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Answer to Question #5776 in C++ for alaa abu al-saud

Question #5776
tic tac toe game ( human vs computer)
Expert's answer
C++:
tic tac toe game ( human vs computer)

#include<iostream.h> //opening headerfile iostream for in-out
#include<conio.h> //opening headerfile conio for clrscr();
#include<stdlib.h> //opening headerfile stdlib for
random(int);
char tic[3][3]; //global matrix declerations
int d,e,f,a,t,i,j,x,y; & //global variables declerations
void display(); //displays the matrix
void user(); //function for user's move
void newdisp(); //function for display of matrix after
every
move
void pc(); & //function for pc's move
int check(); //function for finding out the winner
int horcheck(); //function for horizontal line check
int vercheck(); //function for vertical line check
int diagcheck(); & //function for diagonal line check
main() //main function
{
clrscr(); //clears the previous output screen
randomize(); //initialize random function calling
int d=random(2); & //random function call
for(i=0;i<3;i++)
for(j=0;j<3;j++)
tic[i][j]=' '; & //assigning space ' ' to all elements of matrix
display(); & //display function call
d==0?user():pc(); //random starting of the game depending
on d
getch(); //provides output by getting input
without
returning to program
return 0; //return int to main function
}
void display() //display function definition
{
for(t=0;t<3;t++)
{
cout<<"& quot;<<tic[t][0]<<" | "<<tic[t][1]<<" | "<<tic[t][2]<<endl;
//figure formation
if(t!=2)
cout<<"& --|---|--"<<endl;
}
}
void user() //user function definition
{
cout<<"&

ENTER THE CO-ORDINATES WHERE YOU WANT TO PUT UR 'X' i.e
0,1,2
";
cin>>x>>y;
if((x<0)||(x>2)&&(y<0)||(y>2))& //check for valid co-ordinates
{
cout<<"&

ENTER THE CORRECT CO-ORDINATES";
user(); //user function call
}
else
{
if(tic[x][y]==' ') //check for vacant space at entered co-ordinates
& {
& tic[x][y]='X';& //assigning user 'X' to the co-ordinates
& newdisp(); //newdisp function call
& }
else
& {
& cout<<"&

THIS POSITION IS ALREADY FILLED. CHOOSE SOME OTHER
CO-ORDINATES";
& user(); //user function call
& }
}
d=check(); //check function call
if(d==0)
pc(); & //pc function call
else
{
cout<<"&

YOU ARE THE WINNER";
getche(); & //requires enter to return to program. prevents return
without display
exit(1); //program termination
}
}
void newdisp() & //newdisp function definition
{
for(t=0;t<3;t++)
{
cout<<"& quot;<<tic[t][0]<<" | "<<tic[t][1]<<" | "<<tic[t][2]<<endl;
//displays new tictactoe after user or pc turn
if(t!=2)
cout<<"& --|---|--"<<endl;
}
}
void pc() //pc function call
{
int f,z;
randomize(); //initialize random function calling
cout<<"&

THIS IS THE COMPUTER'S MOVE

";
for(i=0;i<=20;i++)
{
f=random(3);
z=random(3);
if(tic[f][z]==' ') //check for vacant space at entered
co-ordinates
& {
& tic[f][z]='O';& //assigning pc 'O' to the co-ordinates
& goto x; //exiting for loop to display new tictactoe
& }
else
continue; //
}
x:newdisp(); & //newdisp function call
d=check(); //check function call
if(d==0)
user(); //user function call
else
{
cout<<"&

I'M THE WINNER";
getche(); & //requires enter to return to program. prevents
return without display
exit(1); //program termination
}
}
check() //check function definition
{
horcheck(); & //horcheck function call
vercheck(); & //vercheck function call
diagcheck(); //diagcheck function call
return (d||e||f);
}
horcheck() //horcheck function definition
{
if(((tic[0][0]==tic[0][1])&&(tic[0][1]==tic[0][2])&&(tic[0][1]!='
'))||((tic[1][0]==tic[1][1])&&(tic[1][1]==tic[1][2])&&(tic[1][1]!='
'))||((tic[2][0]==tic[2][1])&&(tic[2][1]==tic[2][2])&&(tic[2][2]!='
')))
d=1; //checks each element of a horizontal line
to
be same
else //returns 1 if all 3 elements of any
horizontal line are same
d=0; //else returns 0
return d;
}
vercheck() //vercheck function definition
{
if(((tic[0][0]==tic[1][0])&&(tic[1][0]==tic[2][0])&&(tic[0][0]!='
'))||((tic[0][1]==tic[1][1])&&(tic[1][1]==tic[2][1])&&(tic[0][1]!='
'))||((tic[0][2]==tic[1][2])&&(tic[1][2]==tic[2][2])&&(tic[0][2]!='
')))
e=1; //checks each element of a vertical line to
be
same
else //returns 1 if all 3 elements of any
vertical
line are same
e=0; //else returns 0
return e;
}
diagcheck() & //diagcheck function definition
{
if(((tic[0][0]==tic[1][1])&&(tic[1][1]==tic[2][2])&&(tic[0][0]!='
'))||((tic[0][2]==tic[1][1])&&(tic[1][1]==tic[2][0])&&(tic[1][1]!='
')))
f=1; //checks each element of a diagonal line to
be
same
else //returns 1 if all 3 elements of any
diagonal
line are same
f=0; //else returns 0
return f;
}

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