Conway\'s Game of Life You can learn all about the Game of Life at http://en.wik
ID: 3815938 • Letter: C
Question
Conway's Game of Life
You can learn all about the Game of Life at http://en.wikipedia.org/wiki/Conway's_Game_of_Life (Links to an external site.). The Game of Life is a cellular automaton devised by the British mathematician John Horton Conway in 1970. The "game" is a zero-player game, meaning that its evolution is determined by its initial state, requiring no further input. One interacts with the Game of Life by creating an initial configuration and observing how it evolves, or, for advanced "players", by creating patterns with particular properties.
In this assignment, you are to implement the four member functions listed below of the provided GameOfLife class. You should implement these member functions in a source file you create, call it GameOfLifeStudent.cpp (yes, that means the implementation of the class member functions will be split across two .cpp files!). The rest of the class and main program code are provided for you: GameOfLife.h GameOfLife.cpp GameOfLifeMain.cpp
Here are the member functions you must implement:
1) void initFromFile(string fileName);
Initialize your current[ROWS][COLS] member variable with the game defined in the file with the provided file name. The file format is ROWSxCOLS of space-separated 1s and 0s (true and false). Make sure to count up and initialize your population as you read this in from file. Some example game input files:
stationaryGame.txt oscillatorsGame.txt spaceshipsGame.txt gliderGunGame.txt
2) int countNeighbors(int row, int col);
Given a position in the grid (row, col), use for loops to count and return how many live cells there are around you (do not count yourself). Take care to stay within the bounds of the array, specifically on edges/corners of the grid!
3) void updateNext(void);
Update the next[ROWS][COLS] member variable by looking at current[ROWS][COLS] and applying the following rules:
Any live cell with fewer than two live neighbors dies, as if caused by under-population.
Any live cell with two or three live neighbors lives on to the next generation.
Any live cell with more than three live neighbors dies, as if by overcrowding.
Any dead cell with exactly three live neighbors becomes a live cell, as if by reproduction.
Also make sure to update the population member variable any time a cell dies or a new cell is born.
4) void copyFromNextIntoCurrent(void);
Calling this function should overwrite the contents of current[ROWS][COLS] with those stored inside next[ROWS][COLS].
What you need to do
Download the provided source code (GameOfLife.h GameOfLife.cpp GameOfLifeMain.cpp)
Create a new file GameOfLifeStudent.cpp (don't forget your jarvis file header!!)
Implement the four member functions listed above that are defined in GameOfLife.h inside of your GameOfLifeStudent.cpp file
Add all of the files to your project in your IDE and build (you should have 4 files)
Run using the provided test cases on your machine
Upload and check your GameOfLifeStudent.cpp on Jarvis
Turn in only your GameOfLifeStudent.cpp file
Afterwards, have some fun: https://bitstorm.org/gameoflife/lexicon/#zj (Links to an external site.)
Your code must compile with zero errors and zero warnings and execute with zero differences from the expected results on Jarvis in order to receive full credit for this assignment.
GameOfLifeMain.cpp(
)
GameOfLife.h(
)
GameOfLife.h(
gliderGunGame.txt(
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spaceshipsGame.txt(
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)
oscillatorsGame.txt(
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stationaryGame.txt(
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)
Explanation / Answer
Below are the four required methods to be copied into your ...Student.cpp file.
