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a guest Oct 21st, 2019 72 Never
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  1. import java.math.*;
  2. public class numberfun {
  3.     public static void main(String[] args){
  4.         System.out.println(pi());
  5.         System.out.println(euler());
  6.     }
  7.     public static double pi(){
  8.         double sum=0;
  9.         for (double i=1, pos=1;pos<=1000;pos++,i+=2){
  10.             sum=pos%2==1?sum+4/i:sum-4/i;
  11.         }
  12.         return sum;
  13.     }
  14.     public static double euler(){
  15.         double sum=0;
  16.         for (double i=0;i<=170;i++){
  17.             sum+=(1.0/factorial(i));
  18.         }
  19.         return sum;
  20.     }
  21.     public static double factorial(double n){
  22.         double prod=1;
  23.         for (int i=2;i<=n;i++){
  24.             prod*=i;
  25.         }
  26.         return prod;
  27.     }
  28. }
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