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tictactoe.cpp
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tictactoe.cpp
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#include<stdio.h>
#include<iostream>
#include<stdlib.h>
using namespace std;
int board[9];
int decision, turn=1;
int i,player,choice;
void user_turn();
void comp_turn();
void display_board();
int main(){
for (i=0;i<9;i++)
{
board[i]=2;
}
display_board();
cout<<"Who wants to play first?\n";
cout<<"Select 1 if you want to play first.\n";
cout<<"3 will be displayed for user move\n";
cout<<"Select 2 if you want computer to play first\n";
cout<<"5 will be displayed for computer move\n";
cin>>decision;
switch(decision)
{
case 1:
cout<<"You chose to play first\n";
display_board();
user_turn();
case 2:
cout<<"Computer plays first\n";
display_board();
comp_turn();
default:
cout<<"Invalid option\n";
}
}
void display_board()
{
for(i=0;i<9;i++)
{
if(board[i]==2)
board[i]= 2;
else if(board[i]==3)
board[i]=3;
else
board[i]=5;
}
cout<<board[0]<<"|"<<board[1]<<"|"<<board[2]<<endl;
cout<<"_"<<" "<<"_"<<" "<<"_"<<" "<<endl;
cout<<board[3]<<"|"<<board[4]<<"|"<<board[5]<<endl;
cout<<"_"<<" "<<"_"<<" "<<"_"<<" "<<endl;
cout<<board[6]<<"|"<<board[7]<<"|"<<board[8]<<endl;
cout<<"_"<<" "<<"_"<<" "<<"_"<<" "<<endl;
}
void check_win()
{
if(board[0]==3 && board[1]==3 && board[2]==3)
{
cout<<"user wins";
exit(0);
}
if(board[3]==3 && board[4]==3 && board[5]==3)
{
cout<<"user wins\n";
exit(0);
}
if(board[6]==3 && board[7]==3 && board[8]==3)
{
cout<<"user wins\n";
exit(0);
}
if(board[0]==3 && board[3]==3 && board[6]==3)
{
cout<<"user wins\n";
exit(0);
}
if(board[1]==3 && board[4]==3 && board[7]==3)
{
cout<<"user wins\n";
exit(0);
}
if(board[2]==3 && board[5]==3 && board[8]==3)
{
cout<<"user wins\n";
exit(0);
}
if(board[0]==3 && board[4]==3 && board[8]==3)
{
cout<<"user wins\n";
exit(0);
}
if(board[2]==3 && board[4]==3 && board[6]==3)
{
cout<<"user wins\n";
exit(0);
}
}
int possible_win(int player)
{
int possible_win=-1;
if(player==3)
{
if(board[0]*board[1]*board[2]==18)
{
if(board[0]==2)
possible_win=0;
if(board[1]==2)
possible_win=1;
if(board[2]==2)
possible_win=2;
}
if(board[3]*board[4]*board[5]==18)
{
if(board[3]==2)
possible_win=3;
else if(board[4]==2)
possible_win =4;
else
{
if(board[5]==2)
possible_win =5;
}
}
if(board[6]*board[7]*board[8]==18)
{
if(board[6]==2)
possible_win=6;
else if(board[7]==2)
possible_win =7;
else
{
if(board[8]==2)
possible_win =8;
}
}
if(board[0]*board[3]*board[6]==18)
{
if(board[0]==2)
possible_win=0;
else if(board[3]==2)
possible_win =3;
else
{
if(board[6]==2)
possible_win =6;
}
}
if(board[1]*board[4]*board[7]==18)
{
if(board[1]==2)
possible_win=1;
else if(board[4]==2)
possible_win =4;
else
{
if(board[7]==2)
possible_win =7;
}
}
if(board[2]*board[5]*board[8]==18)
{
if(board[2]==2)
possible_win=2;
else if(board[5]==2)
possible_win =5;
else
{
if(board[8]==2)
possible_win =8;
}
}
if(board[0]*board[4]*board[8]==18)
{
if(board[0]==2)
possible_win=0;
else if(board[4]==2)
possible_win =4;
else
{
if(board[8]==2)
possible_win =8;
}
}
if(board[2]*board[4]*board[6]==18)
{
if(board[2]==2)
possible_win=2;
else if(board[4]==2)
possible_win =4;
else
{
if(board[6]==2)
possible_win =6;
}
}
}
