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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) throws java.lang.Exception
  11. 	{
  12. 		System.out.println("Rec:   " + RecursiveFunction(1000));
  13. 		System.out.println("Flat0: " + NonRecursiveFunction0(1000));
  14. 		System.out.println("Flat1: " + NonRecursiveFunction1(1000));
  15. 	}
  16.  
  17. 	static float RecursiveFunction(int num){
  18. 	    //The num parameter represents the denominator that will be used
  19. 	    //The recursive function is continually called at lower increments of num
  20.  
  21. 	    //If num is one, return 1 and do not call RecursiveFunction again
  22. 	    if (num == 1) {
  23. 	        return 1;
  24. 	    }
  25. 	    //Otherwise, return 1/num (in floating point decimal) and call RecursiveFunction with a parameter of num - 1
  26. 	    else {
  27. 	        return 1/(float)num + RecursiveFunction(num - 1);
  28. 	    }
  29. 	}
  30.  
  31. 	//A Non-recursive version of RecursiveFunction that will be used to test RecursiveFunction
  32. 	static float NonRecursiveFunction0(int num) {
  33. 	    //The total variable adds up the fractions
  34. 	    float total = 0;
  35. 	    //While num is greater than zero, add 1/num to total and then subtract 1 from num
  36. 	    while (num > 0) {
  37. 	        total += 1/(float)num;
  38. 	        num -= 1;
  39. 	    }
  40. 	    return total;
  41. 	}
  42.  
  43. 	//A Non-recursive version of RecursiveFunction that will be used to test RecursiveFunction
  44. 	static float NonRecursiveFunction1(int num) {
  45. 	    //The total variable adds up the fractions
  46. 	    float total = 0;
  47. 	    //While num is greater than zero, add 1/num to total and then subtract 1 from num
  48. 	    for (int i = 1; i <= num; ++i)
  49. 	    {
  50. 	    	total += 1.0f / i;
  51. 	    }
  52. 	    return total;
  53. 	}
  54. }
Success #stdin #stdout 0.07s 380224KB
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stdin
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Standard input is empty
stdout
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Rec:   7.4854784
Flat0: 7.4854717
Flat1: 7.4854784
https://ideone.com/4Eqduh
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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