java - trying to make a diamond but cant understand how to finish it? -

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hey guy iv been trying same exercises on own lately, , thought making diamond out of astricks cool , got stuck on last part. im getting , cant figure out how flip triangle, or make complete diamond 

   *   ***  *****  public static string drawdiamond(int n) {     string results = "";     int cols = 1;     int spaces = n / 2;     while (cols <= n) {         results += drawchars(" ", spaces) + drawchars("*", cols) + "\n";         /*-------------------------------------------------------------------------------- while(cols>=n){  results += drawchars(" ", spaces) + drawchars("*", cols)+"\n";<--- test code.   cols-=2; spaces++; }          */--------------------------------------------------------------------------------          cols += 2;         spaces--;     }      return results; }

just extending logic , assuming n=5, after 3rd iteration cols value become 7 , hence coming out of loop. when cols reached n value, should reverse process increment spaces , decrement cols.

make sure use other variable loop condition, otherwise go infinite loop


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