C++ comments

Comments for a program are explanatory statements that you can include in your C++ code, which will improve the readability of the source code. All programming languages ​​allow some form of comments.

C++ supports single-line comments and multi-line comments. All characters in comments are ignored by the C++ compiler.

C++ comments start with /* and end with */. For example:

/* 这是注释 */

/* C++ 注释也可以
 * 跨行
 */

Comments can also start with // and continue until the end of the line. For example:

#include <iostream>
using namespace std;

main()
{
   cout << "Hello World"; // 输出 Hello World

   return 0;
}

When the above code is compiled, the compiler will ignore the // output Hello World, and finally produce the following result:

Hello World

in /* and */ Inside the comment, the // characters have no special meaning. Within // comments, the /* and */ characters also have no special meaning. Therefore, you can nest one type of annotation within another. For example:

/* 用于输出 Hello World 的注释

cout << "Hello World"; // 输出 Hello World

*/