为什么有人会使用#define 来定义常量?
这是一个简单的问题,但为什么有人会使用#define 来定义常量?
It's simple question but why would someone use #define to define constants?
有什么区别
#define sum 1
和 const int sum = 1;
推荐答案
#define
有许多不同的应用程序,但您的问题似乎是关于一个特定的应用程序:定义命名常量.
#define
has many different applications, but your question seems to be about one specific application: defining named constants.
在 C++ 中,很少有理由使用 #define
来定义命名常量.
In C++ there's rarely a reason to use #define
to define named constants.
#define
通常在 C 代码中广泛使用,因为 C 语言在定义常量时与 C++ 有很大不同.简而言之,const int
对象在 C 中不是 constants,这意味着在 C 中定义真正常量的主要方法是使用 #define
.(另外,对于 int
常量,可以使用枚举).
#define
is normally widely used in C code, since C language is significantly different from C++ when it comes to defining constants. In short, const int
objects are not constants in C, which means that in C the primary way to define a true constant is to use #define
. (Also, for int
constants one can use enums).
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