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sir24 (4)
How can i make this player vs computer? C++ please help?

HI, I'm in high school and making a tic tac toe problem player vs computer. I already have player vs player can you please change it to player vs computer thanks for the help.

here is the code

#include <iostream>
using namespace std;

char square[10] = {'o','1','2','3','4','5','6','7','8','9'…

int checkwin();
void board();

int main()
{
int player = 1,i,choice;
char ch='y';
char mark;
do
{
board();
player=(player%2)?1:2;

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

mark=(player == 1) ? 'X' : 'O';

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

square[1] = mark;
else if (choice == 2 && square[2] == '2')

square[2] = mark;
else if (choice == 3 && square[3] == '3')

square[3] = mark;
else if (choice == 4 && square[4] == '4')

square[4] = mark;
else if (choice == 5 && square[5] == '5')

square[5] = mark;
else if (choice == 6 && square[6] == '6')

square[6] = mark;
else if (choice == 7 && square[7] == '7')

square[7] = mark;
else if (choice == 8 && square[8] == '8')

square[8] = mark;
else if (choice == 9 && square[9] == '9')

square[9] = mark;
else
{
cout<<"Invalid move, Press Enter and Try Again ";

player--;
cin.ignore();
cin.get();
}
i=checkwin();

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

cout<<"==>\aPlayer "<<--player<<" win ";
else
cout<<"==>\aGame draw";

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

int checkwin()
{
if (square[1] == square[2] && square[2] == square[3])

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

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

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

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

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

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

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

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

return 0;
else
return -1;

}

void board()
{
system("cls");
cout << "\n\n\tTic Tac Toe\n\n";

cout << "Player 1 (X) - Computer (O)" << endl << endl;
cout << endl;

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

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

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

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

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

cout << " | | " << endl << endl;
}
cnoeval (643)
Double Post: http://cplusplus.com/forum/beginner/88482/

Besides, you've already been answered here.: http://cplusplus.com/forum/general/85257/

You need to code the logic of Tic Tac Toe to simulate a computer playing like a human would. Post what you have tried...

AND USE CODE TAGS! (Select your code and press the <> button).
Last edited on
Imadatobanisa (647)
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#include <iostream>
#include <time.h>
using namespace std;
char square[10] = {'o','1','2','3','4','5','6','7','8','9'};

int checkwin();
void board();

#define X 1
#define Y 0

bool SetItem(int nPosition, int mark){
if(square[nPosition] != nPosition + '0' || nPosition < 1 || nPosition > 9)return false;
square[nPosition] = mark;return true;}

bool IsEmpty(int nPosition){return (square[nPosition] == '0' + nIndex);}
bool IsPlayer(bool Player, int nPosition){return (square[nPosition] == ((Player == X) ? 'X' : 'O'));}

int ThinkColumn(bool Player, int nColumn){nColumn--;nColumn *= 3;//Try calculating this expression (E.g : 1;2;3)
int nItems = 0;
if(IsPlayer(Player, nColumn + 1) == true)nItems++;
if(IsPlayer(Player, nColumn + 2) == true)nItems++;
if(IsPlayer(Player, nColumn + 3) == true)nItems++;

if(nItems == 2)
{
if(IsEmpty(nColumn + 1) == true)return nColumn + 1;
if(IsEmpty(nColumn + 2) == true)return nColumn + 2;
if(IsEmpty(nColumn + 3) == true)return nColumn + 3;

}
return 0;
}

int ThinkRow(bool Player, int nRow){
int nItems = 0;
if(IsPlayer(Player, nRow + 0) == true)nItems++;
if(IsPlayer(Player, nRow + 3) == true)nItems++;
if(IsPlayer(Player, nRow + 6) == true)nItems++;

if(nItems == 2)
{
if(IsEmpty(nRow + 0) == true)return nRow + 0;
if(IsEmpty(nRow + 3) == true)return nRow + 3;
if(IsEmpty(nRow + 6) == true)return nRow + 6;
}
return 0;
}

