Game Of Life help? Ive done most of it

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Game Of Life help? Ive done most of it

 
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  #1
Aug 26th, 2008
Hey can someone help me finish my code? Im in a real stump here.


What Ive done so far is read and display the code from a 2d array, then I counted the neighbours that were dead and then did the process to make a new Generation.

However, I dont think Ive done it completely right. Like, how would I tell the function how many times I need to make the new generation, then display it?

Im so lost :s
C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  4.  
  5. using namespace std;
  6.  
  7. const int SIZE = 20;
  8. bool readGrid(string fileName, char grid[SIZE][SIZE]);
  9. void displayGrid(const char grid[SIZE][SIZE]);
  10.  
  11.  
  12.  
  13. int countAlive(char grid[SIZE][SIZE]);
  14.  
  15. void newGen(char grid[SIZE][SIZE]);
  16.  
  17.  
  18.  
  19.  
  20. // declare more functions if necessary
  21.  
  22. int main()
  23. {
  24.     string fileName;        // the name of the grid file
  25.     int nGenerations;    // nGenerations is the number of generations
  26.     char grid[SIZE][SIZE];  // a char array consiting of '*' or '.'
  27.     // declare more variables if necessary
  28.  
  29.     char nuevo[SIZE][SIZE];
  30.  
  31.     cout << "Enter the filename of the grid: " << flush;            // don't modify
  32.     cin >> fileName;                                                // don't modify
  33.     cout << endl;                                                   // don't modify
  34.  
  35.     readGrid(fileName, grid);
  36.     displayGrid(grid);
  37.  
  38.     // add processing for reading and displaying the grid
  39.  
  40.     cout << endl << "How many generations in total? " << flush;     // don't modify
  41.     cin >> nGenerations;                                            // don't modify
  42.  
  43.  
  44.     // add processing for new grid generations
  45.  
  46.     if (nGenerations == 1)                                                                  // don't modify
  47.       cout << "This is the grid after " << nGenerations << " generation:" << endl << endl;  // don't modify
  48.     else                                                                                    // don't modify
  49.       cout << "This is the grid after " << nGenerations << " generations:" << endl << endl; // don't modify
  50.  
  51.  
  52.  
  53.     // display the grid
  54.  
  55.     cout << endl;            // don't modify
  56.     system("pause");         // don't modify
  57.     return 0;                // don't modify
  58. }
  59.  
  60. // implement all declared functions
  61.  
  62.  
  63.  
  64.  
  65.  
  66. bool readGrid(string fileName, char grid[SIZE][SIZE])
  67. {
  68.      ifstream inData;
  69.  
  70.      inData.open(fileName.c_str());
  71.  
  72.      if(inData)
  73.      {
  74.      for(int row = 0; row < SIZE; row++)
