长时间不支持Java for循环类型 [英] Java for loop type long not supported

问题描述

我试图做一个涉及泛数数字的Euler项目问题​​，该数字具有前5个质数的特殊除数要求，并认为这将是起点(请参阅1023456789是第一个要查看的数字，以及9876543210是最后一个).

I was trying to do some Project Euler question which involves pandigital numbers with special divisibility requirements of the first 5 prime numbers, and thought that this would be the starting point (see, 1023456789 is the first number being looked at, and 9876543210 is the last one).

    import java.util.*;
    public class pandigital_special 
    {
        public static void main (String args[])
        {
            for (long l = 1023456789; l <= 9876543210; l++)
            {

            }
        }
    }

谁能告诉我为什么编译器声称for循环仅支持整数?我从未听说过.也就是说，编译器会说"int类型的字面值9876543210超出范围".

Can anyone tell me why the compiler claims that for loops only support integers? I have never heard of that. That is to say, the compiler says "The literal 9876543210 of type int is out of range".

推荐答案

您的代码可以正常工作.唯一的问题是您的第二个数字(9876543210)不在int范围内，但是您使用的是int文字.

Your code works fine. The only problem is that your second number (9876543210) is out of the int range, but you are using an int literal.

要使用长文字，只需在数字的末尾附加一个L:

To use a long literal, simply append an L to the end of the number:

9876543210L

这是一个更完整的示例:

Here is a more complete example:

public class Test {
    public static void main(String[] args){
        for (long l = 1023456789L; l <= 9876543210L; l++){
            System.out.println(l);
        }
    }
}

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