int ThinkOther(bool Player, int nLine){
int nItems = 0;
if(nLine == 1){
	if(IsPlayer(Player, 1) == true)nItems++;
	if(IsPlayer(Player, 5) == true)nItems++;
	if(IsPlayer(Player, 9) == true)nItems++;
}
else if(nLine == 2){
	if(IsPlayer(Player, 3) == true)nItems++;
	if(IsPlayer(Player, 5) == true)nItems++;
	if(IsPlayer(Player, 7) == true)nItems++;
}


if(nItems == 2) //There are two player pieces
{
if(nLine == 1){
	if(IsEmpty(1) == true)return 1;
	if(IsEmpty(5) == true)return 5;
	if(IsEmpty(9) == true)return 9;
}
else if(nLine == 2){
	if(IsEmpty(3) == true)return 3;
	if(IsEmpty(5) == true)return 5;
	if(IsEmpty(7) == true)return 7;
}
}
return 0;
}

int ThinkSpecificItem(bool Player, int nIndex)
{
if(IsPlayer(Player, nIndex))
{
if(nIndex == 2 || nIndex == 8)
{
	if(IsEmpty(4) == true && (nIndex == 2 && IsEmpty(1) == true) || (nIndex == 8 && IsEmpty(7) == true))return 4;
	if(IsEmpty(6) == true && (nIndex == 2 && IsEmpty(3) == true) || (nIndex == 8 && IsEmpty(9) == true))return 6;
	if(IsEmpty(5) == true)return 5;
}
else if(nIndex == 4 || nIndex == 6)
{
	if(IsEmpty(2) == true && (nIndex == 4 && IsEmpty(1) == true) || (nIndex == 6 && IsEmpty(3) == true))return 2;
	if(IsEmpty(8) == true && (nIndex == 4 && IsEmpty(7) == true) || (nIndex == 6 && IsEmpty(9) == true))return 8;
	if(IsEmpty(5) == true)return 5;
}
else if(nIndex == 1)
{
if(IsPlayer(Player, 5) == true && IsEmpty(3) == true && (IsEmpty(2) == true || IsEmpty(9) == true))return 3;
if(IsEmpty(2) == true && IsEmpty(3) == true)return 2;
//if(IsPlayer(Player, 2)  && IsPlayer(Player, 3))return 4;
if(IsEmpty(4) == true && IsEmpty(7) == true)return 4;
if(IsEmpty(5) == true)return 5;
}
else if(nIndex == 3)
{
if(IsPlayer(Player, 5) == true && IsEmpty(1) == true && (IsEmpty(2) == true || IsEmpty(7) == true))return 1;
if(IsEmpty(2) == true && IsEmpty(1) == true)return 2;
if(IsEmpty(6) == true && IsEmpty(9) == true)return 6;
if(IsEmpty(5) == true)return 5;
}
else if(nIndex == 7)
{
if(IsPlayer(Player, 5) == true && IsEmpty(9) == true && (IsEmpty(8) == true || IsEmpty(3) == true))return 9;
if(IsEmpty(4) == true && IsEmpty(1) == true)return 4;
if(IsEmpty(8) == true && IsEmpty(9) == true)return 8;
if(IsEmpty(5) == true)return 5;
}
else if(nIndex == 9)
{
if(IsPlayer(Player, 5) == true && IsEmpty(7) == true && (IsEmpty(8) == true || IsEmpty(1) == true))return 7;
if(IsEmpty(6) == true && IsEmpty(3) == true)return 6;
if(IsEmpty(8) == true && IsEmpty(7) == true)return 8;
if(IsEmpty(5) == true)return 5;
}
}
return 0;
}

void Think(bool Player)
{
char mark = (Player == X) ? 'X' : 'O';
bool bResult;
int choice;
bool Enemy = !Player;
///////////////Method 1...////////////////////////////////////////////////////
if((choice = ThinkOther(Player, 1)) != 0){square[choice] = mark;return;}
if((choice = ThinkOther(Player, 2)) != 0){square[choice] = mark;return;}
for(int b = 1; b <= 3; b++){
if((choice = ThinkColumn(Player, b)) != 0){square[choice] = mark;return;}
if((choice = ThinkRow(Player, b)) != 0){square[choice] = mark;return;}}
if((choice = ThinkOther(Enemy, 1)) != 0){square[choice] = mark;return;}
if((choice = ThinkOther(Enemy, 2)) != 0){square[choice] = mark;return;}

