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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.   public static void main(String[] args) {
  11.     char screen[][]=new char[20][20];
  12.     for(int y=0;y<screen.length;y++)
  13.       for(int x=0;x<screen[y].length;x++)
  14.         screen[y][x]=' ';
  15.     kreis(screen,10,10,7,'*');
  16.     for(char line[]: screen){
  17.       for(char c: line)
  18.         System.out.print(c);
  19.       System.out.println();
  20.     }
  21.   }
  22.  
  23.   public static char[][] kreis(char[][] zf, int xM, int yM, int r, char z){
  24.     for(int i=-r;i<=r;i++){
  25.       int j=(int)Math.round(Math.sqrt(r*r-i*i));
  26.       int x=xM+i;
  27.       int y=yM+j;
  28.       if(x>0 && y>0 && y<zf.length && x<zf[0].length)
  29.         zf[y][x]=z;
  30.       y=yM-j;
  31.       if(x>0 && y>0 && y<zf.length && x<zf[0].length)
  32.         zf[y][x]=z;
  33.       x=xM+j;
  34.       y=yM+i;
  35.       if(x>0 && y>0 && y<zf.length && x<zf[0].length)
  36.         zf[y][x]=z;
  37.       x=xM-j;
  38.       if(x>0 && y>0 && y<zf.length && x<zf[0].length)
  39.         zf[y][x]=z;
  40.     }
  41.     return zf;
  42.   }
  43. }
Success #stdin #stdout 0.06s 2184192KB
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Standard input is empty
stdout
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        *****       
      **     **     
     *         *    
    *           *   
    *           *   
   *             *  
   *             *  
   *             *  
   *             *  
   *             *  
    *           *   
    *           *   
     *         *    
      **     **     
        *****
https://ideone.com/h7UBog
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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