Code Golf - PI day

Posted by gnibbler on Stack Overflow See other posts from Stack Overflow or by gnibbler
Published on 2010-03-13T22:38:07Z Indexed on 2010/03/13 22:45 UTC
Read the original article Hit count: 654

Filed under:

code-golf

|

rosetta-stone

|

language-agnostic

The Challenge

The shortest code by character count to display a representation of a circle of radius R using the *character. Followed by an approximation of pi

Input is a single number, R

Since most computers seem to have almost 2:1 ratio you should only output lines where y is odd.

The approximation of pi is given by dividing the twice the number of * characters by R squared. The approximation should be correct to at least 6 significant digits. Leading or trailing zeros are permitted, so for example any of 3,3.000000,003 is accepted for the inputs of 2 and 4

Code count includes input/output (i.e full program).

Test Cases

Input
    2
Output
     *** 
     *** 
    3.0

Input
    4
Output
      *****  
     ******* 
     ******* 
      *****  
    3.0

Input
    8
Output
         *******     
      *************  
     *************** 
     *************** 
     *************** 
     *************** 
      *************  
         *******     
    3.125

Input
    10
Output
          *********      
       ***************   
      *****************  
     ******************* 
     ******************* 
     ******************* 
     ******************* 
      *****************  
       ***************   
          *********      
    3.16

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