主题：【讨论】【跟进】趣味数学题 (三) -- 数值分析

是Java写的，写得急了点，将就看吧：

package com.mycompany.app;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
 * Hello CCHere!
 *
 */
class Stat
{
 public boolean k1; 
 public boolean k2; 
 };
public class App 
{
 //true is a boy, false is a girl
 //true if k1 is selected, false if k2 is selected for the first meeting
 public static boolean getRandomTrueOrFalse() { 
 Random random = new Random();
 return random.nextBoolean();
 
 }
 public static void main( String[] args )
 {
 boolean k1;
 boolean k2;
 float anotherKidIsBoyCount;
 
 List<Stat> ls = new ArrayList<Stat>();
 
 for (int i=0; i<10000; i++) {
 k1 = getRandomTrueOrFalse();
 k2 = getRandomTrueOrFalse();
 if (k1 || k2 ) { //if one of the kid is a boy, add they to the statistic list. The two girl scenario can be removed
 Stat st = new Stat();
 st.k1 = k1;
 st.k2 = k2;
 ls.add(st);
 }
 }
 anotherKidIsBoyCount=0;
 for (Stat st : ls) {
 if (st.k1) { //if first kid is selected and first kid is a boy
 if (st.k2) {// if second kid is a boy, increase the counter
 anotherKidIsBoyCount++;
 } 
 }
 else {
 if (st.k2) { // if 2nd kid is selected , and second it is a boy
 if (st.k1) { //if first kid is a boy, increase the counter
 anotherKidIsBoyCount++;
 }
 }
 }
 }
 System.out.println("cchere math question answer: " + String.valueOf( anotherKidIsBoyCount/ls.size())); 
 }
}

输出是：

cchere math question answer: 0.33188406