#include<iostream>
#include"life.h"
using namespace std;
int Life::neighbor_count(int row, int col)
/* Pre: The Life object contains a configuration, and the coordinates row and col
define a cell inside its hedge.
Post: The number of living neighbors of the specified cell is returned. */
{
int i, j;
int count = 0;
for (i = row - 1; i <= row + 1; i++)
for (j = col - 1; j <= col + 1; j++)
count += grid[i][j]; // Increase the count if neighbor is alive.
count -= grid[row][col]; // Reduce count, since cell is not its own neighbor.
return count;
}
void Life::update()
/* Pre: The Life object contaions a configuration.
Post: The Life object contains the next generation of configuration. */
{
int row, col;
int new_grid[maxrow + 2][maxcol + 2];
for(row = 1; row <= maxrow; row++)
for(col = 1; col <= maxcol; col++)
switch (neighbor_count(row, col))
{
case 2: new_grid[row][col] = grid[row][col]; // Status stays the same.
break;
case 3: new_grid[row][col] = 1; // cell is now alive.
break;
default:
new_grid[row][col] = 0; // cell is now dead.
}
for (row = 1; row <= maxrow; row++)
for (col = 1; col <= maxcol; col++)
grid[row][col] = new_grid[row][col];
}
void Life::initialize()
/* Pre: None
Post: The Life object contains a configuration specified by the user. */
{
int row, col;
for (row = 0; row <= maxrow + 1; row++)
for (col = 0; col <= maxcol + 1; col++)
grid[row][col] = 0;
cout << "List the coordinates for living cells." << endl;
cout << "Terminate the list with the special pair - 1 - 1" << endl;
cin >> row >> col;
while (row != -1 || col != -1)
{
if (row >= 1 && row <= maxrow)
if (col >= 1 && col <= maxcol)
grid[row][col] = 1;
else
cout << "Column" << col << " is out of range." << endl;
else
cout << "Row" << row << " is out of range." << endl;
cin >> row >> col;
}
}
void Life::print()
/* Pre: The Life object contains a configuration.
Post: The configuration is written for the user. */
{
int row, col;
cout << "\n" << endl;
for (row = 1; row <= maxrow; row++)
{
for (col = 1; col <= maxcol; col++)
if (grid[row][col] == 1)
cout << '*';
else
cout << ' ';
cout << endl;
}
cout << endl;
}
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