Julia Variables & Data Types
Learn about variables, constants, and Julia's type system.
Variable Declaration
# Variable assignment
x = 10
name = "Julia"
pi_approx = 3.14159
# Constants (conventionally uppercase)
const SPEED_OF_LIGHT = 299792458Basic Data Types
| Type | Example | Description |
|---|---|---|
| Int | 42 | Integer (platform-dependent size) |
| Float64 | 3.14 | 64-bit floating point |
| Bool | true, false | Boolean value |
| Char | 'J' | Unicode character |
| String | "Hello" | UTF-8 encoded string |
Type Conversion
x = 3.14
y = Int(x) # 3 (truncates)
s = "123"
n = parse(Int, s) # Convert string to integerType Annotations
# Variable with type annotation
x::Float64 = 3.14
# Function with type annotations
function add(a::Int, b::Int)::Int
return a + b
end