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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 Main
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		int a=2499;
  13. 		int b= 100;
  14. 		//System.out.println("Testing method triangleBelow with goal "+a+" and last "+b+"");
  15. 		int resInt=triangleBelow(a,b);
  16. 		//System.out.println("The result of triangleBelow is "+resInt+"");
  17. 		//System.out.println("Testing method sumReciprocals with n equals "+b+"");
  18. 		double resDbl= sumReciprocals(b);
  19. 		//System.out.println("The result of sumReciprocals is "+resDbl+"");
  20. 		int n= (int)(Math.random()*250+50);
  21. 		double myEstimate= estimatePi(n);
  22. 		System.out.println("After using up to "+n+" terms,  the estimated value of pi is "+myEstimate+"");
  23. 	}
  24. 	public static int triangleBelow(int goal, int last)//Needs Tested, Worked
  25. 	{
  26. 		int sum = 0;
  27.     	for(int j=0;j<last; j++)
  28.     	{
  29.     		sum+=j;
  30.     		if(sum>=goal)
  31.     		{
  32.     			break;
  33.     		}
  34.     	}
  35. 	return sum;
  36. 	}
  37. 	public static double sumReciprocals(int n)//Needs tested, Worked
  38. 	{
  39.     	double sum= 0;
  40.     	for(int j=1; j<n+1; j++)
  41.     	{
  42.     		sum+=1.0/j;
  43.     	}
  44. 	return sum;
  45. 	}
  46. 	public static double estimatePi(int n) //Bonus
  47.   {
  48.     	double sign= 1.0;
  49.     	double sum=0;
  50.     	for(int j=0;j<n; j++)
  51.     	{
  52.     		sum+= sign/(2*j+1);
  53.     		sign*=-1;
  54.     		if(sum*4>=3.14 && sum*4<=3.15)
  55.     			break;
  56. 		}
  57. 	return sum*4;	
  58.   }
  59. }
Success #stdin #stdout 0.11s 36576KB
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After using up to 154 terms,  the estimated value of pi is 3.14999586659347
https://ideone.com/l9RnkN
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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