ticactoe.c

#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>

void printBoard(char board[3][3])
{

  printf("\n\n\n %c | %c | %c \n", board[0][0], board[0][1], board[0][2] );
  printf("---+---+---\n");
  printf(" %c | %c | %c \n", board[1][0], board[1][1], board[1][2] );
  printf("---+---+---\n");
  printf(" %c | %c | %c \n", board[2][0], board[2][1], board[2][2] );
 
}

void resetBoard(char board[3][3]) 
{
  for(int i=0; i < 3; i++)
  {
    for(int j=0; j < 3; j++){
      board[i][j] = ' ';
    }
  }
}

int getnum(numchar,num)
{
  while(true){
    printf("what %c value? \n",numchar);
    scanf("%d",&num);
  
      if(num>3){
        printf("That doesnt exist silly \n");
        continue;
      } else {
        break;
      }
    }
  return num;
}

void placeInput(char board[3][3],int x,int y, char player, char computer)
{
  srand(time(0));
  board[y][x] = player;
  int computer_x,computer_y;

  //the "computer" is 2 random numbers, checks that chosen space is empty
   while(true){
     computer_y = rand() % 3;
     computer_x = rand() % 3;
    
     if(board[computer_y][computer_x] != ' '){
       continue;
     } else {
       board[computer_y][computer_x] = computer;
       break;
     }
    }
}

//brute forces through the winstates
bool checkWin(char board[3][3], char player)
{
  bool threeIn_a_Row = false;
  for(int i = 0; i<3; i++){
    if (board[i][0] == player && board[i][1] == player && board[i][2] == player){
      threeIn_a_Row = true;
      break;
    }
    else if(board[0][i] == player && board[1][i] == player && board[2][i] == player){
      threeIn_a_Row = true;
      break; 
    }
    else if (board[0][0] == player && board[1][1] == player && board[2][2] == player){
      threeIn_a_Row = true;
      break;    
    }
    else if (board[2][0] == player && board[1][1] == player && board[0][2] == player){
      threeIn_a_Row = true;
      break;
    } 
    else{
      continue;
    }
  }
  return threeIn_a_Row;
}

int main() {
  
  char restart;
  char board[3][3];
  const char player = '0';
  const char computer = 'X';
  char reset;
  int X,Y;
  bool gameover = false;

  resetBoard(board);
  printBoard(board);
  
  while(true){
    X = getnum('X',X)-1;
    Y = getnum('Y',Y)-1;

    //doesnt allow the player to play on an occupied space
    while(true){
      if(board[Y][X] != ' '){
        printf("That spot is taken !\n");
        X = getnum('X',X)-1;
        Y = getnum('Y',Y)-1;
      }else{
        break;
      }
    }

    placeInput(board,X,Y,player,computer);
    printBoard(board);

    if (checkWin(board,computer)){
      printf("COMPUTER WINS!!\n");
      gameover = true;
    } 
    else if (checkWin(board,player)){
      printf("PLAYER WINS!!\n");
      gameover = true;
    }
   
    if(gameover){
      printf("(R) to play again and anything else to quit :\n");
      scanf("%s", &restart);
      
      if(toupper(restart) == 'R'){
          gameover = false;
          resetBoard(board);
          printBoard(board);
          continue;
      } else{
        break;
      }
    }
  }
  return 0;
}