Calculate Circle Perimeter using Java

  1. /*

  2. Calculate Circle Perimeter using Java Example

  3. This Calculate Circle Perimeter using Java Example shows how to calculate

  4. Perimeter of circle using it's radius.

  5. */

  6.  

  7. import java.io.BufferedReader;

  8. import java.io.IOException;

  9. import java.io.InputStreamReader;

  10.  

  11. public class CalculateCirclePerimeterExample {

  12.  

  13. public static void main(String[] args) {

  14.  

  15. int radius = 0;

  16. System.out.println("Please enter radius of a circle");

  17.  

  18. try

  19. {

  20. //get the radius from console

  21. BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

  22. radius = Integer.parseInt(br.readLine());

  23. }

  24. //if invalid value was entered

  25. catch(NumberFormatException ne)

  26. {

  27. System.out.println("Invalid radius value" + ne);

  28. System.exit(0);

  29. }

  30. catch(IOException ioe)

  31. {

  32. System.out.println("IO Error :" + ioe);

  33. System.exit(0);

  34. }

  35.  

  36. /*

  37. * Perimeter of a circle is

  38. * 2 * pi * r

  39. * where r is a radius of a circle.

  40. */

  41.  

  42. //NOTE : use Math.PI constant to get value of pi

  43. double perimeter = 2 * Math.PI * radius;

  44.  

  45. System.out.println("Perimeter of a circle is " + perimeter);

  46. }

  47. }

  48.  

  49. /*

  50. Output of Calculate Circle Perimeter using Java Example would be

  51. Please enter radius of a circle

  52. 19

  53. Perimeter of a circle is 119.38052083641213

  54. */

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