C++ double 关键字
定义和用法
The double 关键字是一种数据类型，通常为 64 位长，用于存储小数。
使用 64 位，它可以存储正负数，其值介于 1.7e−308 和 1.7e+308 之间。
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在我们的 C++ 数据类型教程 中了解更多关于数据类型的信息。
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