Java 长数字帮助

发布于 2024-11-01 20:07:53 字数 190 浏览 4 评论 0原文

所以在我的代码顶部我声明了变量 私人长计数器； 当我尝试给它一个非常长的数字时，它会给出一个错误，我正在尝试这样做 计数器 = 1111111111111111; 那是 16 个“1”，我不断收到错误“int 类型的文字 1111111111111111 超出范围”我做错了什么？

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帅哥哥的热头脑 2024-11-08 20:07:53

尝试如下：

counter = 1111111111111111l;

请注意，最后一个字符是字母“L”（当然是小写），而不是数字一。这是一个更清晰的示例：

counter = 2222222222222222L;

正如其他人指出的那样，大写“L”也可以使用，并且更加清晰。 Java 中的所有整数文字都被解释为 int，除非您在它们后面添加“L”（或“l”）后缀以告诉编译器将其解释为 long。

文字浮点数也会发生类似的情况，默认情况下它们被解释为 double ，除非您在它们后面加上“f”后缀以告诉编译器将其解释为 float >。如：

double num1 = 1.0;  //1.0 is treated as a literal double
float num2 = 1.0;   //1.0 is still treated as a literal double; the compiler may complain about loss of precision
float num3 = 1.0f;  //1.0 is treated as a float, and the compiler is happy

Try it like this:

counter = 1111111111111111l;

Note that the last character there is the letter 'L' (lowercase, of course), and not the number one. Here is a clearer example:

counter = 2222222222222222L;

As others have pointed out, an uppercase 'L' also works and is much more clear. All integer literals in Java are interpreted as ints unless you suffix them with an 'L' (or 'l') to tell the compiler to interpret it as a long.

A similar thing happens with literal floating-point numbers, which are interpreted as doubles by default unless you suffix them with an 'f' to tell the compiler to interpret it as a float. As in:

double num1 = 1.0;  //1.0 is treated as a literal double
float num2 = 1.0;   //1.0 is still treated as a literal double; the compiler may complain about loss of precision
float num3 = 1.0f;  //1.0 is treated as a float, and the compiler is happy

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未蓝澄海的烟 2024-11-08 20:07:53

java编译器默认将任何数字读取为整数。 11111111111 显然超出了整数范围。输入 counter=11111111111L; 让编译器正确读取值。

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卷耳 2024-11-08 20:07:53

问题是默认情况下数字文字是 int 。要使数字文字变长，您必须使用字母字符 l （小写 L）来结束它。所以：

long counter = 1111111111111111l;

在 C# 中你也可以使用大写的 L。我不确定 Java 是否如此。

The problem is that numeric literals are ints by default. To make the numeric literal a long you have to finish it with the alpha character l (lower-case L). So: