Question

我目前正在学习Java，我知道Python很好，但是我似乎无法使Java问题与我的python程序一样工作。这是python程序：

import random as rand
successes = 0
for x in range (1000):
    stake = 100
    bets = 0
    while stake >0 and stake <200:
        play = rand.randint(0,1)
        bets +=1
        if play == 0:
            stake = stake -1
        else:
            stake = stake + 1
    if stake == 200:
        successes +=1
    print ('stake = ', stake, 'bets made =', bets)
print (successes/1000)
print(bets/1000)

当我运行它时，我得到的是这样的：

stake =  0 bets made = 19832
stake =  200 bets made = 5240
stake =  200 bets made = 3156
stake =  0 bets made = 10338
stake =  200 bets made = 11198
stake =  0 bets made = 6150
stake =  200 bets made = 10934
stake =  200 bets made = 11368
stake =  0 bets made = 8724
stake =  0 bets made = 17158
stake =  200 bets made = 6158
stake =  200 bets made = 7690
stake =  200 bets made = 2170
stake =  200 bets made = 12268
stake =  0 bets made = 15878
stake =  200 bets made = 16486
stake =  0 bets made = 6396
0.518
6.396

现在这是我为Java程序所做的工作，我被告知要使用Math.random（）和Math.Round（），我认为这可能是我遇到问题的地方，我不知道该放在哪里Math.Round（）

public class Gambler {
    public static void main(String[] args){
       double successes = 0;
       for (int i = 0; i <1000;i++){
           double stake = 100;
           double bets = 0;
           while(stake>0 && stake <200){
               bets++;
               if (Math.random()<0.5) stake ++;
               else stake --;
           if (stake==200) successes++;

           System.out.println("stake = "+ stake + " bets made = " + bets);

           }
       System.out.println("average successes = " + successes/1000);
       System.out.println("average bets = " + bets/1000);
       }
    }
    }

当我运行这个时，我会得到这个

stake = 196.0 bets made = 10290.0
stake = 197.0 bets made = 10291.0
stake = 198.0 bets made = 10292.0
stake = 197.0 bets made = 10293.0
stake = 196.0 bets made = 10294.0
stake = 197.0 bets made = 10295.0
stake = 198.0 bets made = 10296.0
stake = 197.0 bets made = 10297.0
stake = 198.0 bets made = 10298.0
stake = 197.0 bets made = 10299.0
stake = 196.0 bets made = 10300.0
stake = 195.0 bets made = 10301.0
stake = 196.0 bets made = 10302.0
stake = 197.0 bets made = 10303.0
stake = 196.0 bets made = 10304.0
stake = 197.0 bets made = 10305.0
stake = 196.0 bets made = 10306.0
stake = 197.0 bets made = 10307.0
stake = 198.0 bets made = 10308.0
stake = 199.0 bets made = 10309.0
stake = 200.0 bets made = 10310.0
average successes = 0.512
average bets = 10.31

Answer 1

在python中，如果stake == 200:在while循环之外，则在java中它在内部，同样，当您在python之外，java中的输出在for循环中。我相信这更接近您的python代码。

public class Gambler {
    public static void main(String[] args){
       double successes = 0;
       double bets = 0;
       for (int i = 0; i <1000;i++){
           double stake = 100;
           bets = 0; // initialize outside of for loop
           while(stake>0 && stake <200){
               bets++;
               if (Math.random()<0.5) stake ++;
               else stake --;
           }
           if (stake==200) successes++;

           System.out.println("stake = "+ stake + " bets made = " + bets);
       }    
       System.out.println("average successes = " + successes/1000);
       System.out.println("average bets = " + bets/1000);
    }
}

Answer 2

public class Gambler {
    public static void main(String[] args){
        double successes = 0;
        for (int i = 0; i <1000;i++){
            double stake = 100;
            double bets = 0;
            double  play = Math.random();
            while(stake>0 && stake <200){
                bets++;
                if (play == 0) stake --;
                else stake ++;
            }
            if (stake==200) successes++;
            System.out.println("stake = "+ stake + " bets made = " + bets);
        }
        System.out.println("average successes = " + successes/1000);
        System.out.println("average bets = " + bets/1000);
    }
}

Java程序无法像python程序一样工作，我也不知道为什么

2 个答案: