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 true2. 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 100How 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, -987double– is a decimal number e.g 987.00 or -987.00char– 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, -987float– is a decimal number e.g 987.00 or -987.00char– 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 157. 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.
