Comment lines in c

What are comment lines in c programming?

Comment lines in c programming provides piece of information about some statements of code.

Usually they are the descriptions or explanation for a specific piece of code.

Comments are not executables, they are ignored by compiler.

Comments can be used anywhere in program.

It is optional to use comment lines but it is a good practice to use it.

In c programming language there are two types of comments. They are

• Single line comment
• Multiline comment

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Single line comments

Single line comments starts with double slashes //.

Syntax

// Comment line

Example

#include<stdio.h>
int main()
{
  int var1;                   // This is integer variable declaration
  printf("\n\n\tThis is a program to demonstrate single line comments in c programming\n\n");
  return 0;
}

In the above program, we have commented that var1 is an integer variable. By doing this programmer can understand the usage of that line.

This is a program to demonstrate single line comments in c programming

Try it yourself.

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Multiline comments

Multiline comments are placed between /*…….*/. It is used to make many lines of comments.

Syntax

/*
 multi line comments
*/

Example

#include<stdio.h>
int main()
{
 int var1=10;
 printf("This is integer variable %d \n",var1);
 /*
  This is
  simply a line 
  to print 
  on console */
 return 0;
}

When one has to comment in multiple lines then this multiline comments are helpful.

	This is a program to demonstrate multiline comment
	This is integer variable 10 

Try it yourself.

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