TheAlgorithms-C/games/tic_tac_toe.c

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/**
* @file tic-tac-toe.c
* @author [vivekboss99](github.com/vivekboss99)
* @author [Krishna Vedala](https://github.com/kvedala)
* @brief [Tic-Tac-Toe game](https://en.wikipedia.org/wiki/Tic-tac-toe)
* implementation in C
* @details Tic-Tac-Toe Game, where the user can decide to play with the
* computer(single player mode) or with other user(double player mode), the
* code as an array named 'game_table' which is the table and user needs to enter the
* position inside the array(from 1-9) where he/she wants to place 'X' or 'O' on the
* table.
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
// Functions Declarations
static void singlemode();
static void doublemode();
static void placex(int); // used for placing position of X by the 1st player
static void place(); // used by the computer to place O
static void placey(int); // used in Double Player mode by the 2nd player to
// place the position of O
int checkwin(); // checks everytime when a player or computer places 'X' or 'O'
/** Tic-Tac-Toe table, so basically we are using variable 'game_table' as the table(size:3X3) and
* updating it regularly
*/
static char game_table[9];
/**
* Main program function.
* @returns 0 on clean exit.
* @note No checks are included for program execution failures!
*/
int main()
{
srand( (unsigned int)time(NULL));
int l = 0;
do
{
int n = 0;
// filling the table with multiple asterisks
for (int i = 0; i < 9; i++) game_table[i] = '*';
// displaying the main menu
printf("***************************************\n");
printf("*************TIC TAC TOE***************\n");
printf("***************************************\n");
printf("***********1. YOU vs COMPUTER ***********\n");
printf("***********2. YOU vs PLAYER ***********\n");
printf("***********3.EXIT *********************\n");
printf("Enter your choice : ");
scanf("%d", &n);
switch (n) // switch case to select between single player mode or
// double player mode
{
case 1:
singlemode();
break;
case 2:
doublemode();
break;
default:
printf("THANK YOU and EXIT!");
}
printf("Next game ? : ");
printf("Enter 1 YES and 0 - NO ");
scanf("%d", &l);
} while (l == 1);
return 0;
}
/**
* @brief Implementation of game vs computer
*
* @returns None
*/
void singlemode()
{
int m;
int k = 0;
int table_fill_count=0;
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
printf("%c ", game_table[k]);
k++;
}
printf("\n");
}
for (int x = 1; x < 10; x++)
{
k = 0;
printf("Where would you like to place 'x' ");
scanf("%d", &m);
placex(m);
if(table_fill_count<4)
{
place();
}
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
printf("%c ", game_table[k]);
k++;
}
printf("\n");
}
table_fill_count++;
int o = checkwin();
if (o == -1 || o == -2)
{
if (o == -1)
{
printf("YOU WIN\n");
}
if (o == -2)
{
printf("YOU LOSE\n");
}
break;
}
if (table_fill_count==4)
{
printf("\nDRAW ");
break;
}
}
}
/**
* @brief Implementation of game vs another player.
*
* @returns None
*/
void doublemode()
{
int m;
int e1;
int k = 0;
int doublemode_table_count=0;
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
printf("%c ", game_table[k]);
k++;
}
printf("\n");
}
for (int x = 1; x < 10; x++)
{
k = 0;
printf("PLAYER1 - where would you like to place 'x' : ");
scanf("%d", &m);
placex(m);
if(doublemode_table_count<4)
{
printf("PLAYER2 - where would you like to place 'o' : ");
scanf("%d", &e1);
placey(e1);
}
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
printf("%c ", game_table[k]);
k++;
}
printf("\n");
}
doublemode_table_count++;
int o = checkwin();
if (o == -1 || o == -2)
{
if (o == -1)
{
printf("Player 1 WIN\n");
}
if (o == -2)
{
printf("Player 2 WIN\n");
}
break;
}
if (doublemode_table_count==4)
{
printf("\nDRAW ");
break;
}
}
}
int check_placex(){
char input[50];
int n1;
while (1){
fgets(input,49,stdin);
if ( strlen(input) > 2 || strlen(input) == 0){
fprintf(stderr,"Invalid move, Enter number 1 - 9: ");
continue;
}
if(sscanf(input,"%d",&n1) != 1){
fprintf(stderr,"Invalid move, Enter number 1 - 9: ");
continue;
}
if ((game_table[n1-1] == 'x') || (game_table[n1-1]) == 'o' || (n1== 0)){
fprintf(stderr,"Already allocated, Enter number: ");
continue;
}
return n1;
}
}
/**
* @brief Update table by placing an `X`
*
* @param m location to place `X`
*
* @returns None
*/
void placex(int m)
{
int n1 = 0;
if (m >= 1 && m <= 9)
{
if (game_table[m - 1] != 'x' && game_table[m - 1] != 'o')
{
game_table[m - 1] = 'x';
}
else
{
int n = check_placex();
placex(n);
}
}
else
{
int n = check_placex();
placex(n);
}
}
/**
* @brief Update table by placing an `O`
*
* @returns None
*/
void place()
{
int e = rand() % 9;
if (e >= 0)
{
if (game_table[e] != 'x' && game_table[e] != 'o')
{
game_table[e] = 'o';
printf("\n Computer placed at %d position\n", e + 1);
}
else
{
place();
}
}
}
/**
* @brief Update table by placing an `O`
*
* @param e1 location to place `O`
*
* @returns None
*/
void placey(int e1)
{
int n1 = 0;
if (e1 >= 1 && e1 <= 9)
{
if (game_table[e1 - 1] != 'x' && game_table[e1 - 1] != 'o')
{
game_table[e1 - 1] = 'o';
}
else
{
int n = check_placex();
placex(n);
}
}
else
{
int n = check_placex();
placex(n);
}
}
/**
* @brief Implementation of win conditon checker for 'X' or 'O' whenever the table is updated
*
* @returns -1: if 'X' won
* @returns -2: if 'O' won
* @returns 0: if there is no win condition for 'X' or 'O'
*/
int checkwin()
{
if (game_table[0] == game_table[1] && game_table[1] == game_table[2])
{
if (game_table[0] == 'x' && game_table[1] == 'x' &&
game_table[2] == 'x')
{
return -1;
}
if (game_table[0] == 'o' && game_table[1] == 'o' &&
game_table[2] == 'o')
{
return -2;
}
}
else if (game_table[0] == game_table[4] && game_table[4] == game_table[8])
{
if (game_table[0] == 'x' && game_table[4] == 'x' &&
game_table[8] == 'x')
{
return -1;
}
if (game_table[0] == 'o' && game_table[4] == 'o' &&
game_table[8] == 'o')
{
return -2;
}
}
else if (game_table[0] == game_table[3] && game_table[3] == game_table[6])
{
if (game_table[0] == 'x' && game_table[3] == 'x' &&
game_table[6] == 'x')
{
return -1;
}
if (game_table[0] == 'o' && game_table[3] == 'o' &&
game_table[6] == 'o')
{
return -2;
}
}
else if (game_table[3] == game_table[4] && game_table[4] == game_table[5])
{
if (game_table[3] == 'x' && game_table[4] == 'x' &&
game_table[5] == 'x')
{
return -1;
}
if (game_table[3] == 'o' && game_table[4] == 'o' &&
game_table[5] == 'o')
{
return -2;
}
}
else if (game_table[6] == game_table[7] && game_table[7] == game_table[8])
{
if (game_table[6] == 'x' && game_table[7] == 'x' &&
game_table[8] == 'x')
{
return -1;
}
if (game_table[6] == 'o' && game_table[7] == 'o' &&
game_table[8] == 'o')
{
return -2;
}
}
else if (game_table[1] == game_table[4] && game_table[4] == game_table[7])
{
if (game_table[1] == 'x' && game_table[4] == 'x' &&
game_table[7] == 'x')
{
return -1;
}
if (game_table[1] == 'o' && game_table[4] == 'o' &&
game_table[7] == 'o')
{
return -2;
}
}
else if (game_table[2] == game_table[5] && game_table[5] == game_table[8])
{
if (game_table[2] == 'x' && game_table[5] == 'x' &&
game_table[8] == 'x')
{
return -1;
}
if (game_table[2] == 'o' && game_table[5] == 'o' &&
game_table[8] == 'o')
{
return -2;
}
}
else if (game_table[2] == game_table[4] && game_table[4] == game_table[6])
{
if (game_table[2] == 'x' && game_table[4] == 'x' &&
game_table[6] == 'x')
{
return -1;
}
if (game_table[2] == 'o' && game_table[4] == 'o' &&
game_table[6] == 'o')
{
return -2;
}
}
return 0;
}