C ++差值在0和0.0之间 [英] C++ difference between 0 and 0.0

问题描述

C ++中0和0.0之间有区别吗？

Is there a difference between 0 and 0.0 in C++? Which should you use for initializing a double?

感谢

推荐答案

文字 0 被视为 int 文字;文字 0.0 是一个 double 文字。当分配给 double 时，这两个都会起作用（因为 int 可以转换为扩展转换）;但是，将 0.0 转换为 int 是一种缩小的转换，必须明确完成;即（int）0.0 。

A literal 0 is considered to be an int literal; literal 0.0 is a double literal. When assigning to a double, either will work (since the int can be cast in a widening conversion); however, casting 0.0 to an int is a narrowing conversion, and must be done explicitly; i.e. (int)0.0.

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