Declare a Variable

C#

In C#, a variable declaration follows this format:

_{🤖 Pseudocode}

<DATA_TYPE> <NAME> = <VALUE>;

1. <DATA_TYPE>: The type of value the variable will hold (e.g., number, text, boolean).
2. <NAME>: A recognizable name for the variable.
3. <VALUE>: The initial value to store (optional; a variable can also be declared without an initial value).

// An integer variable named score with the initial value of 0.
int score = 0;

// A string variable named username with the initial value of "Ze".
string username = "Ze";

// A boolean variable named named isAlive with the initial value of true.
bool isAlive = true;

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Once declared, you can reference a variable by its name to read or update its value:

score = score + 10;          // update
Console.WriteLine(score);    // read / display

Python

In Python, variables are dynamically typed, meaning you do not need to specify a data type when declaring a variable. The type is inferred from the value assigned.

_{🤖 Pseudocode}

<NAME> = <VALUE>

Examples
score = 0             # integer
username = "Ze"       # string
is_alive = True       # boolean

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Once declared, you can reference a variable by its name to read or update its value:

score += 10           # update
print(score)          # read / display

JavaScript

In JavaScript, you can declare variables using var, let, or const.

• var: Older syntax, function-scoped.
• let: Modern syntax, block-scoped, used for variables that can change.
• const: Block-scoped, used for values that won’t change.

_{🤖 Pseudocode}

<KEYWORD> <NAME> = <VALUE>;

Examples
let score = 0;           // variable that can change
const username = "Ze";   // constant variable
var isAlive = true;      // older syntax

ℹ️ Use let for most variables in modern code and const for values that should remain constant.

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Once declared, you can reference a variable by its name to read or update its value:

score += 10;            // update
console.log(score);     // read/display

Related Concepts

• Uses: Data Type
• Uses: Variable
• Mentions: Naming Variables
• Performs: Variable Declaration