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C++ Comments

Comments in a program are explanatory statements that you can include in your C++ code to enhance the readability of the source code. All programming languages allow some form of comments.

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

C++ comments typically come in two forms:

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

Example

#include <iostream>
using namespace std;

int main() {
  // This is a comment
  cout << "Hello World!";
  return 0;
}

They can also be placed after a statement:

Example

#include <iostream>
using namespace std;

int main() {
   cout << "Hello World!"; // Outputs Hello World!

   return 0;
}

When the above code is compiled, the compiler ignores // This is a comment and // Outputs Hello World!, and the final output will be:

Hello World!

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

#include <iostream>
using namespace std;

int main() {
    /* This is a comment */

    /* C++ comments can also
     * span multiple lines
     */ 
    cout << "Hello World!";
    return 0;
}

Inside /* and */ comments, the // characters have no special meaning. Inside // comments, the /* and */ characters also have no special meaning. Therefore, you can nest one type of comment within another, like so:

/* Comment for outputting Hello World

cout << "Hello World"; // Outputs Hello World

*/
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