello. This is my first time posting on this website and I would like some help with C++ Programming. I am a beginner programmer and I need more practice. Please look over the code below. I need help with the input validation if the user inputs a letter. As of now, the code loops infinitely if I type something other than 1 or 2.

#include <iostream>
using namespace std;

char space[10] = { 'o','1','2','3','4','5','6','7','8','9' };

int status();
void board();
int gameplay();
int reset();

int main()
{
int again;
do
{
gameplay();
again = reset();
} while (again == 1);

return 0;
}

// Function to check the status of the game if Player has won, or a draw has been met

int status()
{
if (space[1] == space[2] && space[2] == space[3])

return 1;
else if (space[4] == space[5] && space[5] == space[6])

return 1;
else if (space[7] == space[8] && space[8] == space[9])

return 1;
else if (space[1] == space[4] && space[4] == space[7])

return 1;
else if (space[2] == space[5] && space[5] == space[8])

return 1;
else if (space[3] == space[6] && space[6] == space[9])

return 1;
else if (space[1] == space[5] && space[5] == space[9])

return 1;
else if (space[3] == space[5] && space[5] == space[7])

return 1;
else if (space[1] != '1' && space[2] != '2' && space[3] != '3'
&& space[4] != '4' && space[5] != '5' && space[6] != '6'
&& space[7] != '7' && space[8] != '8' && space[9] != '9')

return 0;
else
return -1;
}


// Function that creates the Tic-Tac-Toe Board

void board()
{
system("cls");

cout << " | | " << endl;
cout << " " << space[1] << " | " << space[2] << " | " << space[3] << endl;

cout << "_____|_____|_____" << endl;
cout << " | | " << endl;

cout << " " << space[4] << " | " << space[5] << " | " << space[6] << endl;

cout << "_____|_____|_____" << endl;
cout << " | | " << endl;

cout << " " << space[7] << " | " << space[8] << " | " << space[9] << endl;

cout << " | | " << endl << endl;
}

int gameplay()
{
int player = 1, determinant, choice;

char selection;
do
{
board();
if ((player = (player % 2)))
player = 1;
else
player = 2;

cout << "Player " << player << ", enter a number: ";
cin >> choice;

if ((selection = (player == 1)))
selection = 'X';
else
selection = 'O';

if (choice == 1 && space[1] == '1')

space[1] = selection;
else if (choice == 2 && space[2] == '2')

space[2] = selection;
else if (choice == 3 && space[3] == '3')

space[3] = selection;
else if (choice == 4 && space[4] == '4')

space[4] = selection;
else if (choice == 5 && space[5] == '5')

space[5] = selection;
else if (choice == 6 && space[6] == '6')

space[6] = selection;
else if (choice == 7 && space[7] == '7')

space[7] = selection;
else if (choice == 8 && space[8] == '8')

space[8] = selection;
else if (choice == 9 && space[9] == '9')

space[9] = selection;
else
{
cout << "The space selected is an invalid move, please press ENTER and select again.";

player--;
cin.ignore();
cin.get();
}
determinant = status();

player++;
} while (determinant == -1);
board();
if (determinant == 1)

cout << "==>\aPlayer " << --player << " is victorious! ";
else
cout << "==>\aGame draw";

cin.ignore();
cin.get();
return 0;
}

// Function to ask User(s) for another game and reset board
int reset()
{
int again;
cout << "Do you wish to play another game? (1 for Yes, 2 for No)" << endl;
cin >> again;
space[0] = { 'o' };
space[1] = { '1' };
space[2] = { '2' };
space[3] = { '3' };
space[4] = { '4' };
space[5] = { '5' };
space[6] = { '6' };
space[7] = { '7' };
space[8] = { '8' };
space[9] = { '9' };

//Input Validation for letters and numbers
while (again < 1 || again > 2)
{
cout << "Invalid! Please enter 1 or 2." << endl;
cin >> again;
}

return again;
}
Hirokachi (126)
The reason why you will infinitely loop when you type anything other than 1 or 2 is because of the following code:
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while (again < 1 || again > 2)
{
cout << "Invalid! Please enter 1 or 2." << endl;
cin >> again;
}


other than that I am not sure what you are talking about.

