How do you comment in code?

The single line comment is //. Everything from the // to the end of the line is a comment. To mark an entire region as a comment, use /* to start the comment and */ to end the comment.

What should I write in comment?

Top ten tips for writing a great comment

Read the article. It sounds obvious, but you’d be surprised how many comments can be answered with the words “it says in the article”.
Respond to the article. …
Read the other comments.
Make it clear who you’re replying to.
Use the return key.
Avoid sarcasm.
Avoid unnecessary acronyms.
Use facts.

What are comments give an example of multiline comment?

Using Multi-line string as comment In the above example, the multi-line comments are used to comment more than one line. The first line is a single line comment. The second and third line can be commented using triple quotes( “”” “””” ). This prevents the execution of the above code.

How are comments written in Python?

A comment in Python starts with the hash character, # , and extends to the end of the physical line. A hash character within a string value is not seen as a comment, though. To be precise, a comment can be written in three ways – entirely on its own line, next to a statement of code, and as a multi-line comment block.

What are comments and its types in Python?

When executing a program, the Python interpreter ignores the comments and only interprets the code. Python provides three kinds of comments including block comment, inline comment, and documentation string.

What is single line comment?

Single-line comments allow narrative on only one line at a time. Single-line comments can begin in any column of a given line and end at a new line or carriage return. The // character sequence marks the text following it as a single-line comment. Here’s an example.

How do you comment multiple lines on a python keyboard?

6 Answers

Single line comment. Ctrl + 1.
Multi-line comment select the lines to be commented. Ctrl + 4.
Unblock Multi-line comment. Ctrl + 5.

How do you comment multiple lines in an atom?

Atom does not have a specific comment-block function, but if you select more rows and then use the normal ctrl – / (Windows or Linux) cmd – / (Mac), it will comment all the lines. and now it works! Also, there are packages: Comment package for atom (https://atom.io/packages/comment)

How do you add a comment in R code?

How to add multi-line or block comments in R? There is also a short cut for this; so, after selecting your code you can just click Ctrl + shift + C and voilà. Your code is commented.

How do you comment out a section in Matlab?

If you are using the MATLAB editor, you can highlight the block of code that you want to comment then select the “Text->Comment” menu item or type a Control-R to comment the whole block. To uncomment the block, once again select the block of code, select “Text->Uncomment” or type Control-T key combination.

How do I run code in R?

Click the line of code you want to run, and then press Ctrl+R in RGui. In RStudio, you can press Ctrl+Enter or click the Run button. Send a block of highlighted code to the console. Select the block of code you want to run, and then press Ctrl+R (in RGui) or Ctrl+Enter (in RStudio).

How do I run code?

Usages

To run code: use shortcut Ctrl+Alt+N. or press F1 and then select/type Run Code , or right click the Text Editor and then click Run Code in editor context menu.
To stop the running code: use shortcut Ctrl+Alt+M. or press F1 and then select/type Stop Code Run.

Is Python better than R?

Since R was built as a statistical language, it suits much better to do statistical learning. Python, on the other hand, is a better choice for machine learning with its flexibility for production use, especially when the data analysis tasks need to be integrated with web applications.

How do I write code in R studio?

The RStudio interface is simple. You type R code into the bottom line of the RStudio console pane and then click Enter to run it. The code you type is called a command, because it will command your computer to do something for you. The line you type it into is called the command line.

What is R script?

An R script is simply a text file containing (almost) the same commands that you would enter on the command line of R. ( almost) refers to the fact that if you are using sink() to send the output to a file, you will have to enclose some commands in print() to get the same output as on the command line.

Is R Studio free?

RStudio provides free and open source tools for R and enterprise-ready professional software for data science teams to develop and share their work at scale.

What is R console?

The console window (in RStudio, the bottom left panel) is the place where R is waiting for you to tell it what to do, and where it will show the results of a command. You can type commands directly into the console, but they will be forgotten when you close the session.

Do I need both R and RStudio?

R and RStudio are both free, open-source software, available for all commonly used operating systems. Regardless of your operating system, you should install R before installing RStudio.

How do you comment in code?

The single line comment is //. Everything from the // to the end of the line is a comment. To mark an entire region as a comment, use /* to start the comment and */ to end the comment. * This is a block comment.

How does the single line comment look like?

Single line comments begin with two forward slashes. Documentation comments begin with a forward slash and two asterisks and end with an asterisk and forward slash.

