帮助java程序（素数） [英] Help with a java program (prime numbers)

问题描述

我会感谢你给我的任务提供帮助。



素数是一个大于1的整数，只能被1和它本身整除。

完成isPrime（）方法，它采用整数参数。此方法

返回一个布尔值：如果参数为prime，则为true，否则为false。执行

方法中所需的计算;不要只使用预先计算的

素数列表或if-else链！



这就是我所拥有的。

我不知道应该在哪里放置我的印刷语句，这样当输入一个数字时，它会告诉你它是否是素数。

I''d appreciate help on the task I am given.

A prime number is an integer greater than 1 that is only evenly divisible by 1 and itself.
Complete the isPrime() method, which takes an integer argument. This method
returns a boolean value: true if the argument is prime, and false otherwise. Perform
the required calculations in your method; DO NOT simply use a list of pre-calculated
prime numbers or an if-else chain!

This is what I have.
I don''t know where I should place my print statements so that when a number is entered, it tells you whether or not it is prime.

public static boolean isPrime(int n){
System.out.println("Enter a number to determine if it is prime: ");
boolean prime = true;

if (n % 2 == 0){
return false;
}
for (int i = 3; i < n; i++){
if (n % i == 0){
prime = false;
break;
}
return prime
}

推荐答案

你好

YOur

System.out.println("Enter a number to determine if it is prime: ");

不应该在功能内部。



你需要的功能外部（伪代码）

shouldn''t be inside the function.

OUTSIDE of the function you would need to have (pseudoCode)

Ask the user for a number
Get the number from the user
Call the function, passing the number entered
if (the Function Returned True)
    Tell the user it's a prime
Else
    Tell the user it's not a prime

因此函数本身只能计算数字是否为素数。这样，如果你将来找到一个更好的算法（提示看看PiebaldConsult的提示！），你可以重写那个函数而不会弄乱程序的其余部分。



祝你好运！

So the function itself JUST calculates if the number is a prime. That way, if you find a better algorithm in the future (hint see PiebaldConsult''s hint!), you can just rewrite that one function without messing up the rest of the program.

Good luck!

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