Comments

Comments in programming are parts of code that are ignored. It’s a good rule to use them to improve the readability of your code with specific descriptions of what a certain part of the code does. Comments also help when you want to test a certain part of the program without deleting the other code.

To mark the line(or part of the line) as a comment, begin the respective string with //.

For example, in this case, the line which outputs the message "Hello!" will be ignored:


              123456789
            
#include &lt;iostream&gt;
using namespace std;
 
int main() {
 &nbsp&nbsp&nbsp&nbsp // cout << "Hello! \n";
 &nbsp&nbsp&nbsp&nbsp cout << "I love C++! ";
 &nbsp&nbsp&nbsp&nbsp cout << "Goodbye!";
&nbsp&nbsp&nbsp&nbspreturn 0;
}

This type of comment is also good for code explanation:

cout << "Goodbye!";  // Print the message

If you want the compiler to ignore several lines use multi-line comments. They start with /* and end with */:


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#include &lt;iostream&gt;
using namespace std;
 
int main() {
 &nbsp&nbsp&nbsp&nbsp&nbsp/* cout << "Hello!";
 &nbsp&nbsp&nbsp&nbsp cout << "I love C++! "; */ 
 &nbsp&nbsp&nbsp&nbsp cout << "Goodbye!";  // Print the message
 &nbsp&nbsp&nbsp&nbsp return 0;
}

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Kurssisisältö

Introduction to C++

1. Basics

Get Started Output New Lines Comments

2. Variables

Types of Variables Identifiers User Input Strings Simple Math Not Simple Math Increment (Prefix and Postfix)Constant Challenge

3. Conditional Statements

Booleans If Expression More Logical Operators Else Expression Else If Expression Short Forms Challenge Switch Statement The Keyword Default

4. Loops

While Loop Do/While Loop For Loop Break/Continue Statements

5. Intro to Arrays

Basic Concept of the Array Loops in Arrays Manipulations with Arrays Challenge