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game of life

stavi93 (4)
Hello,
I am having a problem with my code here. The program does not work properly. I think the problem come from setDimension or the loop. World[a][b] does not work correctly.

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#include <iostream>
#include "Windows.h"
using namespace std;

typedef unsigned short sizeM;

class GOL
{
public:
    void setDimension(sizeM x, sizeM y);
    void printframe();
    void random();
    void grid();
    void life();


private:
    sizeM r, c;
     char **field;
     char **world;

};

void GOL::setDimension(sizeM x, sizeM y)
{
    field = new  char *[x];
    for (int i = 0; i < x; i++)
        field[i] = new  char[y];

        r = x;
        c = y;

}




void GOL::grid()
{
 int a = 0, b = 0;
 for (a = 0; a<r; a++)
 {
    for (b = 0; b<c; b++)
    {
     field[a][b] = ' ';

    }
 }

}

void GOL::printframe()
{
 for (int a = 0; a < r; a++)
 {
    for (int b = 0; b < c; b++)
    {
     if (field[a][b] == '1')
     {
        cout << '*';
     }
     else
     {
        cout << '-';
     }
    }
    cout << endl;
 }
}

void GOL::random() {
 int a,b;
 char life[2]={' ','1'};
 for (a = 0; a<r; a++)
 {
    for (b = 0; b<c; b++)
    {
     field[a][b] = life[rand() % 2];
    }
 }
}
void GOL::life()
{
 int numSurrounding = 0;

 for (int a = 0; a < r; a++)
 {
    for (int b = 0; b < c; b++)
    {
     if ((a + 1) < r && field[a + 1][b] == '1')
     {
        numSurrounding++;
     }
     if ((a - 1) >= 0 && field[a - 1][b] == '1')
     {
        numSurrounding++;
     }
     if ((b + 1) < c && field[a][b + 1] == '1')
     {
        numSurrounding++;
     }
     if ((b - 1) >= 0 && field[a][b - 1] == '1')
     {
        numSurrounding++;
     }
     if ((a + 1) < r && (b + 1) < c && field[a + 1][b + 1] == '1')
     {
        numSurrounding++;
     }
     if ((a + 1) < r && (b - 1) >= 0 && field[a + 1][b - 1] == '1')
     {
        numSurrounding++;
     }
     if ((a - 1) >= 0 && (b + 1) < c && field[a - 1][b + 1] == '1')
     {
        numSurrounding++;
     }
     if ((a - 1) >= 0 && (b - 1) >= 0 && field[a - 1][b - 1] == '1')
     {
        numSurrounding++;
     }

     if (numSurrounding < 2 || numSurrounding > 3)
     {
        world[a][b] = '-';
     }
     if (numSurrounding == 2)
     {
        world[a][b] = '1';
     }
     if (numSurrounding == 3)
     {
        world[a][b] = '1';
     }
     numSurrounding = 0;
    }
 }

 for (int a = 0; a < r; a++)
 {
    for (int b = 0; b < c; b++)
    {
     field[a][b] = world[a][b];
    }
 }
}

int main()
{
 {
    GOL gol;
    sizeM rows, cols;
    cout << "Enter a dimension of your choice" << endl << "-mxn-" << endl;
    cin >> rows >> cols;
    gol.setDimension(rows, cols);
    gol.grid();
    gol.random();
    gol.printframe();
    Sleep(1000);

    do
    {
     cout << "==============================================================" << endl;
     gol.life();
     gol.printframe();
     Sleep(1000);
    } while (true);
    return 0;
 }


 system("pause");
}



I appreciate any help.
Special thanks to whitenite1!!!
Last edited on
wildblue (1505)
prog.cpp: In member function ‘void GOL::random()’:
prog.cpp:75:26: error: ‘rand’ was not declared in this scope
             int x = rand() % 2;
                          ^


You need to include the header that contains the rand function. You might also want to seed the random function at the beginning of main so you don't get the same random number each time.

Last edited on
games4thefuture (4)
Look at this page for more information.

http://www.cplusplus.com/reference/cstdlib/rand/
stavi93 (4)
i have added now:
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2
 
#include "cstdlib"
#include "time.h"

and wrote
srand(time(NULL));
in the beginning of the code.
Now i am getting different random number but the program still wont continue in the loop.

edit: the debugger is showing me that in these lines something goes wrong:
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5
 
		
	if (numSurrounding < 2 || numSurrounding > 3)
		{
			world[a][b] = '-';
		}
Last edited on
doug4 (1535)
You didn't say what was going wrong with those lines. A better description would help us debug your problems.

