Lab2-Pi

JLab>javac Pi.java
JLab>
JLab>java Selftest 

JLab> testPi : ok ok ok ok ok ok ok ok ok ok ok ok ok ok ok ok ok ok ok ok  (10.0/10.0)
JLab> : -----------------------------
JLab> : You got 10.0 points (out of 10.0)
JLab> : -----------------------------
JLab> :<POINT>10.0</POINT> (<TOTAL>10.0</TOTAL> )
JLab>

Pi.java

import java.util.Scanner;

public class Pi {
  // pi1 = 4*(1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11 + ...)
  // pi2 = 4*(2/3 * 4/3 * 4/5 * 6/5 * 6/7 * 8/7 * ...)
  public static void main(String[] args) {
    Scanner kb = new Scanner(System.in);
    System.out.print("k = ");
    int k = kb.nextInt();

    double pi1 = 0, pi2 = 1.0;
 int n = 1;
 while (n <= k) {
   if (n % 2 == 1) {
     pi1 = pi1 + 4 * (1.0 / (2 * n - 1));
     } else {
       pi1 = pi1 - 4 * (1.0 / (2 * n - 1));
       }
       n = n + 1;
       }
       double m = 2, p = 2;
       while (m <= k) {
         pi2 = pi2 * (m * (m + 2.0) / ((2 * p - 1.0) * (2 * p - 1.0)));
         m = m + 2;
         p++;
         } pi2 *= 4;
         
       


    System.out.println("Pi = " + pi1);  // แสดงผลของสูตรแรก
    System.out.println("Pi = " + pi2);  // แสดงผลของสูตรที่สอง
  }

}

SM=1, CM=2, ST=5, KY=239, TR=60:00
ERR = 60:00 ;
ERR = 60:00 ;