Constants and variables in c LEARNOVITA

C Sharp Variables and Constants | The Ultimate Guide

Last updated on 18th Aug 2022, Tutorials

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Manish Kiran (C# Developer )

Manish Kiran is a C# Developer expert and subject specialist who have experience with Git, WPF, WinForms, C#,.Net, SQL, .NET Development, VB, .NET Framework,.NET Core, SVN, Mercurial. His articles help the learners to get insights about the Domain.

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C# Introduction

C# is meant for the Common Language Infrastructure (CLI), that depicts feasible code and runtime climate. This allows the use of diverse undeniable-level dialects on completely different laptop stages and styles. nNormal Language Runtime (CLR) is characterized within the Common Language Infrastructure (CLI). CLR is that the Virtual Machine is half coping with the execution of comes written in dialects utilizing the .NET Framework. some of its models incorporate C#, F#, and so on The .NET ASCII text file is collective to Common Language Infrastructure (CLI). The code is dead at runtime once the CIL is modified over to native code. This can be finished utilizing the JIT (Just-In-Compiler) compiler.

A portion of the many highlights of C# square measure as per the following:

1. Object-Oriented Language: C# is an associate degree item organized language. This suggests that improvement is a lot of simple assumptions that square measure long codes in monumental ventures once contrasted with strategy set programming dialects.

2. Organized artificial language: The comes in C# are often organized by breaking them into lesser elements utilizing capacities. This makes the program clear..

3. straightforward to utilize: It is terribly straightforward to involve C# because it has completely different components and functionalities. To boot, it provides an associate degree organized methodology that creates the program clearly..

4. adaptable language: C# may be consequently adaptable additionally as updatable language. The recent records square measure habitually reinvigorated and supplanted with new ones. varied applications are often created utilizing C#. some of those square measure given as follows:.

  • Web applications
  • Window applications
  • Data set applications
  • Appropriated applications
  • Web administration applications

Benefits of C#

The object programming language C# has a wide range of applications and several standards. There are several advantages to this language. These are listed in part as follows:

  • The fact that C# offering a programmed trash assortment is one of its advantages.
  • In C#pointers are not required, although they can still be used at your discretion.
  • In C#classes can be described inside of other classes.
  • The use of “.h” in header documents is not necessary.
  • Because non-boolean factors cannot be used as conditions, projects are less likely to make mistakes.
  • Reflection capabilities in C# include the ability to analyze and modify a program’s structure while it is running.
  • Declaring capabilities and classes in C# runtime is not necessary..
  • In every C# request, classes and capabilities can be described.
  • In C#, the programmes can run in a constrained sandbox.
  • Before they are used, all of the variables in C# are afterwards set to their default values.
  • In C#, there are no global variables or capacity because each belongs to a specific class.

How is C# not quite the same as C?

C# Introduction

Both C# and C are programming languages. Recursion, structured programming, lexical variable degree, and other programming constructs are supported by the widely applicable computer language C. C# is a widely applicable article-based programming language with features including trash collection, adaptability assistance, type wellbeing, easier sort presentations, and more. In general, C and C# have more contrasts than similarities and are highly different from one another.

What is the extent of C#

C# could be a universally helpful article organized artificial language with numerous ideal models. it absolutely was meant for Not surprising Language Infrastructure (CLI) in 2000 by Microsoft. C# has stupendous extension significantly since its .NET adaptation was created open supply as recently. Besides, C# is extremely easy to appreciate and contributes colossally to its presence. In addition, it has numerous components that allow the formation of solid framework elements. some of those components are:

Object-Oriented LanguageC# is a piece of writing organized language. This means that advancement is a lot of simple assumptions where there are unit long codes in monumental activities once contrasted with system set programming dialects.

Organized artificial language

The comes in C# is organized by breaking them into minor elements utilizing capacities. This makes the program a lot more obvious.

Scalable language

Scala – functional programming

C# could be a naturally versatile language similar to an updatable language. The previous documents are habitually reinvigorated and supplanted with new ones. C# could be a seriously notable language because it is used for internet improvement, transportable advancement, and then forth Likewise WPF, UWP, WinForms, and then on is used to form totally different Windows applications. Android, iOS applications is unreal utilizing the C# transportable flip of events. So, C# is used to form any type of programming. some of the streams within which C# is used area unit semisynthetic learning ability, cloud applications, AI, informatics, and so on

Why C#?