///////////////Method 2...////////////////////////////////////////////////////////
bResult = (IsPlayer(Player, 2) == true && IsPlayer(Player, 4) == true);
if(bResult == true && IsEmpty(1) == true){square[1] = mark;return;}
bResult = (IsPlayer(Player, 2) == true && IsPlayer(Player, 6) == true);
if(bResult == true && IsEmpty(3) == true){square[3] = mark;return;}
bResult = (IsPlayer(Player, 4) == true && IsPlayer(Player, 8) == true);
if(bResult == true && IsEmpty(7) == true){square[7] = mark;return;}
bResult = (IsPlayer(Player, 6) == true && IsPlayer(Player, 8) == true);
if(bResult == true && IsEmpty(7) == true){square[9] = mark;return;}

///////////////Method 3...////////////////////////////////////////////////////////
for(int a = 1; a <= 3; a++){
if((choice = ThinkColumn(Enemy, a)) != 0){square[choice] = mark;return;}
if((choice = ThinkRow(Enemy, a)) != 0){square[choice] = mark;return;}}

///////////////Method 4...////////////////////////////////////////////////////////
for(int c = 1; c <= 9; c++)
if((choice = ThinkSpecificItem(Player, c)) != 0){square[choice] = mark;return;}

///////////////Method 5...////////////////////////////////////////////////////////
do choice = rand() % 9 + 1;while(IsEmpty(choice) == false);square[choice] = mark;
}



//////////////////////////////////////////////////////////////////////////////////
int main()
{
srand(time(NULL));
bool player = X;
char mark;
int i, choice;
cout << "Computer first? (Press Y) : ";
cin >> mark;
if(mark == 'y' || mark == 'Y')player = Y;
system("cls");
////////////////////
do
{
board();
mark = (player == X) ? 'X' : 'O';
if(player == X)
{
cout << "Player " << player << " ("<< mark <<"), please enter a number : ";
cin >> choice;
if(SetItem(choice, mark) == false){
	cout<<"Invalid move ";
	player = !player; //mark = (player == 1) ? 'O' : 'X';
	cin.ignore();
	cin.get();
}
}
else Think(player);



i = checkwin();

player = !player;}while(i == -1);

board();
if(i == 1) cout<<"==>\a Player "<< ((player == X) ? 'O' : 'X') <<" win ";
return 0;
}

//////////////////////////////////////////////////////////////////////////////////

int checkwin()
{
if (square[1] == square[2] && square[2] == square[3])return 1;
if (square[4] == square[5] && square[5] == square[6])return 1;
if (square[7] == square[8] && square[8] == square[9])return 1;
if (square[1] == square[4] && square[4] == square[7])return 1;
if (square[2] == square[5] && square[5] == square[8])return 1;
if (square[3] == square[6] && square[6] == square[9])return 1;
if (square[1] == square[5] && square[5] == square[9])return 1;
if (square[3] == square[5] && square[5] == square[7])return 1;

for(int i = 1;i <= 9;i++)if(IsEmpty(i) == true)return -1;

board();
cout<<"==>\aGame draw\n";
system("pause");
exit(0);
return 0;
}


void board()
{
system("cls");
cout << "\n\n\tTic Tac Toe\n\n";
cout << "Player 1 (X) - Computer (O)" << endl << endl << endl;
cout << "____________" << endl;
cout << "|  |   |   |  " << endl;
cout << "|" << square[1] << " | " << square[2] << " | " << square[3] << " | " << endl;
cout << "____________" << endl;
cout << "|  |   |   |  " << endl;
cout << "|" << square[4] << " | " << square[5] << " | " << square[6] <<  " | " << endl;
cout << "____________" << endl;
cout << "|  |   |   |  " << endl;
cout << "|" << square[7] << " | " << square[8] << " | " << square[9] <<  " | " << endl;
cout << "____________" << endl;
}


Enjoy!
If you need help with anything just ask here...
Last edited on
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