  75.      {
  76.              for(int col = 0; col < SIZE; col++)
  77.              {
  78.                      inData >> grid[row][col];
  79.              }
  80.              } 
  81.              return true;    } 
  82.              else
  83.              return false;
  84.  
  85. }
  86.  
  87.  
  88.  
  89.  
  90.  
  91. void displayGrid(const char grid[SIZE][SIZE])
  92. {
  93.      for(int row = 0; row < SIZE; row++)
  94.      {
  95.              for(int col = 0; col < SIZE; col++)
  96.              {
  97.                      cout << grid[row][col] << " ";
  98.              }
  99.      cout << endl;
  100.      }
  101. }
  102.  
  103.  
  104.  
  105.  
  106.  
  107.  
  108.  
  109. int countAlive(char grid[SIZE][SIZE])
  110. {
  111.     int neighbour = 0;
  112.  
  113.     for(int row = 1; row < SIZE-1; row++)
  114.     {
  115.             for(int col = 1; col < SIZE-1; col++)   
  116.             {    
  117.                  if(grid[row+1][col+1] == '*') neighbour++;
  118.                  if(grid[row+1][col] == '*') neighbour++;
  119.                  if(grid[row+1][col-1] == '*') neighbour++;
  120.                  if(grid[row][col-1] == '*') neighbour++;
  121.                  if(grid[row][col+1] == '*') neighbour++;
  122.                  if(grid[row-1][col-1] == '*') neighbour++;
  123.                  if(grid[row-1][col] == '*') neighbour++;
  124.                  if(grid[row-1][col+1] == '*') neighbour++;   
  125.             }           
  126.     } 
  127.  
  128.     return neighbour;
  129.  
  130. }
  131.  
  132.  
  133.  
  134.  
  135.  
  136.  
  137. void newGen(char grid[SIZE][SIZE])
  138. {
  139.      int neighbour = countAlive(grid);
  140.      char nuevo[SIZE][SIZE];
  141.  
  142.      grid[SIZE][SIZE] = nuevo[SIZE][SIZE];
  143.  
  144.  
  145.      for(int row = 0; row < SIZE; row++)
  146.      {
  147.              for(int col = 0; col < SIZE; col++)
  148.              {
  149.                  grid[row][col] = nuevo[row][col];
  150.  
  151.                  if(grid[row][col] == '*' && neighbour == 1)
  152.                         nuevo[row][col] == '*';
  153.                  if(grid[row][col] == '.' && neighbour == 1)
  154.                         nuevo[row][col] == '.';
  155.                  if(grid[row][col] == '*' && neighbour == 2)
  156.                         nuevo[row][col] == '*';
  157.                  if(grid[row][col] == '.' && neighbour == 2)
  158.                         nuevo[row][col] == '*';
  159.                  if(grid[row][col] == '*' && neighbour > 2)
  160.                         nuevo[row][col] == '.';
  161.                  if(grid[row][col] == '.' && neighbour > 2)
  162.                         nuevo[row][col] == '.'; 
  163.                  }
  164.      }    
  165. }
Last edited by Narue; Aug 26th, 2008 at 12:15 pm. Reason: Added code tags
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Re: Game Of Life help? Ive done most of it