if (player==5)
{
if(board[0]*board[1]*board[2]==50)
{
if(board[0]==2)
possible_win=0;
else if(board[1]==2)
possible_win=1;
else
{
if(board[2]==2)
possible_win=2;
}
}
if(board[3]*board[4]*board[5]==50)
{
if(board[3]==2)
possible_win=3;
else if(board[4]==2)
possible_win =4;
else
{
if(board[5]==2)
possible_win =5;
}
}
if(board[6]*board[7]*board[8]==50)
{
if(board[6]==2)
possible_win=6;
else if(board[7]==2)
possible_win =7;
else
{
if(board[8]==2)
possible_win =8;
}
}
if(board[0]*board[3]*board[6]==50)
{
if(board[0]==2)
possible_win=0;
else if(board[3]==2)
possible_win =3;
else
{
if(board[6]==2)
possible_win =6;
}
}
if(board[1]*board[4]*board[7]==50)
{
if(board[1]==2)
possible_win=1;
else if(board[4]==2)
possible_win =4;
else
{
if(board[7]==2)
possible_win =7;
}
}
if(board[2]*board[5]*board[8]==50)
{
if(board[2]==2)
possible_win=2;
else if(board[5]==2)
possible_win =5;
else
{
if(board[8]==2)
possible_win =8;
}
}
if(board[0]*board[4]*board[8]==50)
{
if(board[0]==2)
possible_win=0;
else if(board[4]==2)
possible_win =4;
else
{
if(board[8]==2)
possible_win =8;
}
}
if(board[2]*board[4]*board[6]==50)
{
if(board[2]==2)
possible_win=2;
else if(board[4]==2)
possible_win =4;
else
{
if(board[6]==2)
possible_win =6;
}
}
}
return possible_win;
}
void user_turn(){
cout<<"turn is"<<turn<<endl;
cout<<"user turn\n";
cout<<"enter your choice\n";
cin>>choice;
if (board[choice]==2)
{
board[choice]=3;
display_board();
check_win();
if(turn==9)
{
cout<<"game draw\n";
}
else
turn++;
comp_turn();
}
else
cout<<"place not empty\n";
user_turn();
}
void comp_turn()
{
cout<<"Computer turn\n";
cout<<"turn is "<<turn<<"\n";
switch(turn)
{
case 1:
board[0]=5;
display_board();
turn++;
user_turn();
case 2:
if(board[4]==2)
{
board[4]=5;
display_board();
turn++;
user_turn();
}
else
{
board[0]=5;
display_board();
turn++;
user_turn();
}
case 3:
if(board[8]==2)
{
board[8]=5;
display_board();
turn++;
user_turn();
}
else
{
board[2]=5;
display_board();
turn++;
user_turn();
}
case 4:
if(possible_win(3)>=0)
{
board[possible_win(3)]=5;
display_board();
turn++;
user_turn();
}
else
{
if(board[1]==3 &&board[7]==3)
{
board[6]=5;
display_board();
turn++;
user_turn;
}
else
{
if(board[2]==3 && board[7]==3)
{
board[8]=5;
display_board();
turn++;
user_turn;
}
else if(board[0]==2 && board[5]==2)
{
board[2]=5;
display_board();
turn++;
user_turn;
}
else if(board[2]==3 && board[3]==3)
{
board[0]=5;
display_board();
turn++;
user_turn;
}
else if(board[6]==3 && board[5]==3)
{
board[8]=5;
display_board();
turn++;
user_turn;
}
else if(board[6]==3 && board[1]==3)
{
board[0]=5;
display_board();
turn++;
user_turn;
}
else if(board[8]==3 && board[3]==3)
{
board[6]=5;
display_board();
turn++;
user_turn;
}
else if(board[8]==3 && board[1]==3)
{
board[2]=5;
display_board();
turn++;
user_turn;
}
else
{
if(board[4]==2)
{
board[4]=5;
display_board();
turn++;
user_turn;
}
else
{
if(board[2]==2)
{
board[2]=5;
display_board();
turn++;
user_turn();
}
else
{
board[6]=5;
display_board();
turn++;
user_turn();
}
}
}
}
}
case 5:
if (possible_win(5)>=0)
{
if(board[possible_win(5)]==2)
{
board[possible_win(5)]=5;
display_board();
cout<<"cpu wins\n";
break;
}
}
else
if (possible_win(3)>=0)
{
board[possible_win(3)]=5;
display_board();
turn++;
user_turn();
}
else