bitmap

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Join Date: Apr 2008
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shotjase shotjase is offline Offline
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bitmap

 
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  #1
May 6th, 2008
i have here this constructor used 2 display a bitmap
C++ Syntax (Toggle Plain Text) 
  1. void bitmap::display() const
  2. {
  3.      for (int r = 0; r < numrows; r++)
  4.      {
  5.          for (int c = 0; c < numcols; c++)
  6.          {
  7.              if (grid[r][c] == 0)
  8.              cout << " " ;
  9.  
  10.              else cout << "*";
  11.          }
  12.          cout << endl;
  13.  
  14.  
  15.      }
  16.  
  17. }
i have here this invert function which is meant to make the 0's into 1's and the * into " " but it is not working proply can ne1 help me

C++ Syntax (Toggle Plain Text) 
  1. void bitmap::invert()
  2. {
  3.      for (int r = 0; r < numrows; r++)
  4.      {
  5.          for (int c = 0; c < numcols; c++)
  6.          {
  7.              if (grid[r][c] = 1)
  8.              {
  9.              grid[r][c] = 0;
  10.              cout << "*";
  11.              }
  12.              else{
  13.              grid[r][c] = 1;
  14.             cout << " ";
  15.              }
  16.          }
  17.      }
  18. }
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Join Date: May 2008
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Prabakar Prabakar is offline Offline
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Re: bitmap

 
0
  #2
May 6th, 2008
Its a simple mistake.
if (grid[r][c] = 1)

= is an assinment operator. == is the relational operator

The code is just fine
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Re: bitmap

 
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  #3
May 6th, 2008
i did that but the invert still doesnt work it displays, but the *'s and ' 's are all really far apart
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Prabakar Prabakar is offline Offline
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Re: bitmap

 
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  #4
May 6th, 2008
I dont have much code to deal with, besides the constructor displays a '*' if mat element is 1 & the invert function does the same, even though it changes the matrix. Upload more code
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Re: bitmap

 
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  #5
May 6th, 2008
Why does invert() also display the result?
Shouldn't you just call display() when you're done?

Each function does ONE job properly.
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