What are the two types of comments?

We have two types of comments here, the end-of-line comment and the block comment. An end-of-line comment terminates at the end of the line. A block line comment has a terminator and can continue for several lines, or be less than one line. Comments were called REMarks in BASIC.

What differentiates a good comment from a bad comment?

What differentiates a good comment from a bad comment? A good comment tells the reader why this particular code is doing whatever it is doing or explains what a section of code is about to do. A bad comment restates what a particular line of code is doing.

How do you write a bad comment?

7 ways to write bad comments

contain syntax or grammar errors.
are verbose, taking up too much space.
are too numerous, adding clutter.
duplicate the code.
explain awkward logic.
contradict the code.
are otherwise out-of-date with respect to the code.

What are code comments?

In computer programming, a comment is a programmer-readable explanation or annotation in the source code of a computer program. They are added with the purpose of making the source code easier for humans to understand, and are generally ignored by compilers and interpreters.

Are comments in code necessary?

While it’s true that humans need to be able to comment code, it is not absolutely necessary that the language directly support commenting: for most languages, it would be trivial to write a script that deletes one line comments (for example, all lines beginning with ‘#’ or some other character) then runs the compiler.

Are code Comments bad?

Commenting code is on the generally-recognized list of code smells. But unlike most of the others on the list, comments are not always bad. Generally speaking, you should strive to minimize comments and let the code speak for itself, but it is just as important to include comments when the code cannot.

Why comments are important in coding?

Comments are text notes added to the program to provide explanatory information about the source code. They are used in a programming language to document the program and remind programmers of what tricky things they just did with the code and also helps the later generation for understanding and maintenance of code.

Which is better too many comments or too few comments?

Too many comments may be bad, if the comments do not add information about how the code works. Extra comments do not hurt anything. But too few comments is much worse, because even the author of some code cannot really understand it completely after a few months.

What are comments give an example of multiline comment?

print(“Hello, World!”) As long as the string is not assigned to a variable, Python will read the code, but then ignore it, and you have made a multiline comment.

Which syntax is used to comment JSP?

How to write a comment in a JSP page?

S.No.	Syntax & Purpose
1	<%– comment –%> A JSP comment. Ignored by the JSP engine.
2	An HTML comment. Ignored by the browser.
3	<\% Represents static <% literal.
4	%\> Represents static %> literal.

What are JSP comments?

JSP comment marks text or statements that the JSP container should ignore. A JSP comment is useful when you want to hide or “comment out”, a part of your JSP page.

What is the difference between hide comment and output comment?

A comment that is sent to the client in the viewable page source(it is appear in the output). Hidden Comment: A comments that documents the JSP page but is not sent to the client(it is not appear in output ).

What is JSP declaration?

A JSP declaration is used to declare variables and methods in a page’s scripting language. The syntax for a declaration is as follows: <%!

Which one is declaration tag?

Declaration tag is one of the scripting elements in JSP. This Tag is used for declare the variables. Along with this, Declaration Tag can also declare method and classes. JSP container keeps this code outside of the service method (_JSPService()) to make them class level variables and methods.

What is difference between Scriptlet and expression?

We use Expression in a JSP to return a value and display it at a specific location. It is generally used for dynamically print information like- time, counter etc in a HTML code. Scriptlet is for writing Java code in a JSP.

What is Scriptlet tag in JSP?

Scriptlet tag allows to write Java code into JSP file. For each request of the client, service method of the JSP gets invoked hence the code inside the Scriptlet executes for every request. A Scriptlet contains java code that is executed every time JSP is invoked.

What are directives in JSP?

JSP directives are the messages to JSP container. They provide global information about an entire JSP page. JSP directives are used to give special instruction to a container for translation of JSP to servlet code. Directives can have many attributes by comma separated as key-value pairs.

What is declaration in Java?

Updated January 09, 2019. One kind of Java statement is a declaration statement, which is used to declare a variable by specifying its data type and name. Below are some examples of declaration statements. A variable, in relation to Java programming, is a container that holds values used in a Java program.

What is difference between declaration and definition?

For a variable, declaration means just stating its data type along with giving it name for memory allocation; while definition means giving the value of that variable.

What is difference between initialization and declaration?

For a variable, a definition is a declaration which allocates storage for that variable. Initialization is the specification of the initial value to be stored in an object, which is not necessarily the same as the first time you explicitly assign a value to it.