Why do you need to use comments in a C program?

Answer 1

Preferably as little as possible, however it depends on the language. Low-level languages require a vast amount of user-comments because it can be extremely difficult to read the logic from the code alone. High-level languages require very few comments because the code should be largely self-documenting. Languages like C++ allow you to express concepts and ideas directly in code, so there's very little you need to document with a comment. Choosing good names for functions, classes and variables is a vital aspect of creating readable code.

Answer 2

To help the programmer keep track of what is going on. I start every new function I write by describing what I want to do in comments. Then, I fill in the gaps with executable lines of code to do what I described in the comments. Comments are useful in a team so that everyone understands what the function does. Not everyone on the team can read the code directly and know what it means, especially if it is complicated or subtle. Comments are also use to identify who wrote the function, or who made a particular change, so you know who to ask if you still don't know what the code does.

Answer 3

A program is executed by the computer, and thus it DOES NOT include comments in those instructions.

Comments are for human eyes to understand a piece of code (a piece maybe range from 1 expression to the entire software). They should be saved with the code in files. Those files are NOT programs, they are simply text files.

A compiler or an interpreter takes those text files and translated into computer instructions to be carried out. The first thing to be removed from those text files - comments.

Answer 4

Comments are used to provide additional information to the (human) reader. C is a relatively low-level language and code can often be difficult to read, thus programmers use comments to provide more informative documentation within the code itself. In object oriented languages, the need for comments is greatly reduced because (most) notions can be expressed directly in the code itself. But in C, expressing notions in code is more difficult, thus comments help express these notions in natural language.

Answer 5

To explain why a piece of code exists. Even if you are the only developer who will ever see the code, simple reminders make code easier to digest, particularly when reviewing your old code. Good code requires very little commentary since it should be largely self-documenting. It is never necessary to explain what a piece of code does since the code itself tells you exactly what it does, but it won't necessarily tell you why it does it. Thus it helps to explain why a piece of code exists using a short introductory comment. Code that is verbosely commented is actually harder to read because it interrupts the flow of the code, therefore comments within the code itself should be placed off to one side.

Answer 6

Not mandatory.

Answer 7

They are notes to a human reader.

Answer 8

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