打印随机数循环

时间:2014-11-27 20:11:14

标签: loops random printing numbers

有人可以解释为什么程序1只重复打印一个随机数吗?而下面的程序2打印100个随机数?另外,是否有编辑程序1来执行程序2的操作?

计划1

public class RandomComparison {

    public static void main(String[] args){

        int rnd = (int) Math.random() * 6 + 1;

        for(int i=0; i<100; i++){
        System.out.print(rnd);
        }

    }


}

计划2

public class RandomPractice {
    public static void main (String[] args){
        int roll;
        String msg = "Here are 100 random rolls of the dice:";
        System.out.println(msg);

        for (int i=0; i<100; i++){
            roll = randomInt(1, 6);
            System.out.print(roll);
        }
    }

    public static int randomInt(int low, int high){
        int result = (int) (Math.random()*(6) + low);
        return result;
    }
}

1 个答案:

答案 0 :(得分:0)

在第一种方法中,您将检索一次随机值并将该单个值打印100次。第二种方法是生成一个随机数100次,并在每次迭代时打印它。

int rnd = (int) Math.random() * 6 + 1;//grabbed only once

for(int i=0; i<100; i++){
    System.out.print(rnd);//printing `rnd` 100 times
}



for (int i=0; i<100; i++){
        roll = randomInt(1, 6);//calling for a new random number with each iteration, then printing it
        System.out.print(roll);
}

并正确使用您的randomInt方法:

public static int randomInt(int low, int high){
    int result = (int) (Math.random()*(high) + low);//replace `6` with the parameter `high`
    return result;
}

要修复第一个方法,让它与第二个方法一样运行:

public class RandomComparison {

   public static void main(String[] args){

       for(int i=0; i<100; i++){
           System.out.print((int)(Math.random()* 6) + 1);//prints out a random number with every iteration
       }
   }
}