C++ Comments

Comments are notes in the code. The compiler ignores them. They explain the code to humans.

Single line comment

#include <iostream>

int main() {
    // This line is a comment
    std::cout << "Hello\n";   // comment after code
}

Multi line comment

#include <iostream>

int main() {
    /* A comment on
       more than one line */
    std::cout << "Done\n";
}

Multi line comments can not be nested. A /* inside a comment does not start a new one, and the first */ ends the comment.

Disable code

#include <iostream>

int main() {
    std::cout << "One\n";
    // std::cout << "Two\n";
    std::cout << "Three\n";
}

Good comments

• Explain why, not what. The code says what.
• Keep them short and true: update them when the code changes.
• Use clear names, so you need fewer comments.
• Many teams use documentation comments (/** ... */ with Doxygen) before functions and classes.

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