Double-precision, Floating-point numbers are numbers that have fractional parts (usually expressed with a decimal point). You should use a floating-point type in Swift programs whenever you need a number with a decimal, such as 24.02 or 3.25.
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An integer (from the Latin integer meaning “whole”) is a number that can be written without a fractional component. For example, 3, 4, -7, and -1024 are integers, while 0.15, 1/2 , and √5 are not. Integers are either signed (positive, zero, or negative) or unsigned (positive or zero).
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In this article we will learn about variables and constants in the Swift programming language. Swift uses variables to store and refer to values by an identifying name. Swift also makes extensive use of variables whose values can’t be changed.
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To run examples and instructions for programming Swift on iOS, tvOS, watchOS and MacOS, we will show you how to prepare a development environment with Xcode 10.2.
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Swift is a new open source programming language developed by Apple .Inc for iOS, macOS X, watchOS, and tvOS app development. Swift 4 adopts the best of C and Objective-C, without the constraints of C compatibility.
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