Please also make sure you use the tags code /code with square brakets ([) when you type code into this forum.

-Hirokachi
closed account (48T7M4Gy)
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#include <iostream>
using namespace std;

char space[10] = { 'o','1','2','3','4','5','6','7','8','9' };

int status();
void board();
int gameplay();
int reset();

int main()
{
int again;
do
{
gameplay();
again = reset();
} while (again == 1);

return 0;
}

// Function to check the status of the game if Player has won, or a draw has been met

int status()
{
if (space[1] == space[2] && space[2] == space[3])

return 1;
else if (space[4] == space[5] && space[5] == space[6])

return 1;
else if (space[7] == space[8] && space[8] == space[9])

return 1;
else if (space[1] == space[4] && space[4] == space[7])

return 1;
else if (space[2] == space[5] && space[5] == space[8])

return 1;
else if (space[3] == space[6] && space[6] == space[9])

return 1;
else if (space[1] == space[5] && space[5] == space[9])

return 1;
else if (space[3] == space[5] && space[5] == space[7])

return 1;
else if (space[1] != '1' && space[2] != '2' && space[3] != '3'
&& space[4] != '4' && space[5] != '5' && space[6] != '6'
&& space[7] != '7' && space[8] != '8' && space[9] != '9')

return 0;
else
return -1;
}


// Function that creates the Tic-Tac-Toe Board

void board()
{
system("cls");

cout << " | | " << endl;
cout << " " << space[1] << " | " << space[2] << " | " << space[3] << endl;

cout << "_____|_____|_____" << endl;
cout << " | | " << endl;

cout << " " << space[4] << " | " << space[5] << " | " << space[6] << endl;

cout << "_____|_____|_____" << endl;
cout << " | | " << endl;

cout << " " << space[7] << " | " << space[8] << " | " << space[9] << endl;

cout << " | | " << endl << endl;
}

int gameplay()
{
int player = 1, determinant, choice;

char selection;
do
{
board();
if ((player = (player % 2)))
player = 1;
else
player = 2;

cout << "Player " << player << ", enter a number: ";
cin >> choice;

if ((selection = (player == 1)))
selection = 'X';
else
selection = 'O';

if (choice == 1 && space[1] == '1')

space[1] = selection;
else if (choice == 2 && space[2] == '2')

space[2] = selection;
else if (choice == 3 && space[3] == '3')

space[3] = selection;
else if (choice == 4 && space[4] == '4')

space[4] = selection;
else if (choice == 5 && space[5] == '5')

space[5] = selection;
else if (choice == 6 && space[6] == '6')

space[6] = selection;
else if (choice == 7 && space[7] == '7')

space[7] = selection;
else if (choice == 8 && space[8] == '8')

space[8] = selection;
else if (choice == 9 && space[9] == '9')

space[9] = selection;
else
{
cout << "The space selected is an invalid move, please press ENTER and select again.";

player--;
cin.ignore();
cin.get();
}
determinant = status();

player++;
} while (determinant == -1);
board();
if (determinant == 1)

cout << "==>\aPlayer " << --player << " is victorious! ";
else
cout << "==>\aGame draw";

cin.ignore();
cin.get();
return 0;
}

// Function to ask User(s) for another game and reset board
int reset()
{
int again;
cout << "Do you wish to play another game? (1 for Yes, 2 for No)" << endl;
cin >> again;
space[0] = { 'o' };
space[1] = { '1' };
space[2] = { '2' };
space[3] = { '3' };
space[4] = { '4' };
space[5] = { '5' };
space[6] = { '6' };
space[7] = { '7' };
space[8] = { '8' };
space[9] = { '9' };

//Input Validation for letters and numbers
while (again < 1 || again > 2)
{
cout << "Invalid! Please enter 1 or 2." << endl;
cin >> again;
}

return again;
}
crazyjoshua27 (32)
I have one for you against a computer. I will post it
crazyjoshua27 (32)
Also has time functions in it......
crazyjoshua27 (32)
Sorry, but I can not post it.
will send link
crazyjoshua27 (32)
Link is. http://www.programgames.com/page4.html
download forth edition
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