在初始化“float”时，转换为“float”并添加“f”作为后缀，有什么区别？ [英] What is the difference between casting to `float` and adding `f` as a suffix when initializing a `float`?

问题描述

What is the difference between

float f = (float) 99.32 ;

和

float f = 99.32f ;

它们都编译成功并运行。

Both of them compiled and ran successfully.

推荐答案

float f = 99.32f ;

这是一个 float 字面值，意思是一个浮点型变量被直接赋值为 float 值。

That is a float literal, which means a float variable being assigned with a float value directly.

float f = (float) 99.32 ;

这是一个被赋值的 float 变量一个 double 值被分配给 float 。

That is a float variable that is assigned a double value that is casted to float before being assigned.

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