Swift Double

// Implicit type inference
let inferredValue = 3.141592653589793 // Type is Double

// Explicit type annotation
let explicitValue: Double = 2.718281828459045

// Scientific notation literal
let scientificValue: Double = 1.25e-4 // Represents 0.000125

// Hexadecimal floating-point literal
let hexValue: Double = 0xFp2 // Represents 15 * 2^2 (60.0)

let positiveInf: Double = .infinity      // Represents positive infinity
let negativeInf: Double = -.infinity     // Represents negative infinity
let notANumber: Double = .nan            // Represents an undefined result (Not a Number)
let zeroValue: Double = .zero            // Represents 0.0
let piValue: Double = .pi                // Represents the mathematical constant Pi

let value: Double = 0.0 / 0.0

let isNaN = value.isNaN           // true
let isInfinite = value.isInfinite // false
let isFinite = value.isFinite     // false
let isZero = value.isZero         // false

import CoreGraphics

let integerValue: Int = 42
let floatValue: Float = 9.99
let cgFloatValue: CGFloat = 15.5

// Explicit conversion required for Int and Float
let doubleFromInt = Double(integerValue)
let doubleFromFloat = Double(floatValue)

// Implicit conversion supported for CGFloat
let doubleFromCGFloat: Double = cgFloatValue
let cgFloatFromDouble: CGFloat = doubleFromInt

// Explicit conversion from Double to Int
let doubleValue: Double = 10.75
let truncatedInt = Int(doubleValue) // Evaluates to 10 (truncates toward zero)