c ++基本问题请解决 [英] c++ basic question please resolve

问题描述

0.0和0.00以及0.0f和0.000f之间有什么区别？

解决方案

没有区别。你显然需要依靠文字的语法以及浮点数据类型的工作原理： http://en.wikipedia.org/wiki/Floating_point [ ^ ]。







没有f的文字是依赖于C ++的实现，可以是float的两倍，但是带有f的文字意味着单精度浮点字面量。所有数值都相同，代表零实数。



（感谢下面Ron Beyer的评论。）

-SA

我知道......0.0和0.00表示 double 类型

i知道...0.0f和0.000f表示 float 类型



例如，

< pre lang =c ++> float a = 0 。 0 ; // float< = double
float b = 0 。 00 ; // float< = double
double c = 0 .0f; // double< = float
double d = 0 .00f; // double< = float

what is difference between 0.0 and 0.00 and 0.0f and 0.000f?

解决方案

No difference.You apparently need to lean about the syntax for literal and how floating-point data types work: http://en.wikipedia.org/wiki/Floating_point[^].

[EDIT]

The literal without "f" is implementation dependent in C++, can be double of float, but the ones with "f" mean single-precision floating-point literal. All values are identical and represent zero real number.

(Credit to the comment by Ron Beyer below.)

—SA

i know... "0.0 and 0.00" means double Type
i know... "0.0f and 0.000f" means float Type

for example,

float a = 0.0;   // float <= double
float b = 0.00;   // float <= double
double c = 0.0f;   // double <= float 
double d = 0.00f;   // double <= float 

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