C program to design a TIC TAC TOE game.

/*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;

 

}