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Author: sureshchand001a

tic-tac-toe-game-in-c/tic tac toe.c

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+#include<stdio.h>
+#include<conio.h>
+#include<stdlib.h>
+#include <windows.h>
+
+int board[10] = {2,2,2,2,2,2,2,2,2,2};
+int turn = 1,flag = 0;
+int player,comp;
+
+void menu();
+void go(int n);
+void start_game();
+void check_draw();
+void draw_board();
+void player_first();
+void put_X_O(char ch,int pos);
+COORD coord= {0,0}; // this is global variable
+//center of axis is set to the top left cornor of the screen
+void gotoxy(int x,int y)
+{
+    coord.X=x;
+    coord.Y=y;
+    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),coord);
+}
+
+void main()
+{
+    system("cls");
+    menu();
+    getch();
+
+}
+
+void menu()
+{
+    int choice;
+    system("cls");
+    printf("\n--------MENU--------");
+    printf("\n1 : Play with X");
+    printf("\n2 : Play with O");
+    printf("\n3 : Exit");
+    printf("\nEnter your choice:>");
+    scanf("%d",&choice);
+    turn = 1;
+    switch (choice)
+    {
+    case 1:
+        player = 1;
+        comp = 0;
+        player_first();
+        break;
+    case 2:
+        player = 0;
+        comp = 1;
+        start_game();
+        break;
+    case 3:
+        exit(1);
+    default:
+        menu();
+    }
+}
+
+int make2()
+{
+    if(board[5] == 2)
+        return 5;
+    if(board[2] == 2)
+        return 2;
+    if(board[4] == 2)
+        return 4;
+    if(board[6] == 2)
+        return 6;
+    if(board[8] == 2)
+        return 8;
+    return 0;
+}
+
+int make4()
+{
+    if(board[1] == 2)
+        return 1;
+    if(board[3] == 2)
+        return 3;
+    if(board[7] == 2)
+        return 7;
+    if(board[9] == 2)
+        return 9;
+    return 0;
+}
+
+int posswin(int p)
+{
+// p==1 then X   p==0  then  O
+    int i;
+    int check_val,pos;
+
+    if(p == 1)
+        check_val = 18;
+    else
+        check_val = 50;
+
+    i = 1;
+    while(i<=9)//row check
+    {
+        if(board[i] * board[i+1] * board[i+2] == check_val)
+        {
+            if(board[i] == 2)
+                return i;
+            if(board[i+1] == 2)
+                return i+1;
+            if(board[i+2] == 2)
+                return i+2;
+        }
+        i+=3;
+    }
+
+    i = 1;
+    while(i<=3)//column check
+    {
+        if(board[i] * board[i+3] * board[i+6] == check_val)
+        {
+            if(board[i] == 2)
+                return i;
+            if(board[i+3] == 2)
+                return i+3;
+            if(board[i+6] == 2)
+                return i+6;
+        }
+        i++;
+    }
+
+    if(board[1] * board[5] * board[9] == check_val)
+    {
+        if(board[1] == 2)
+            return 1;
+        if(board[5] == 2)
+            return 5;
+        if(board[9] == 2)
+            return 9;
+    }
+
+    if(board[3] * board[5] * board[7] == check_val)
+    {
+        if(board[3] == 2)
+            return 3;
+        if(board[5] == 2)
+            return 5;
+        if(board[7] == 2)
+            return 7;
+    }
+    return 0;
+}
+
+void go(int n)
+{
+    if(turn % 2)
+        board[n] = 3;
+    else
+        board[n] = 5;
+    turn++;
+}
+
+void player_first()
+{
+    int pos;
+
+    check_draw();
+    draw_board();
+    gotoxy(30,18);
+    printf("Your Turn :> ");
+    scanf("%d",&pos);
+
+    if(board[pos] != 2)
+        player_first();
+
+    if(pos == posswin(player))
+    {
+        go(pos);
+        draw_board();
+        gotoxy(30,20);
+        //textcolor(128+RED);
+        printf("Player Wins");
+        getch();
+        exit(0);
+    }
+
+    go(pos);
+    draw_board();
+    start_game();
+}
+
+void start_game()
+{
+// p==1 then X   p==0  then  O
+    if(posswin(comp))
+    {
+        go(posswin(comp));
+        flag = 1;
+    }
+    else if(posswin(player))
+        go(posswin(player));
+    else if(make2())
+        go(make2());
+    else
+        go(make4());
+    draw_board();
+
+    if(flag)
+    {
+        gotoxy(30,20);
+        //textcolor(128+RED);
+        printf("Computer wins");
+        getch();
+    }
+    else
+        player_first();
+}
+
+void check_draw()
+{
+    if(turn > 9)
+    {
+        gotoxy(30,20);
+        //textcolor(128+RED);
+        printf("Game Draw");
+        getch();
+        exit(0);
+    }
+}
+
+void draw_board()
+{
+    int j;
+
+    for(j=9; j<17; j++)
+    {
+        gotoxy(35,j);
+        printf("|       |");
+    }
+    gotoxy(28,11);
+    printf("-----------------------");
+    gotoxy(28,14);
+    printf("-----------------------");
+
+    for(j=1; j<10; j++)
+    {
+        if(board[j] == 3)
+            put_X_O('X',j);
+        else if(board[j] == 5)
+            put_X_O('O',j);
+    }
+}
+
+void put_X_O(char ch,int pos)
+{
+    int m;
+    int x = 31, y = 10;
+
+    m = pos;
+
+    if(m > 3)
+    {
+        while(m > 3)
+        {
+            y += 3;
+            m -= 3;
+        }
+    }
+    if(pos % 3 == 0)
+        x += 16;
+    else
+    {
+        pos %= 3;
+        pos--;
+        while(pos)
+        {
+            x+=8;
+            pos--;
+        }
+    }
+    gotoxy(x,y);
+    printf("%c",ch);
+}