Create tictactoe.cpp

Games/tic tac toe/tictactoe.cpp

@@ -0,0 +1,196 @@
+#include<bits/stdc++.h> 
+using namespace std; 
+
+#define COMPUTER 1 
+#define HUMAN 2 
+
+#define SIDE 3 // Length of the board 
+
+#define COMPUTERMOVE 'O' 
+#define HUMANMOVE 'X' 
+
+
+void showBoard(char board[][SIDE]) 
+{ 
+    printf("\n\n"); 
+
+    printf("\t\t\t  %c | %c  | %c  \n", board[0][0], 
+                             board[0][1], board[0][2]); 
+    printf("\t\t\t--------------\n"); 
+    printf("\t\t\t  %c | %c  | %c  \n", board[1][0], 
+                             board[1][1], board[1][2]); 
+    printf("\t\t\t--------------\n"); 
+    printf("\t\t\t  %c | %c  | %c  \n\n", board[2][0], 
+                             board[2][1], board[2][2]); 
+
+    return; 
+} 
+
+
+void showInstructions() 
+{ 
+    printf("\t\t\t  Tic-Tac-Toe\n\n"); 
+    printf("Choose a cell numbered from 1 to 9 as below"
+            " and play\n\n"); 
+
+    printf("\t\t\t  1 | 2  | 3  \n"); 
+    printf("\t\t\t--------------\n"); 
+    printf("\t\t\t  4 | 5  | 6  \n"); 
+    printf("\t\t\t--------------\n"); 
+    printf("\t\t\t  7 | 8  | 9  \n\n"); 
+
+    printf("-\t-\t-\t-\t-\t-\t-\t-\t-\t-\n\n"); 
+
+    return; 
+} 
+
+
+void initialise(char board[][SIDE], int moves[]) 
+{ 
+
+    srand(time(NULL));  
+
+    for (int i=0; i<SIDE; i++) 
+    { 
+        for (int j=0; j<SIDE; j++) 
+            board[i][j] = ' '; 
+    } 
+
+
+    for (int i=0; i<SIDE*SIDE; i++) 
+        moves[i] = i; 
+
+    random_shuffle(moves, moves + SIDE*SIDE); 
+
+    return; 
+} 
+
+
+void declareWinner(int whoseTurn) 
+{ 
+    if (whoseTurn == COMPUTER) 
+        printf("COMPUTER has won\n"); 
+    else
+        printf("HUMAN has won\n"); 
+    return; 
+} 
+
+
+bool rowCrossed(char board[][SIDE]) 
+{ 
+    for (int i=0; i<SIDE; i++) 
+    { 
+        if (board[i][0] == board[i][1] && 
+            board[i][1] == board[i][2] &&  
+            board[i][0] != ' ') 
+            return (true); 
+    } 
+    return(false); 
+} 
+
+bool columnCrossed(char board[][SIDE]) 
+{ 
+    for (int i=0; i<SIDE; i++) 
+    { 
+        if (board[0][i] == board[1][i] && 
+            board[1][i] == board[2][i] &&  
+            board[0][i] != ' ') 
+            return (true); 
+    } 
+    return(false); 
+} 
+
+bool diagonalCrossed(char board[][SIDE]) 
+{ 
+    if (board[0][0] == board[1][1] && 
+        board[1][1] == board[2][2] &&  
+        board[0][0] != ' ') 
+        return(true); 
+
+    if (board[0][2] == board[1][1] && 
+        board[1][1] == board[2][0] && 
+         board[0][2] != ' ') 
+        return(true); 
+
+    return(false); 
+} 
+
+
+bool gameOver(char board[][SIDE]) 
+{ 
+    return(rowCrossed(board) || columnCrossed(board) 
+            || diagonalCrossed(board) ); 
+} 
+
+
+void playTicTacToe(int whoseTurn) 
+{ 
+    // A 3*3 Tic-Tac-Toe board for playing  
+    char board[SIDE][SIDE]; 
+
+    int moves[SIDE*SIDE]; 
+
+    // Initialise the game 
+    initialise(board, moves); 
+
+    // Show the instructions before playing 
+    showInstructions(); 
+
+    int moveIndex = 0, x, y; 
+
+    // Keep playing till the game is over or it is a draw 
+    while (gameOver(board) == false &&  
+            moveIndex != SIDE*SIDE) 
+    { 
+        if (whoseTurn == COMPUTER) 
+        { 
+            x = moves[moveIndex] / SIDE; 
+            y = moves[moveIndex] % SIDE; 
+            board[x][y] = COMPUTERMOVE; 
+            printf("COMPUTER has put a %c in cell %d\n", 
+                    COMPUTERMOVE, moves[moveIndex]+1); 
+            showBoard(board); 
+            moveIndex ++; 
+            whoseTurn = HUMAN; 
+        } 
+
+        else if (whoseTurn == HUMAN) 
+        { 
+            x = moves[moveIndex] / SIDE; 
+            y = moves[moveIndex] % SIDE; 
+            board[x][y] = HUMANMOVE; 
+            printf ("HUMAN has put a %c in cell %d\n", 
+                    HUMANMOVE, moves[moveIndex]+1); 
+            showBoard(board); 
+            moveIndex ++; 
+            whoseTurn = COMPUTER; 
+        } 
+    } 
+
+    // If the game has drawn 
+    if (gameOver(board) == false &&  
+            moveIndex == SIDE * SIDE) 
+        printf("It's a draw\n"); 
+    else
+    { 
+        // Toggling the user to declare the actual 
+        // winner 
+        if (whoseTurn == COMPUTER) 
+            whoseTurn = HUMAN; 
+        else if (whoseTurn == HUMAN) 
+            whoseTurn = COMPUTER; 
+
+        // Declare the winner 
+        declareWinner(whoseTurn); 
+    } 
+    return; 
+} 
+
+
+int main() 
+{ 
+    // Let us play the game with COMPUTER starting first 
+    playTicTacToe(COMPUTER); 
+
+    return (0); 
+}