4.32 Tic-Tac-Toe Functions

// TicTacToe.cpp   
// for CS 141 lab 4
// Password: Brown
// 
#include <iostream>
using namespace std;


//----------------------------------------------------------------------------------
// Display the board.
// HINT: Supply parameters for all the board position variables.
// *** In the line below supply the return type and any needed parameters.
void displayBoard(char p1,char p2,char p3,char p4,char p5,char p6,char p7,char p8,char p9)
{
	cout << endl
		 << "------- \n"
	     << "|" << p1 << "|" << p2 << "|" << p3 << "|   1  2  3\n"
	     << "------- \n"
	     << "|" << p4 << "|" << p5 << "|" << p6 << "|   4  5  6\n"
	     << "------- \n"
	     << "|" << p7 << "|" << p8 << "|" << p9 << "|   7  8  9\n"
	     << "------- \n" 
	     << endl;
} // end displayBoard(...)


//----------------------------------------------------------------------------------
// Make a move by placing the correct character at the position indicated by the user.
// HINT: An ampersand '&' must be placed between a parameter type and the
// parameter name if you want changes to that parameter to be reflected back to 
// the calling code in main( ). 
// *** In the line below supply the return type and any needed parameters.
void makeMove(int position, char pieceToMove, char& p1, char& p2, char& p3, char& p4, char& p5, char& p6, char& p7, char& p8, char& p9)
{
   	// Make move
		switch (position) {
			case 1: p1 = pieceToMove; break;
			case 2: p2 = pieceToMove; break;
			case 3: p3 = pieceToMove; break;
			case 4: p4 = pieceToMove; break;
			case 5: p5 = pieceToMove; break;
			case 6: p6 = pieceToMove; break;
			case 7: p7 = pieceToMove; break;
			case 8: p8 = pieceToMove; break;
			case 9: p9 = pieceToMove; break;
		}
}// end makeMove(...)


//----------------------------------------------------------------------------------
// After every move check the board for a winning condition.
// E.g. If the top row variables all have the same character
// (in positions 1,2 and 3) then there would be a win. If a winning  
// condition is found, return true, else return false.
// Check for win using board positions:
//    1 2 3
//    4 5 6
//    7 8 9
// *** In the line below supply the return type and any needed parameters.
bool thereIsAWin(char p1,char p2,char p3,char p4,char p5,char p6,char p7,char p8,char p9)
{
	// if winning condition found then set win = true
	bool win = false;
	if( (p1==p2 && p2==p3 && p3!=' ') ||  // top row
		 (p4==p5 && p5==p6 && p6!=' ') ||  // middle row
		 (p7==p8 && p8==p9 && p9!=' ') ||  // bottom row
		 (p1==p4 && p4==p7 && p7!=' ') ||  // left column
		 (p2==p5 && p5==p8 && p8!=' ') ||  // middle column
		 (p3==p6 && p6==p9 && p9!=' ') ||  // right column
		 (p1==p5 && p5==p9 && p9!=' ') ||  // upper-left to lower-right diagonal
		 (p7==p5 && p5==p3 && p3!=' ')     // lower-left to upper-right diagonal
     ){
		   win = true;
      }
   return win;
} // end thereIsAWin(...)


//----------------------------------------------------------------------------------
// Check whether the move position entered is valid, returning true or false.
// Receive parameters for the move position and all the board pieces.
// If the intended destination is already occupied or the selected
// move position is not between 1..9 (inclusive) then return false.
// *** In the line below supply the return type and any needed parameters and uncomment it.
bool moveIsValid(int position,char p1,char p2,char p3,char p4,char p5,char p6,char p7,char p8,char p9 )
{  
   bool tempBool = true;
   switch (position) {
			case 1: tempBool = p1 == ' '? true:false; break;
			case 2: tempBool = p2 == ' '? true:false; break;
			case 3: tempBool = p3 == ' '? true:false; break;
			case 4: tempBool = p4 == ' '? true:false; break;
			case 5: tempBool = p5 == ' '? true:false; break;
			case 6: tempBool = p6 == ' '? true:false; break;
			case 7: tempBool = p7 == ' '? true:false; break;
			case 8: tempBool = p8 == ' '? true:false; break;
			case 9: tempBool = p9 == ' '? true:false; break;
		}
   return (position > 0 && position < 10 && tempBool);
} // end moveIsValid(...)


//----------------------------------------------------------------------------------
int main()
{
   
   // ***Declare and initialize variables
   // Initialize the board variables. Replace ? with the correct type in the statements below.
   char p1,p2,p3,
        p4,p5,p6,
        p7,p8,p9; 
	  p1=p2=p3=p4=p5=p6=p7=p8=p9= ' ';
	char pieceToMove = 'X';           // 'X' gets the first move
	int position = 0;
	int moveNumber = 1;
	     
	cout << "Welcome to the TicTacToe game!                  \n"
	     << "Take turns entering the move destination (1..9) \n"  
	     << "or '0' (zero) to exit." 
	     << endl;

	// Main loop
	while( moveNumber <= 9) {      // if winning condition not found the game stops after 9 moves
	
	   // *** Fix the call to function displayBoard in the line below, and uncomment it.
	   displayBoard(p1,p2,p3,p4,p5,p6,p7,p8,p9);
   
		// Prompt for and get move.  
		cout << moveNumber << ". Enter the move (1..9) for " << pieceToMove << ": ";
		cin >> position;       // the position at which the move is made
	   
		// See if 0 was entered, indicating the desire to exit the program
		if( position == 0) {
		   // 0 was entered. Break out of enclosing loop, to exit the program.
		   break;
		}
		
		// Validate intended move.  If move is not valid, give a message and loop back up to retry.
		// *** Correct the line below where function moveIsValid(...) is called, and uncomment the section.
		if( ! moveIsValid(position,p1,p2,p3,p4,p5,p6,p7,p8,p9) ) {
		   cout << "That move is not valid.  Retry.";
		   continue;
	   }
		
		
	   // Make the move, placing the character on the board.  
	   // *** Add any needed parameters to function makeMove( ...) below and uncomment it.
    	 makeMove(position, pieceToMove, p1, p2, p3, p4,  p5, p6, p7, p8, p9);        
      
		// *** Add any needed parameters below to function thereIsAWin(...). 
      if( thereIsAWin(p1,p2,p3,p4,p5,p6,p7,p8,p9) ) {        // if win was detected then the game stops
         // After a win again display the board.
         // *** Fix the call to function displayBoard(...) in the line below, and uncomment it.
         displayBoard(p1,p2,p3,p4,p5,p6,p7,p8,p9);
         cout << endl 
		     << "Congratulations player " << pieceToMove << ". You WON!" << endl;
          break;
      }
   
	   // Change to the other piece for next move.  
	   if( pieceToMove == 'X') {
		   pieceToMove = 'O';
	   }
	   else {
		   pieceToMove = 'X';
	   }

	   moveNumber++;
	} // end 	while( moveNumber

	cout << "Exiting program..." << endl;
	return 1;

} // end main()