如何生成随机整数?

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英文:

How do I make a random int?

问题

这里是您的翻译代码部分:

  1. for (i = 1; i <= 100; i++) {
  2. int r = (int) (Math.random() * 100) + 1;
  3. System.out.print(r + ", ");
  4. }

请注意,我只进行了代码的翻译,不包括额外的解释或回答。如果您有任何其他问题或需要进一步的帮助,请随时提问。

英文:

So I am trying to make 100 random integers from 1-100 print out. I can make doubles of this but not integers. Please show me how to make this into integers, here is the code.

  1. for(i = 1; i &lt;= 100; i++) {
  2. double r = Math.random();
  3. double in = r * 100;
  4. System.out.print(in + &quot;, &quot;);
  5. }

Please show me what I messed up or if I need to use an alternate technique for this

答案1

得分: 1

你可以使用 Java.util 包中的 Random 对象替代。

  1. Random random = new Random();
  2. int value = random.nextInt(100);
英文:

You can use Random object instead. from java.util package

  1. Random random = new Random();
  2. int value = random.nextInt(100);

答案2

得分: -1

使用ThreadLocalRandom:

  1. for (int i = 1; i <= 100; i++) {
  2. System.out.print(ThreadLocalRandom.current().nextInt(100) + ", ");
  3. }
英文:

Use ThreadLocalRandom:

  1. for (int i = 1; i &lt;= 100; i++) {
  2. System.out.print(ThreadLocalRandom.current().nextInt(100) + &quot;, &quot;);
  3. }

答案3

得分: -1

导入类 java.util.Random
创建类 Random 的实例,即 Random rand = new Random()
调用 rand 对象的以下方法之一:
nextInt(upperbound) 生成范围在 0 到 upperbound-1 之间的随机数。
nextFloat() 生成介于 0.0 和 1.0 之间的浮点数。
nextDouble() 生成介于 0.0 和 1.0 之间的双精度浮点数

例如,如果您想生成一个介于 1 到 100 之间的随机数,则代码将如下所示。

  1. import java.util.Random;
  2. Random r = new Random();
  3. int number = r.nextInt(100);

因此,变量 number 将是一个介于 1 到 100 之间的随机数。

英文:

Import the class java.util.Random
Make the instance of the class Random, i.e., Random rand = new Random()
Invoke one of the following methods of rand object:
nextInt(upperbound) generates random numbers in the range 0 to upperbound-1.
nextFloat() generates a float between 0.0 and 1.0.
nextDouble() generates a double between 0.0 and 1.0

For example if you want to generate a random number between 1 to 100 the the code will be.

  1. import java.util.Random;
  2. Random r = new Random();
  3. Int number = r.nextInt(100);

So variable number will be a random number between 1 to 100

答案4

得分: -2

以下是翻译好的内容:

错误的是语句 double in = r * 100;
必须是

  1. int b = (int) (Math.random()*100)%100; //范围 [0-99]

如果您严格希望 b 在范围 [1-100],只需将 b 增加 1。

英文:

Whats wrong is the statement double in = r * 100;
It must be

  1. int b = (int) (Math.random()*100)%100; //range [0-99]

Just add 1 to b if you strictly want b in the range [1-100]

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  • 本文由 发表于 2020年10月3日 23:32:05
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