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C# 常量


常量

如果您不希望其他人(或您自己)覆盖现有值,可以在变量类型前面添加 const 关键字。

这会将变量声明为“常量”,这意味着它是不可更改的且只读的。

示例

const int myNum = 15;
myNum = 20; // error

自己试试 »

当您希望变量始终存储相同的值时,const 关键字很有用,这样其他人(或您自己)就不会弄乱您的代码。通常被称为常量的示例是 PI(3.14159...)。

注意:您不能在不赋值的情况下声明常量变量。如果您这样做,将发生错误:常量字段需要提供值


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