Question

我想比较彩票计划的2位数字

，2位是随机的

所以我写了这段代码：

package home6;

import java.util.Scanner;

public class Lottery {

    public static void main(String[] arga) {

        Scanner input = new Scanner(System.in);

        System.out.print("Enter your lottery pick (two digits): ");
        int guess = input.nextInt();

        int guessDigit1 = guess / 10;
        int guessDigit2 = guess % 10;

        int lottery = (int) Math.random();
        System.out.println("The lottery number is " + lottery);

        int lotteryDigit1 = lottery / 10;
        int lotteryDigit2 = lottery % 10;

        if (guess == lottery) {
            System.out.println("Match all digits: you win $10,000");
        } else if (guessDigit2 == lotteryDigit1 && guessDigit1 == lotteryDigit2) {
            System.out.println("Match all digits: you win $3,000");
        } else if (guessDigit1 == lotteryDigit1 || guessDigit1 == lotteryDigit2 || guessDigit2 == lotteryDigit1 || guessDigit2 == lotteryDigit2) {
            System.out.println("Match one digit: you win $1,000");
        } else {
            System.out.println("Sorry, no match");

        }
    }
}

在第17行，// int lottery = (int) Math.random();，问题是什么？

如何随机抽奖？

这是我的问题。

Answer 1

您想要一个0到99之间的数字：

int lottery = (int) (Math.random() * 100);

Answer 2

Math.random()返回0.0~1.0之间的结果。所以你把它投到Integer，总是为0.如果你想要抽奖号码是0~100，那就把它(int) (Math.random()*100)。

Answer 3

通常的方法是：

Random random = new Random();

public void test() {
    int zeroToNinetyNine = random.nextInt(100);
}

Answer 4

import java.util.Scanner;

public class Lottery {

    public static void main(String[] args) {
        
        Scanner input = new Scanner(System.in);
        
        System.out.println("Enter your two lucky Digits:");
        int think = input.nextInt();
        
        int thinkdigit1 = think / 10;
        int thinkdigit2 = think % 10;
        
        int casino= (int) (Math.random() * 100);
        System.out.println("The lottery number is:" +casino);
        
        
        int casinonumber1= casino / 10;
        int casinonumber2 = casino % 10;
        
        
        if (think==casino)
        {
            System.out.println("Perfact match!. you won $10,000");
        }
        else if (thinkdigit1==casinonumber2 && thinkdigit2==casinonumber1)
        {
            System.out.println("Match Both Digit: you won $3000");
        }
        else if (thinkdigit1==casinonumber1||thinkdigit1==casinonumber2||thinkdigit2==casinonumber1||thinkdigit2==casinonumber2)
        {
            System.out.println("Only One Digit matched: you won $1000");
        }
        else { System.out.println("Sorry!! No match! Better Luck Next Time!! you can't try again!");}
    }
}

比较一个彩票程序的两位数字如何随机？

4 个答案: