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