Public snipts » lijamez's snipts » Conway's Game of Life in C++

• #include <iostream>
  using namespace std;
  
  //The Grid class of the game of life. The grid is a 2D array.
  class Grid {
  	int width, height;
  	bool grid [1000][1000];
  public:
  	Grid(int, int);
  	void nextFrame();
  	void printFrame();
  };
  
  Grid::Grid(int a, int b) {
  	height = a;
  	width = b;
  	
  	//Presets of alive cells. Change these to whatever you wish.
  	grid[0][1] = true;
  	grid[1][2] = true;
  	grid[2][0] = true;
  	grid[2][1] = true;
  	grid[2][2] = true;
  	
  }
  
  /**
   Checks how many surrounding cells are alive for a cell and changes it depending on the game of life rules.
   The changes are stored in a temporary 2D array. Then, it is copied to the main grid array. 
  **/
  void Grid::nextFrame() {
  	
  	int numSurrounding = 0;
  	bool tempGrid [height][width];
  	
  	for (int i = 0; i < height ; i++)
  	{
  		for (int j = 0; j < width ; j++)
  		{
  			if ( (i+1) < height && grid[i + 1][j] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i-1) >= 0 && grid[i - 1][j] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (j+1) < width && grid[i][j+1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (j-1) >= 0 && grid[i][j-1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i+1) < height && (j+1) < width && grid[i+1][j+1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i+1) < height && (j-1) >= 0 && grid[i+1][j-1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i-1) >= 0 && (j+1) < width && grid[i-1][j+1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i-1) >= 0 && (j-1) >= 0 && grid[i-1][j-1] == true )
  			{
  				numSurrounding++;
  			}
  			
  			if (numSurrounding < 2 || numSurrounding > 3)
  			{
  				tempGrid[i][j] = false;
  			}
  			else if (numSurrounding == 2)
  			{
  				tempGrid[i][j] = grid[i][j];
  			}
  			else if (numSurrounding == 3)
  			{
  				tempGrid[i][j] = true;
  			}
  			
  			numSurrounding = 0;
  			
  		}
  	}
  	
  	for (int i = 0 ; i < height ; i++ )
  	{
  		for (int j = 0 ; j < width ; j++ )
  		{
  			grid[i][j] = tempGrid[i][j];
  		}
  	}
  }
  
  //Prints the grid into the console.
  void Grid::printFrame() {
  	for (int i = 0; i < height ; i++ )
  	{
  		for (int j = 0 ; j < width ; j++ )
  		{
  			if ( grid[i][j] == true )
  			{
  				cout << "x";
  			}
  			else
  			{
  				cout << " ";
  			}
  			
  			if ( (j + 1) >= width )
  			{
  				cout << endl;
  			}
  		}
  	}
  }
  
  
  int main () {	
  	int inputHeight, inputWidth;
  	string kbd;
  
  	cout << "The Game of Life in C++ by James Li\n\n" ;
  	cout << "How many rows? (up to 1000)" << endl;
  	cin >> inputHeight;
  	cout << "How many columns? (up to 1000)" << endl;
  	cin >> inputWidth;
  	
  	Grid life(inputHeight, inputWidth);
  	life.printFrame();
  	cout << endl;
  	
  	do {
  		kbd = "";
  		cout << "Enter \"y\" for next cycle, anything else to quit... ";
  		cin >> kbd;
  		cout << endl;
  		
  		life.nextFrame();
  		life.printFrame();
  		cout << endl;
  	} while (kbd == "y");
  	
  	cout << "Goodbye." << endl;
  	
  	return 0;
  }
  

  cpp

  1

  #include <iostream>
  using namespace std;
  
  //The Grid class of the game of life. The grid is a 2D array.
  class Grid {
  	int width, height;
  	bool grid [1000][1000];
  public:
  	Grid(int, int);
  	void nextFrame();
  	void printFrame();
  };
  
  Grid::Grid(int a, int b) {
  	height = a;
  	width = b;
  	
  	//Presets of alive cells. Change these to whatever you wish.
  	grid[0][1] = true;
  	grid[1][2] = true;
  	grid[2][0] = true;
  	grid[2][1] = true;
  	grid[2][2] = true;
  	
  }
  
  /**
   Checks how many surrounding cells are alive for a cell and changes it depending on the game of life rules.
   The changes are stored in a temporary 2D array. Then, it is copied to the main grid array. 
  **/
  void Grid::nextFrame() {
  	
  	int numSurrounding = 0;
  	bool tempGrid [height][width];
  	
  	for (int i = 0; i < height ; i++)
  	{
  		for (int j = 0; j < width ; j++)
  		{
  			if ( (i+1) < height && grid[i + 1][j] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i-1) >= 0 && grid[i - 1][j] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (j+1) < width && grid[i][j+1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (j-1) >= 0 && grid[i][j-1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i+1) < height && (j+1) < width && grid[i+1][j+1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i+1) < height && (j-1) >= 0 && grid[i+1][j-1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i-1) >= 0 && (j+1) < width && grid[i-1][j+1] == true )
  			{
  				numSurrounding++;
  			}
  			if ( (i-1) >= 0 && (j-1) >= 0 && grid[i-1][j-1] == true )
  			{
  				numSurrounding++;
  			}
  			
  			if (numSurrounding < 2 || numSurrounding > 3)
  			{
  				tempGrid[i][j] = false;
  			}
  			else if (numSurrounding == 2)
  			{
  				tempGrid[i][j] = grid[i][j];
  			}
  			else if (numSurrounding == 3)
  			{
  				tempGrid[i][j] = true;
  			}
  			
  			numSurrounding = 0;
  			
  		}
  	}
  	
  	for (int i = 0 ; i < height ; i++ )
  	{
  		for (int j = 0 ; j < width ; j++ )
  		{
  			grid[i][j] = tempGrid[i][j];
  		}
  	}
  }
  
  //Prints the grid into the console.
  void Grid::printFrame() {
  	for (int i = 0; i < height ; i++ )
  	{
  		for (int j = 0 ; j < width ; j++ )
  		{
  			if ( grid[i][j] == true )
  			{
  				cout << "x";
  			}
  			else
  			{
  				cout << " ";
  			}
  			
  			if ( (j + 1) >= width )
  			{
  				cout << endl;
  			}
  		}
  	}
  }
  
  
  int main () {	
  	int inputHeight, inputWidth;
  	string kbd;
  
  	cout << "The Game of Life in C++ by James Li\n\n" ;
  	cout << "How many rows? (up to 1000)" << endl;
  	cin >> inputHeight;
  	cout << "How many columns? (up to 1000)" << endl;
  	cin >> inputWidth;
  	
  	Grid life(inputHeight, inputWidth);
  	life.printFrame();
  	cout << endl;
  	
  	do {
  		kbd = "";
  		cout << "Enter \"y\" for next cycle, anything else to quit... ";
  		cin >> kbd;
  		cout << endl;
  		
  		life.nextFrame();
  		life.printFrame();
  		cout << endl;
  	} while (kbd == "y");
  	
  	cout << "Goodbye." << endl;
  	
  	return 0;
  }
  

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