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C program to design a TIC TAC TOE game

This program is a small game Tic Tac Toe in C programming, here two users can play this game and after completing the game program will show the winner user name. This program is created using by Two Dimensional Array.

TIC TAC TOE Game using C program

/*C program to design a TIC  TAC TOE game.*/

#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;
}

Output

Enter name of user1 :USR1
Enter name of user2 :USR2

			[  X ] [  _ ] [  O ] 
			[  O ] [  _ ] [  _ ] 
			[  _ ] [  _ ] [  X ] 

    *** USR1 , Enter value (00-22) seperated by space : 1 1
    
    
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