＃include<>和＃define“” [英] what is the difference between #include<> and #define""

问题描述

有人可以告诉我＃include<>和＃define之间的区别。我知道#include<>用于包含头文件，#define用于定义宏或常量..它们喜欢它们不相似

  #includeabc.h
 #defineabc.h
 int main（）
 {
 cout<<Hello; 
 return 1; 
 
} 
  

解决方案

#include 因为你说在实际编译之前用来包括一个文件。

#define 用于定义一个宏..如果你写 #define，它将被编译之前的值替换



<最大10
然后就在编译之前所有的max将被替换为10 ...

此外，您应参考此预处理器上的维基百科文章。 / p>

Can someone tell me the difference between #include<> and #define..I know #include<> is used to include header file and #define is used to define macros or constants ..Is it like they are not similar at all?

#include"abc.h"
#define "abc.h"
int main()
{
cout<<"Hello";
return 1;

}

解决方案

#include as you said is used to include a file before the actual compilation.

#define is used to define a Macro.. that is replaced by its value just before compilation

if you write #define max 10 then just before compilation all the occurrence of "max" will be replace by the number 10...

Furthermore, you should refer to this Wikipedia article on the C preprocessor.

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