C# could be a universally helpful article set artificial language with totally different standards. it’s numerous focuses that create internet advancement arrangements faster similarly as easier. some of those area unit trash assortment, skillfulness support, sort security, easier kind assertions, and so on. There area unit totally different motivations to use C#. some of those area unit given as follows:


C# is ostensibly quite presumably the foremost known idiom within the gift day time. It’s used for internet advancement, moveable improvement, and so on . In addition WPF, UWP, WinForms, and so on are used to create completely different Windows applications. Android, iOS applications is created utilizing the C# moveable flip of events.

So, C# is utilized to create any form of programming. a little of the streams during which C# is used to measure artificial consciousness, cloud applications, AI, science, and so forth.

Simplicity of Learning

C# is extremely straightforward to find out and might be effortlessly perceived. It okay is also dominated in an exceedingly somewhat transient time-frame, notably for the people that as of currently have some involvement in programming dialects. in addition, C# and Java square measure terribly comparative lingually and therefore the people World Health Organization square measure knowledgeable in Java will beyond any doubt comprehend C#.

Pay Scale

C# package engineers associate degreed designers work with C# in an application and advancement limit. They add associate degree assortment of organizations with assignments, for instance, coding, planning, testing, so forth, and procure likewise

Factors in C#

How to Find all Factors of a Given Number in C#

Factors square measure the names utilized for the capability regions that square measure controlled by the comes to induce completely different outcomes. There square measures numerous types of factors like importance, drifting purpose, boolean, character so forth The variable kind decides the dimensions and style of the variable memory.

Variable Definition and low-level formatting

A variable is characterized utilizing the related to punctuation:

DataType VariableList

Here, “DataType” is any substantial C# data sort, for instance, int, float, twofold, roast, bool, so forth “VariableList” could contain a minimum of one variable name isolated by commas. Factors are instated utilizing the task administrator with the variable name on its left facet and therefore the price relegated on its right facet. this can be displayed as follows:

A summary of legitimate and invalid variable names is as per the following:

  • int var;//Valid
  • int _var;//Valid
  • int var1;//Valid
  • int name_var_1;//Valid
  • int 10;//Invalid
  • int 10val;//Invalid
  • int name power unit 1;//Invalid
  • int switch;//Invalid

Perusing input from Console

The capability ReadLine() within the Console category within the System namespace is used to acknowledge input from the consumer and store it into a variable. This could be potential by composing Console.ReadLine() to acknowledge the consumer input. Even so, this acknowledges the contribution to string style so Convert.ToInt32() is used on account of int data sorts to vary the contribution over to int. A program to exhibit this can be as per the following:

Source Code: Program to examine input from Console in C#

  • utilizing System;
  • namespace Demo {
  • public category Example ”, val);
  • }
  • }
  • }

The results of the higher than program for input esteem five is:

Worth of val is five

Constants in C#

Constants in a very program square measure fastened qualities that can’t be adjusted whenever they’re given. they will be variety consistent, drifting steady, character steady or string strict. Constants are often characterized utilizing the const watchword. const DataType ConstantName = esteem; Here, “const” is that the motto “DataType” are often any legitimate C# data kind, for instance, int, float, twofold, singe, bool then on “ConstantName” is the name given to the consistent. “esteem” is that the price allotted to the consistent.

C# Variables

A variable is associate identifier which means a memory space to store associate data esteem and each issue features a type that figures out what prices are often placed away within the variable. A variable may take varied|the varied|the assorted} qualities at various times throughout execution of the program. Variable names have to be compelled to be pronounced before it’s used within the program. Variable names are often chosen by developers in a very vital manner. mean is one among the variables in your program that address the mean price.

Not several variable names are:

  • length
  • width
  • stature then forth

Variable name could consists of letters so as, digits and highlight with subject to following conditions:

  • Should not begin with a digit
  • Capitalized and graphic symbol square measure clear
  • Ought not be C# watchword
  • Space isn’t permissible
  • Quite a few characters (Any length)

C# Constants

The variable whose price doesn’t change throughout the execution of a program. This C# program is employed to disclose the way to announce and introduce the factors and what is more utilizing contacts.

