Commenting Style in C++

Exploring CPP

While writing the code, one should always take care that the whole program should be explanatory. In this comments plays an important role.
This makes our code more readable, easier to understand, and also very useful while debugging the code for an error.
C++ provides us two types of commenting styles:

Single Line Comments
Multiple Lines Comments

Let see both of them in details.

Single Line Comments:

Single line comment is represented by double forward slash "//". This is used to comment a single line only. Let's check this with a piece of code:

              // Demo Program for comments
              #include <iostream>
              using namespace std;
              int main() {
                // cout << "Hello Geeks!";
                cout << "A demo program to test single line comments";
                return 0;
              }

In the above code we have commented two individual lines, the first one and the one which is printing the message "Hello Geeks". So when the
above code is compiled, compiler will ignore the lines having "//"and prints only single message.
The final result on execution will be as:

              A demo program to test single line comments

Multiple Line Comments:

Representation of multiple line comment start with forward slash and asterisk "/*" and end with asterisk and forward slash "*/". It can apply
comments in more than a single line. Its syntax is as:

              /* Start of Commented lines
              Line 1...
              Line 2...
              Line 3...
              ...
              ...
              End of the comments */

Let's also check this with an example code.

              // Demo Program for comments
              #include <iostream>
              using namespace std;
              int main() {
                /* cout << "Message 1";
                cout << "Message 2";
                cout << "Message 3";
                cout << "Message 4";
                cout << "Message 5"; */
                cout << "Message 6";
                return 0;
              }

In the above code we have commented the lines which are printing Message 1 to 5. So while compilation, compiler will ignore these commented
lines and the final output after execution will be

              Message 6

In this way, we can comment any part of our code and also put some small notes inside comments in the code to make the code more readable
and easily understandable.