Program comments are explanatory statements that you can include in the C++ code that you write and helps anyone reading it's source code. All programming languages allow for some form of comments.
C++ supports single-line and multi-line comments. All characters available inside any comment are ignored by C++ compiler.
C++ comments start with /* and end with */. For example:
/* This is a comment */ /* C++ comments can also * span multiple lines */
A comment can also start with //, extending to the end of the line. For example:
#include <iostream> using namespace std; main() { cout << "Hello World"; // prints Hello World return 0; }
When the above code is compiled, it will ignore // prints Hello World and final executable will produce the following result:
Hello World
Within a /* and */ comment, // characters have no special meaning. Within a // comment, /* and */ have no special meaning. Thus, you can "nest" one kind of comment within the other kind. For example:
/* Comment out printing of Hello World:
cout << "Hello World"; // prints Hello World
*/