 
0
  #2
Aug 26th, 2008
What happens when you run it? I'm guessing you are possibly getting a segmentation fault error in line 122 below due to your attempt to access element grid[SIZE][SIZE] . Arrays in C++ start at 0 and go to SIZE - 1. Or are you trying to do a deep copy of the entire array here? If so, that line isn't going to do it.

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  4.  
  5. using namespace std;
  6.  
  7. const int SIZE = 20;
  8. bool readGrid(string fileName, char grid[SIZE][SIZE]);
  9. void displayGrid(const char grid[SIZE][SIZE]);
  10. int countAlive(char grid[SIZE][SIZE]);
  11. void newGen(char grid[SIZE][SIZE]);
  12.  
  13.  
  14.  
  15.  
  16. // declare more functions if necessary
  17.  
  18. int main()
  19. {
  20.     string fileName; // the name of the grid file
  21.     int nGenerations; // nGenerations is the number of generations
  22.     char grid[SIZE][SIZE]; // a char array consiting of '*' or '.'
  23.     // declare more variables if necessary
  24.  
  25.     char nuevo[SIZE][SIZE];
  26.  
  27.     cout << "Enter the filename of the grid: " << flush; // don't modify
  28.     cin >> fileName; // don't modify
  29.     cout << endl; // don't modify
  30.  
  31.     readGrid(fileName, grid);
  32.     displayGrid(grid);
  33.  
  34.     // add processing for reading and displaying the grid
  35.  
  36.     cout << endl << "How many generations in total? " << flush; // don't modify
  37.     cin >> nGenerations; // don't modify
  38.  
  39.  
  40.     // add processing for new grid generations
  41.  
  42.     if (nGenerations == 1) // don't modify
  43.         cout << "This is the grid after " << nGenerations << " generation:" << endl << endl; // don't modify
  44.     else // don't modify
  45.         cout << "This is the grid after " << nGenerations << " generations:" << endl << endl; // don't modify
  46.  
  47.  
  48.  
  49.     // display the grid
  50.  
  51.     cout << endl; // don't modify
  52.     system("pause"); // don't modify
  53.     return 0; // don't modify
  54. }
  55.  
  56. // implement all declared functions
  57.  
  58.  
  59. bool readGrid(string fileName, char grid[SIZE][SIZE])
  60. {
  61.     ifstream inData;
  62.  
  63.     inData.open(fileName.c_str());
  64.  
  65.     if(inData)
  66.     {
  67.         for(int row = 0; row < SIZE; row++)
  68.         {
  69.             for(int col = 0; col < SIZE; col++)
  70.             {
  71.                 inData >> grid[row][col];
  72.             }
  73.         }
  74.         return true;
  75.     }
  76.     else
  77.         return false;
  78. }
  79.  
  80.  
  81. void displayGrid(const char grid[SIZE][SIZE])
  82. {
  83.     for(int row = 0; row < SIZE; row++)
  84.     {
  85.         for(int col = 0; col < SIZE; col++)
  86.         {
  87.             cout << grid[row][col] << " ";
  88.         }
  89.         cout << endl;
  90.     }
  91. }
  92.  
  93.  
  94. int countAlive(char grid[SIZE][SIZE])
  95. {
  96.     int neighbour = 0;
  97.  
  98.     for(int row = 1; row < SIZE-1; row++)
  99.     {
  100.         for(int col = 1; col < SIZE-1; col++)
  101.         {
  102.             if(grid[row+1][col+1] == '*') neighbour++;
  103.             if(grid[row+1][col] == '*') neighbour++;
  104.             if(grid[row+1][col-1] == '*') neighbour++;
  105.             if(grid[row][col-1] == '*') neighbour++;
  106.             if(grid[row][col+1] == '*') neighbour++;
  107.             if(grid[row-1][col-1] == '*') neighbour++;
  108.             if(grid[row-1][col] == '*') neighbour++;
  109.             if(grid[row-1][col+1] == '*') neighbour++;
  110.         }
  111.     }
  112.  
  113.     return neighbour;
  114. }
  115.  
  116.  
  117. void newGen(char grid[SIZE][SIZE])
  118. {
  119.     int neighbour = countAlive(grid);
  120.     char nuevo[SIZE][SIZE];
  121.  
  122.     grid[SIZE][SIZE] = nuevo[SIZE][SIZE];
  123.  
  124.  
  125.     for(int row = 0; row < SIZE; row++)
  126.     {
  127.         for(int col = 0; col < SIZE; col++)
  128.         {
  129.             grid[row][col] = nuevo[row][col];
  130.  
  131.             if(grid[row][col] == '*' && neighbour == 1)
  132.                 nuevo[row][col] == '*';
  133.             if(grid[row][col] == '.' && neighbour == 1)
  134.                 nuevo[row][col] == '.';
  135.             if(grid[row][col] == '*' && neighbour == 2)
  136.                 nuevo[row][col] == '*';
  137.             if(grid[row][col] == '.' && neighbour == 2)
  138.                 nuevo[row][col] == '*';
  139.             if(grid[row][col] == '*' && neighbour > 2)
  140.                 nuevo[row][col] == '.';
  141.             if(grid[row][col] == '.' && neighbour > 2)
  142.                 nuevo[row][col] == '.';
  143.         }
  144.     }
  145. }
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Re: Game Of Life help? Ive done most of it

 
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  #3
Aug 26th, 2008
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Originally Posted by VernonDozier View Post
What happens when you run it? I'm guessing you are possibly getting a segmentation fault error in line 122 below due to your attempt to access element grid[SIZE][SIZE] . Arrays in C++ start at 0 and go to SIZE - 1. Or are you trying to do a deep copy of the entire array here? If so, that line isn't going to do it.
Well in that function im making a new generation, so I tried to copy it to another array inside the function. I guess Ill have to try something else then.