Compiler blunder:

Error CS0131 The left-hand facet of a task ought to be a variable, property or skilled worker Console App 2D:\C#_Programs\VariableTest.cs eighteen Active’

A variable

variables in c#

Whenever a program is running it has to work with info. as an example, Associate in Nursing calculator would ought to store the numbers a consumer contributes to possess the choice to try to to a couple of estimations. This info is in short order within the memory (RAM) of your laptop over the time period of the program. Whenever the program equals running, the data is eliminated from memory. we have a tendency to store this info into info holders like factors and constants. contemplate a variable a bit box.

You can place one thing within the case. You can eliminate the substance whenever to figure with. You can amend the substance within the instrumentality whenever. You will offer the case to a different person so that they can get things finished. In C# we will store one type of factor in an exceedingly instrumentality, as an example, a case will hold shoes. to position socks in there too we might need a brand new separate box for them. we have a tendency to in addition have to be compelled to compose on the instrumentality what type of content it’ll hold and provide the case a reputation. Make (pronounce) a variable To make a variable, we have a tendency to pronounce it. To start with, we have a tendency to verify the type of knowledge it’ll hold, then, at that time, we have a tendency to offer the variable a reputation.

Language structure:

type identifier;

In the model higher than, we have a tendency to pronounce a variable referred to as shoes. the type of knowledge it’ll hold is full numbers, or numbers, thus we have a tendency to utilize the slogan int because the type. The assertion peruses: pronounce a variable named shoes of kind int We can store whole numbers during this issue from now forward. We have a tendency to not store, for example, burns like “Hi World”.

Allocate info to a variable:

Now we’ve got an Associate in Nursing empty box, ready for one thing to be placed within it. To administer info to a variable, we have a tendency to utilize the task administrator ( = ). we have a tendency to compose the variable name, trailed by the = administrator, and later on the price that we want to store.


identifier = esteem;

In the model on top of, we have a tendency to apportion the value of ten to the variable shoes.The assertion peruses: set the value of shoes reminiscent of ten We don’t verify the kind all over again. that’s on the grounds that the variable as of currently exists therefore the compiler can understand its type. The statement is simply done once nevertheless we are able to appoint qualities thereto but a lot of we have a tendency to like. In the model on top of, we have a tendency to modify the value from ten to twelve and later from twelve to sixteen. Presently the value of shoes are going to be sixteen and at this time not ten.

Instate a variable

This is referred to as instating a variable. To introduce a variable, we have a tendency to administer a value thereto whereas it’s being announced.


In the model on top of, we have a tendency to build a variable named shoes, with a value of ten. Assuming we have a tendency to understand that various factors can have similar types we are able to announce them inline.


We pronounce or instate our factors as we’d usually. But, now we have a tendency to simply verify the kind once and separate each presentation or introduction with a comma.

Var as a programmed kind:

A few factors in C# may be instated while not associated with an unequivocal type. The compiler can take a goose at the knowledge within the variable and judge its type consequently. we have a tendency to supersede the kind with the catchword power unit. An extra decision concerning the power unit is that it ought to be instated with a value. A power unit can’t be vacant once it’s announced.

Var and drifting purpose numbers:

Whenever we have a tendency to use volt-ampere with a drifting purpose range, it’ll consequently utilize twofold with its accuracy. within the event that we would have liked a float, we might have to announce a float kind expressly.


  • var num = four.999999999999995;
  • Operands, Lvalues and Rvalues

There are 2 forms of articulations in C#:

Rvalues. Operands on the proper of the task administrator because it were.


A lvalue will have a price relegated thereto. It will likewise be used to assign a price to one thing completely different. Thus, it’s permissible to inform the left and right 1/2 the task administrator. a normal illustration of a lvalue would be a variable.

The worth of the pi steady within the model higher than can’t be modified whereas the appliance is running. We have a tendency to use constants for security in our applications. We have a tendency to not like specific qualities to be accidentally completely different at runtime, just like the value of Pi, or gravity.


  • Points to recall A variable may be a changeable data compartment which will concisely hold our application’s data through runtime.
  • We should verify the type of knowledge that a variable can hold whereas proclaiming or introducing it.
  • We can utilize the programmed kind volt-ampere to permit the compiler to surmise the type from the substance of the variable.
  • A constant may be a permanent data compartment and is used after we don’t like data to alter at runtime.
  • The two forms of articulations in C# ar Lvalues and Rvalues.
  • Lvalues are the operands on the left of the = administrator.
  • Values at the operands on the proper of the = administrator.

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