初始化“float"时，强制转换为“float"和添加“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

有什么区别

float f = (float) 99.32 ;

和

float f = 99.32f ;

它们都编译并成功运行.

Both of them compiled and ran successfully.

推荐答案

float f = 99.32f ;

那是一个 float 字面量，意思是一个 float 变量直接赋值给一个 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 float 变量，它被分配了一个 double 值，该值在分配之前被转换为 float.

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

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