I think my main problem is I dont know how to tell it how many times to make a new generation, like once, twice or up to eight times. And then how to display the new grid. Wah, lol.....
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Re: Game Of Life help? Ive done most of it

 
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  #4
Aug 26th, 2008
Ok well I added a new function to swap the arrays, I think that is better now :s



C++ Syntax (Toggle Plain Text) 
  1. void swapArray(char grid[SIZE][SIZE], char nuevo[SIZE][SIZE])
  2. {
  3.      for(int row = 0; row < SIZE; row++)
  4.      {
  5.              for(int col = 0; col < SIZE; col++)
  6.              {
  7.                      grid[row][col] ==  nuevo[row][col];
  8.              }   
  9.      }     
  10. }     
  11.  
  12.  
  13.  
  14.  
  15.  
  16.  
  17.  
  18. void newGen(char grid[SIZE][SIZE])
  19. {
  20.      int neighbour = countAlive(grid);
  21.      char nuevo[row][col] = swapArray(grid, nuevo);
  22.  
  23.      for(int row = 0; row < SIZE; row++)
  24.      {
  25.              for(int col = 0; col < SIZE; col++)
  26.              {                     
  27.                  if(grid[row][col] == '*' && neighbour == 1)
  28.                         nuevo[row][col] == '*';
  29.                  if(grid[row][col] == '.' && neighbour == 1)
  30.                         nuevo[row][col] == '.';
  31.                  if(grid[row][col] == '*' && neighbour == 2)
  32.                         nuevo[row][col] == '*';
  33.                  if(grid[row][col] == '.' && neighbour == 2)
  34.                         nuevo[row][col] == '*';
  35.                  if(grid[row][col] == '*' && neighbour > 2)
  36.                         nuevo[row][col] == '.';
  37.                  if(grid[row][col] == '.' && neighbour > 2)
  38.                         nuevo[row][col] == '.';    
  39.  
  40.                  }   
  41.  
  42.      }
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Re: Game Of Life help? Ive done most of it

 
0
  #5
Aug 26th, 2008
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Originally Posted by starletcharmed View Post
Ok well I added a new function to swap the arrays, I think that is better now :s



C++ Syntax (Toggle Plain Text) 
  1. void swapArray(char grid[SIZE][SIZE], char nuevo[SIZE][SIZE])
  2. {
  3.      for(int row = 0; row < SIZE; row++)
  4.      {
  5.              for(int col = 0; col < SIZE; col++)
  6.              {
  7.                      grid[row][col] ==  nuevo[row][col];
  8.              }   
  9.      }     
  10. }
Close. Change the == to = . Also, which one is the source array and which one is the destination array? What are you copying into what?





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Originally Posted by starletcharmed View Post
C++ Syntax (Toggle Plain Text) 
  1. void newGen(char grid[SIZE][SIZE])
  2. {
  3.      int neighbour = countAlive(grid);
  4.      char nuevo[row][col] = swapArray(grid, nuevo);
  5.  
  6.      for(int row = 0; row < SIZE; row++)
  7.      {
  8.              for(int col = 0; col < SIZE; col++)
  9.              {                     
  10.                  if(grid[row][col] == '*' && neighbour == 1)
  11.                         nuevo[row][col] == '*';
  12.                  if(grid[row][col] == '.' && neighbour == 1)
  13.                         nuevo[row][col] == '.';
  14.                  if(grid[row][col] == '*' && neighbour == 2)
  15.                         nuevo[row][col] == '*';
  16.                  if(grid[row][col] == '.' && neighbour == 2)
  17.                         nuevo[row][col] == '*';
  18.                  if(grid[row][col] == '*' && neighbour > 2)
  19.                         nuevo[row][col] == '.';
  20.                  if(grid[row][col] == '.' && neighbour > 2)
  21.                         nuevo[row][col] == '.';    
  22.  
  23.                  }   
  24.  
  25.      }
Line 4 above. Be careful. Are you declaring a new array called nuevo? if so, what is the size? Is it supposed to be SIZE x SIZE or row x col? Also, do it in two separate lines:

C++ Syntax (Toggle Plain Text) 
  1. char nuevo[?][?];
  2. swapArray(grid, nuevo);  // make sure this order matches the order
  3.                          // in swapArray and that you are copying
  4.                          // the correct array into the correct array

Edit : To clarify, are you trying to SWAP the arrays or COPY one array into the other?
Last edited by VernonDozier; Aug 26th, 2008 at 9:06 pm.
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