game.c

#include <stdio.h>

#include <stdlib.h>

/*print matrix*/

void printMatrix(char val);

/*update value in matrix*/

void insertValue(int i, int j, unsigned char user);

/*check matrix is full or not*/

unsigned char isFull(void);

/*check game is completed or not.*/

unsigned char isOver(void);

unsigned char mat[3][3] = { '_', '_', '_', '_', '_', '_', '_', '_', '_' };

unsigned char usertern = 0;

unsigned char onlyOnce = 0;

int main()

{

    unsigned char user1[30], user2[30], winner;

    int ival, jval;

    printf("\nEnter name of user1 :");

    gets(user1);

    fflush(stdin);

    printf("Enter name of user2 :");

    gets(user2);

    fflush(stdin);

again:

    system("clear");

    printf("\n\n\n\n");

    if (!onlyOnce) {

        printMatrix(0);

        onlyOnce = 1;

    }

    else {

        printMatrix(1);

    }

    winner = isOver();

    if (winner) {

        printf("\n *** Congratulations Dear %s ,\n     You have won the game . !!!!", ((winner == 'X') ? user1 : user2));

        goto end;

    }

    if (!isFull()) {

        printf("\n *** Game Over .");

        goto end;

    }

repeat:

    fflush(stdin);

    printf("\n *** %s , Enter value (00-22) seperated by space :", (usertern == 0x00 ? user1 : user2));

    scanf("%d%d", &ival, &jval);

    if ((ival > 2 || ival < 0) || (jval > 2 || jval < 0)) {

        printf("\n *** ERROR : Invalid index, try again !!!");

        goto repeat;

    }

    if (mat[ival][jval] != '_') {

        printf("\n *** ERROR : Already filled,try again !!!");

        goto repeat;

    }

    insertValue(ival, jval, usertern);

    usertern = !usertern;

    goto again;

end:

    printf("\n");

    return 0;

}

void printMatrix(char val)

{

    unsigned char i, j;

    if (!val) {

        /*For blank matrix*/

        for (i = 0; i < 3; i++) {

            printf("\t\t\t");

            for (j = 0; j < 3; j++) {

                printf("[%3c ] ", mat[i][j]);

            }

            printf("\n");

        }

        return;

    }

    for (i = 0; i < 3; i++) {

        printf("\t\t\t");

        for (j = 0; j < 3; j++) {

            printf("[%3c ] ", mat[i][j]);

        }

        printf("\n");

    }

    return;

}

void insertValue(int i, int j, unsigned char user)

{

    //  printf("\n ##### %d, %d ###\n",i,j);

    mat[i][j] = ((user == 0x00) ? 'X' : 'O');

}

unsigned char isFull(void)

{

    unsigned char i, j, count = 0;

    ;

    for (i = 0; i < 3; i++)

        for (j = 0; j < 3; j++) {

            if (mat[i][j] == '_')

                ++count;

        }

    return count;

}

unsigned char isOver(void)

{

    unsigned char i, j, user;

    unsigned char storeChar = 0, flag;

    int sum = 0;

    // case 1

    /*sum of 'X'+'X'+'X' = 264 and sum of 'O'+'O'+'O' =237*/

    flag = 0;

    for (i = 0; i < 3; i++) {

        sum = 0;

        for (j = 0; j < 3; j++) {

            if (mat[i][j] == '_')

                break;

            sum += mat[i][j];

            storeChar = mat[i][j];

        }

        if (sum == 237 || sum == 264) {

            return storeChar;

        }

    }

    // case 2

    for (i = 0; i < 3; i++) {

        sum = 0;

        for (j = 0; j < 3; j++) {

            if (mat[j][i] == '_')

                break;

            sum += mat[j][i];

            storeChar = mat[j][i];

        }

        if (sum == 237 || sum == 264) {

            return storeChar;

        }

    }

    // case 3

    for (i = 0; i < 3; i++) {

        sum = 0;

        for (j = 0; j < 3; j++) {

            if (i == j) {

                if (mat[i][j] == '_')

                    break;

                sum += mat[i][j];

                storeChar = mat[i][j];

            }

        }

        if (sum == 237 || sum == 264) {

            return storeChar;

        }

    }

    return 0;

}