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Comments in C++ with Example

Last updated Apr 25, 2024

Comments in C++ are essential for documenting your code, making it more understandable for both yourself and others who might read or work with your code.

C++ supports two types of comments:

Single-Line Comments:

Single-line comments are used to annotate a single line of code. They start with // and continue until the end of the line. Single-line comments are commonly used for short explanations of code or to disable a line temporarily. For example:

// This is a single-line comment
int x = 43; // This comment explains the variable assignment

Anything which is after // on the same line will be ignored by the c++ compiler.

Multi-Line Comments:

In C++, multi-line comments are enclosed within /* and */ delimiters and can span multiple lines. They are commonly used for longer explanations or for commenting out entire sections of code. For example:

/* This is a multi-line comment.
   It can span across multiple lines
   and is often used for more detailed explanations. */
int x = 10; /* You can also use multi-line comments on a single line */

Anything which is between /* */ will be ignored by the C++ compiler.

Here's an example that demonstrates how comments can be used to describe code:

#include <iostream>

int main() {
    // This is a single-line comment
    int age = 32; // The age of the user

    /* This is a multi-line comment.
       It explains that we are going to print a message. */
    std::cout << "Hello, World!" << std::endl;

    return 0;
}