However, I think you can find your problem by comparing lines 57 and 77 (0 vs. 1) with lines 45, 91 (etc.), 126 and 134 (' ', '-', and '*'). You are inconsistent with how you represent a living cell.
stavi93 (4)
Thanks for the answer.
The problem is i dont know what is wrong with the lines. VS13 is showing me an arrow on line 126 with the note "memory cannot be read" (translated).
whitenite1 (1785)
@stavi93

The main problem I saw, was that you never created a world. So, the program stopped when trying to access it. I fiddled with your code, and it seems to be working now. You may want to use a gotoXY() function to start drawing the colony always in the same place, so the screen doesn't scroll, or, use a clearscreen() function. Anyway, here's the code I corrected.

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// Life.cpp : main project file.

#include <iostream>
#include "cstdlib"
#include "time.h" 
#include <Windows.h>

using namespace std;

typedef unsigned short sizeM;

class GOL
{
public:
 void setDimension(sizeM x, sizeM y);
 void printframe();
 void random();
 void grid();
 void life();


private:
 sizeM r, c;
 char **field;
 char **world;

};

void GOL::setDimension(sizeM x, sizeM y)
{
 field = new  char *[x];
 world = new  char *[x];
 for (int i = 0; i < x; i++)
 {
	field[i] = new  char[y];
	world[i] = new  char[y];
 }
 r = x;
 c = y;
}

void GOL::grid()
{
 int a = 0, b = 0;
 for (a = 0; a<r; a++)
 {
	for (b = 0; b<c; b++)
	{
	 field[a][b] = ' ';
	 world[a][b] = ' ';
	}
 }

}

void GOL::printframe()
{
 for (int a = 0; a < r; a++)
 {
	for (int b = 0; b < c; b++)
	{
	 if (field[a][b] == '1')
	 {
		cout << '*';
	 }
	 else
	 {
		cout << '-';
	 }
	}
	cout << endl;
 }
}

void GOL::random() {
 int a,b;
 char life[2]={' ','1'};
 for (a = 0; a<r; a++)
 {
	for (b = 0; b<c; b++)
	{
	 field[a][b] = life[rand() % 2];
	}
 }
}

void GOL::life()
{
 int numSurrounding = 0;

 for (int a = 0; a < r; a++)
 {
	for (int b = 0; b < c; b++)
	{
	 if ((a + 1) < r && field[a + 1][b] == '1')
	 {
		numSurrounding++;
	 }
	 if ((a - 1) >= 0 && field[a - 1][b] == '1')
	 {
		numSurrounding++;
	 }
	 if ((b + 1) < c && field[a][b + 1] == '1')
	 {
		numSurrounding++;
	 }
	 if ((b - 1) >= 0 && field[a][b - 1] == '1')
	 {
		numSurrounding++;
	 }
	 if ((a + 1) < r && (b + 1) < c && field[a + 1][b + 1] == '1')
	 {
		numSurrounding++;
	 }
	 if ((a + 1) < r && (b - 1) >= 0 && field[a + 1][b - 1] == '1')
	 {
		numSurrounding++;
	 }
	 if ((a - 1) >= 0 && (b + 1) < c && field[a - 1][b + 1] == '1')
	 {
		numSurrounding++;
	 }
	 if ((a - 1) >= 0 && (b - 1) >= 0 && field[a - 1][b - 1] == '1')
	 {
		numSurrounding++;
	 }

	 if (numSurrounding < 2 || numSurrounding > 3)
	 {
		world[a][b] = '-';
	 }
	 if (numSurrounding == 2)
	 {
		world[a][b] = '1';
	 }
	 if (numSurrounding == 3)
	 {
		world[a][b] = ' ';
	 }
	 numSurrounding = 0;
	}
 }

 for (int a = 0; a < r; a++)
 {
	for (int b = 0; b < c; b++)
	{
	 field[a][b] = world[a][b];
	}
 }
}

int main()
{
 {
	GOL gol;
	sizeM rows, cols;
	srand((unsigned) time(0));
	cout << "Enter a dimension of your choice" << endl << "-mxn-" << endl;
	cin >> rows >> cols;
	gol.setDimension(rows, cols);
	gol.grid();
	gol.random();
	gol.printframe();
	Sleep(1000);

	do
	{
	 cout << "==============================================================" << endl;
	 gol.life();
	 gol.printframe();
	 Sleep(1000);
	} while (true);
	return 0;
 }


 system("pause");
}
stavi93 (4)
Thanks for your help and your suggestions, I really appreciate it .
Now i am able to improve it.
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