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changing array value...

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gopi17 gopi17 is offline Offline
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changing array value...

 
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  #1
Sep 5th, 2009
ok...i'm having trouble changing a value in a array into a character
C++ Syntax (Toggle Plain Text) 
  1. void gameon(int **game,int &size,int &x,int &y,int &score1,int &score2)
  2. {
  3.    int i,j,num1,num2;
  4.    cout<<"Please enter a number from the selected row/column -->";
  5.    cin>>num1;
  6.      for(j=0;j<size;j++)
  7.      {
  8.         if(num1==game[x][j])
  9.         {
  10.           cout<<"Number found"<<endl;
  11.           game[x][j]=='X';
  12.           score1=score1+num1;
  13.           y=j;
  14.         }
  15.      }
  16.      display(game,size,score1,score2);
  17. }

i can't seem to change that specific number into 'X'..
can u guys help me out...
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vmanes vmanes is offline Offline
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Re: changing array value...

 
0
  #2
Sep 5th, 2009
Two problems in one statement.
C++ Syntax (Toggle Plain Text) 
  1. game[x][j]=='X';

First, you're using the equality test ( == ) instead of assignment ( = ).
Second, you're trying to assign a character to an integer variable. This will work (when you fix problem 1) but will not give you the result I think you're expecting. What will be assigned to the array element is the ASCII value of 'X' (which is 88, if I read my ASCII chart right.)

If you want to mark the spot as used or free or whatever, you'll need to pick a value out of the range of allowable values. For instance, if the valid data can be any positive number greater than 0 (zero), use 0. If 0 could be a valid data item, how about some negative number? If all possible numbers are potentially valid, then you need some other way to indicate the cell is empty/available or whatever. Perhaps a parallel array where you simply mark 0 or 1 to indicate that the corresponding cell in the data array is available or not.
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