#include<fstream>
#include<string>
#include "GameOfLife.h"
using namespace std;
//Set the initial state of the game of life
void GameOfLife::initFromFile(string fileName)
{
ifstream ifl;
ifl.open(fileName.c_str()); //open file for reading, converting string variable 'filename' to char* for passing to .open()
int charlie; //each cell in the array (one person in the game)
for (int row = 0; row < ROWS; row++)
{
for (int col = 0; col < COLS; col++)
{
ifl>>charlie; //read one cell from the file into charlie
if(charlie)
{
current[row][col] = true;
population++;
}
else
current[row][col] = false;
}
}
generations++;
ifl.close();
}
//Count how many alive neighbors a cell has
int GameOfLife::countNeighbors(int row, int col)
{ //didn't see the need to use loops
int NeighCount=0; //count of neighbours
if(row==0) //if cell is in the first row
{
if(col==0) //if cell is in the first row and first column (first cell)
{
if(current[row+1][col]==true) //check cell directly below
NeighCount++;
if(current[row+1][col+1]==true) //check cell diagonally right below
NeighCount++;
if(current[row][col+1]==true) //check cell to the right
NeighCount++;
}
else if(col==COLS-1) //if cell is in the first row, last column
{
if(current[row+1][col]==true) //check cell directly below
NeighCount++;
if(current[row+1][col-1]==true) //check cell diagonally left below
NeighCount++;
if(current[row][col-1]==true) //check cell to the left
NeighCount++;
}
else //if cell is in the 1st row but not the first nor last column
{
if(current[row+1][col]==true) //check cell directly below
NeighCount++;
if(current[row+1][col+1]==true) //check cell diagonally right below
NeighCount++;
if(current[row][col+1]==true) //check cell to the right
NeighCount++;
if(current[row+1][col-1]==true) //check cell diagonally left below
NeighCount++;
if(current[row][col-1]==true) //check cell to the left
NeighCount++;
}
}
else if(row==ROWS-1) //if cell is in the last row
{
if(col==0) //if cell is in the last row and first column
{
if(current[row-1][col]==true) //check cell directly above
NeighCount++;
if(current[row-1][col+1]==true) //check cell diagonally right above
NeighCount++;
if(current[row][col+1]==true) //check cell to the right
NeighCount++;
}
else if(col==COLS-1) //if cell is in the last row, last column (last cell)
{
if(current[row-1][col]==true) //check cell directly above
NeighCount++;
if(current[row-1][col-1]==true) //check cell diagonally left above
NeighCount++;
if(current[row][col-1]==true) //check cell to the left
NeighCount++;
}
else //if cell is in the last row but not the first nor last column
{
if(current[row-1][col]==true) //check cell directly above
NeighCount++;
if(current[row-1][col+1]==true) //check cell diagonally right above
NeighCount++;
if(current[row][col+1]==true) //check cell to the right
NeighCount++;
if(current[row-1][col-1]==true) //check cell diagonally left above
NeighCount++;
if(current[row][col-1]==true) //check cell to the left
NeighCount++;
}
} // end if- first and last row cells considered here, now check 1st and last columns
else if(col==0) //if cell is in 1st column but not the first row nor last row
{
if(current[row-1][col]==true) //check cell directly above
NeighCount++;
if(current[row-1][col+1]==true) //check cell diagonally right above
NeighCount++;
if(current[row][col+1]==true) //check cell to the right
NeighCount++;
if(current[row+1][col+1]==true) //check cell diagonally right below
NeighCount++;
if(current[row+1][col]==true) //check cell directly below
NeighCount++;
}
else if(col==COLS-1) //if cell is in last column but not the first row nor last row
{
if(current[row-1][col]==true) //check cell directly above
NeighCount++;
if(current[row-1][col-1]==true) //check cell diagonally left above
NeighCount++;
if(current[row][col-1]==true) //check cell to the left
NeighCount++;
if(current[row+1][col-1]==true) //check cell diagonally left below
NeighCount++;
if(current[row+1][col]==true) //check cell directly below
NeighCount++;
}
else //if cell is not in the first nor last row, nor first or last column (inner cells)
{
if(current[row-1][col]==true) //check cell directly above
NeighCount++;
if(current[row-1][col-1]==true) //check cell diagonally left above
NeighCount++;
if(current[row][col-1]==true) //check cell to the left
NeighCount++;
if(current[row+1][col-1]==true) //check cell diagonally left below
NeighCount++;
if(current[row+1][col]==true) //check cell directly below
NeighCount++;
if(current[row+1][col+1]==true) //check cell diagonally right below
NeighCount++;
if(current[row][col+1]==true) //check cell to the right
NeighCount++;
if(current[row-1][col+1]==true) //check cell diagonally right above
NeighCount++;
}
return NeighCount; //return no of neighbours of the cell
}
//Update the game of life based on rules from assignment description
void GameOfLife::updateNext(void)
{
int Neighbours;
//assign current array to next generation
for (int row = 0; row < ROWS; row++)
for (int col = 0; col < COLS; col++)
next[row][col]=current[row][col];
//update next generation
for (int row = 0; row < ROWS; row++)
{
for (int col = 0; col < COLS; col++)
{
Neighbours=countNeighbors(row,col); //get count of current cell's live neighbours
if(next[row][col]) //if cell is true, ie- charlie is alive
{
if(Neighbours<2 || Neighbours>3)
next[row][col]=false; //cell dies due to over or under crowding
}
else //if cell is false,
{
if(Neighbours==3) //dead cell has 3 neighbours
next[row][col]=true; //make cell live
}
}
}
}
//Copy the contents of next[][] into current[][]
void GameOfLife::copyFromNextIntoCurrent(void)
{
population=0; //reset population
for (int row = 0; row < ROWS; row++)
for (int col = 0; col < COLS; col++)
{
current[row][col]=next[row][col];
if(current[row][col]==true)
population++; //increment population if cell is alive
}
generations++; //increment generations counter
}
Hope this helps!