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The Basics of Integers and Doubles in Swift: A Beginner's Guide 📚

Updated: Mar 25, 2023

Join us for a journey through the world of Swift data types, where we explore the basics of Integers and Doubles, and how they can power up your code!


Are you new to Swift and wondering about the basics of data types? Then get ready for an easy journey, where we explore the world of Integers and Doubles.





With simple explanations and examples, we’ll learn how to use these data types in your code, and how they can help you solve problems with ease.

Let’s get started! 🚀

  1. Integers: The Basics of Whole Numbers 🧮

Integers are like boxes that can hold whole numbers, like 1, 2, 3, and so on. They can be positive or negative, and they are useful for counting, indexing, and other tasks that involve whole numbers.


In Swift, you can create an Integer variable using the keyword “var”, like this:

var score: Int = 0

This creates a variable called “score” that holds an Integer value of 0. You can change the value of the variable later in your code, like this:


score = 10

This changes the value of the “score” variable to 10. You can also create a constant Integer using the keyword “let”, like this:


let numberOfPlayers: Int = 4

This creates a constant called “numberOfPlayers” that holds an Integer value of 4. You can’t change the value of a constant once it’s set.

  1. Doubles: The Basics of Decimal Numbers 🧮

Doubles are like boxes that can hold decimal numbers, like 3.14, 1.5, and so on. They are useful for calculations that involve fractional numbers, like measurements, currency, and more.


In Swift, you can create a Double variable using the keyword “var”, like this:

var height: Double = 1.75

This creates a variable called “height” that holds a Double value of 1.75. You can change the value of the variable later in your code, like this:

height = 1.85

This changes the value of the “height” variable to 1.85. You can also create a constant Double using the keyword “let”, like this:

let pi: Double = 3.14159

This creates a constant called “pi” that holds a Double value of 3.14159. You can’t change the value of a constant once it’s set.

  1. Combining Integers and Doubles: Mixing Whole and Decimal Numbers 🧮

What if you need to use both whole and decimal numbers in your code? No problem, you can mix Integers and Doubles in your calculations!

In Swift, if you perform a calculation between an Integer and a Double, Swift will automatically convert the Integer to a Double, like this:

let distance: Double = 10.0
let time: Int = 2
let speed: Double = distance / Double(time)

In this example, we have a distance of 10.0, and a time of 2, which is an Integer. When we divide distance by time, Swift automatically converts time to a Double, so we end up with a speed of 5.0.

  1. Epilogue: The Power of Integers and Doubles in Swift 🧮

And there you have it, beginner coders! You’ve learned the basics of Integers and Doubles in Swift, and how these data types can power up your code and make calculations much easier.

Now, you can create variables and constants for whole numbers and decimal numbers, mix and match them in your calculations, and solve problems with ease.


With this knowledge, you’re ready to take on more complex coding challenges and explore other Swift data types. So go forth, young coder, and have fun exploring the world of Swift! Happy coding! 🚀

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