How To Write Variables in Different Programming Languages

Hey guys

In today’s lesson, we will walk through how to write variables in 7 different programming languages. Since variables in programming are indispensable when coding.

What Are Variable in Programming?

Variables are just a way to save data or information for usable purposes. Variable makes a program to be more clear to read by the coder

and others. All programming languages have their own way to write and execute a  variable.

Nevertheless, am going to mention how to write a variable in PHP, JavaScript, Python, Java, C#, C++, and CSS.

1. How To Write a Variable in JavaScript

JavaScript accepts a string, integer, float, Boolean, etc. to be stored in a variable. Variable can be declared in JavaScript using let , constand var. The const is sometimes referred to as constant in JavaScript.

Let’s Do Some Example

JavaScript Variables

Using the var , let and const to declare different type of Data types in JavaScript Respectively.

var strg= "Erisanal.com" 
const num = 100 
let bolln = true 

console.log(strg) //Output Erisanal.com
console.log(num) //Output 100
console.log(bolln) //Output true

2. How To Write a Variable in PHP

To declare a variable in PHP, you must start with the $ sign followed by the name of the variable, the equal to sign =is used to assign value to the variable name.

Let’s do an example

PHP Variable

<?php
// Declaring variables
$txt = "Hello World!";
$num = 100;
 
// Displaying variables value
echo $txt;  // Output: Hello World!
echo $num; // Output: 100;

?>

2. How to declare a constant variable in PHP

Unlike JavaScript, the const keyword is used to define a constant variable, but in PHP is completely different. Thedefine( ) function is used to define a varibale in PHP whick takes three parameters as an argument.

Syntax

define(name, value, case-insensitive)

PHP define( ) Parameter Explained

• name: This is the first parameter that serves as the name of your variable
• value: This is the data you want to store in the variable, this can be an integer, boolean strings, or any PHP data types.
• case-insensitive: This is optional, this is used to enable and disable case-sensitive and case-insensitive respectively. This parameter only accepts a boolean value (i.e true or false). The default is false which means the variable is case-insensitive. To enable case-sensitive change to true.

Let’s create a PHP constant with a case-sensitive name:

Example One.

<?php
define("Name", "Erisanal.com", true);
echo Name;
?>

Let’s create a PHP constant with a case-insensitive name:

Example Two

<?php
define("Name", "Erisanal.com", false);
echo Name;
?>

// The above code can also be written as:

<?php
define("Name", "Erisanal.com");
echo Name;
?>

3. How To Write a Variable in Python

Since Python is completely object-oriented, and not “statically typed”, it doesn’t have a command you can use to declare a variable. A python variable is declared once you have added value to it.

To assign a value to a python variable, use the equal to = sign

strg= "Erisanal.com" 
num = 100 

print(strg) #Output Erisanal.com
print(num) #Output 100

How to declare a constant variable in Python

In python, there is no support for constant variables, hence constant variables can’t be declared in python.

4. & 5. How To Write a Variable in C++ and C#

Declaring a variable in C++ and C# is strict.  both languages executes it’s variable in almost the same way.

To declare a variable in C++, and C#, the type must be specified before you assign a value to it. There are different type of variable in C++ and C#, some of these are:

• String – Are text that is surrounded by a double quote e.g “Hello World !”
• int – This is is an integer, sometimes referred to as whole numbers. Numbers without decimal such as 987, -987
• double – is a decimal number e.g 987.00 or -987.00
• char – stores single characters that are surrounded by a single quote e.g ‘Z’ or ‘a’
• bool – stores boolean value such as true and false only

Declaring a Variable in C++, and C#

Generally, All programming languages abide to using the equal to sign = to declare a variable.

Syntax

type variable = value;

Now, let’s move by creating different types of variable

C++, and C# Variable

String myWebsite = "Erisanal.com";
char myLetter = 'E';
int myNum = 905;
float myFloatNum = 2.99f;
boolean isBool = false;

6. How to declare a Variable in Java

To declare a variable is almost the same as to declare a C++ and C# variable, All these programming languages require the data type to be specified before you assign a value to it.

The difference lies in the variable type. In Java, this is how the variable type can be declared.

• String – Are text that is surrounded by a double quote e.g “Hello World !”
• int – This is is an integer, sometimes referred to as a whole number. Numbers without decimals such as 987, -987
• float – is a decimal number e.g 987.00 or -987.00
• char – stores single characters that are surrounded by a single quote e.g ‘Z’ or ‘a’
• boolean – stores boolean values such as true and false only

Declaring Java Variable

Example

int myNum;
myNum = 15;
System.out.println(myNum); //Output 15

7. How To Write a Variable in CSS

CSS also has a way it executes a variable. To declare a CSS variable is different from other programming languages variable. In most programming languages, the equal to = sign is used to assign a value to the variable while in CSS is entirely unlike.

How to Declare a CSS Variable

The column : sign is used to a assign value instead. The CSS variable is usually defined within the CSS :root { } pseudo-class.

A CSS variable usually starts from -- followed by the variable name. The var ( ) function is used to call and execute a CSS variable

Let’s quickly do an example

CSS Variable

:root {
--color : #3e5afb
}

/* Calling a CSS variable

body { 
color: var(--color)
}

Conclusion

These are how variables is been declared in the programming languages mentioned. Hope you enjoyed this post, Share your thought by commenting.