Int, Double, Float number types in Swift - Mini Project: Build & Apply

Working with Int, Double, and Float Number Types in Swift

📖 Scenario: You are creating a simple Swift program to understand how to use different number types: Int, Double, and Float. These types help you store whole numbers and decimal numbers with different precision.

🎯 Goal: Build a Swift program that declares variables of type Int, Double, and Float, assigns values to them, and prints their values to see how they work.

📋 What You'll Learn

Declare an Int variable named wholeNumber with the value 42.

Declare a Double variable named decimalNumber with the value 3.14159.

Declare a Float variable named smallDecimal with the value 2.718.

Print all three variables with descriptive text.

💡 Why This Matters

🌍 Real World

Understanding number types is essential for any app that works with calculations, measurements, or data input.

💼 Career

Many programming jobs require knowledge of how to handle different numeric data types correctly to avoid errors and ensure precision.

1

Declare an Int variable

Create a variable called wholeNumber of type Int and set it to 42.

Swift

# Your code here

Need a hint?

Use var to declare a variable and specify the type Int with a colon.

2

Declare Double and Float variables

Add a variable called decimalNumber of type Double with the value 3.14159, and a variable called smallDecimal of type Float with the value 2.718.

Swift

var wholeNumber: Int = 42
# Your code here

Need a hint?

Remember to specify the type after the variable name with a colon, and assign the correct decimal values.

3

Print the variables

Use three print statements to display the values of wholeNumber, decimalNumber, and smallDecimal with descriptive text. For example, print "Whole number: 42" for wholeNumber.

Swift

var wholeNumber: Int = 42
var decimalNumber: Double = 3.14159
var smallDecimal: Float = 2.718
# Your code here

Need a hint?

Use string interpolation with \(variableName) inside the print statements.

4

Run and see the output

Run the program to display the values of wholeNumber, decimalNumber, and smallDecimal.

Swift

var wholeNumber: Int = 42
var decimalNumber: Double = 3.14159
var smallDecimal: Float = 2.718
print("Whole number: \(wholeNumber)")
print("Decimal number: \(decimalNumber)")
print("Small decimal: \(smallDecimal)")
# Run the program

Need a hint?

Check the console output matches the expected text exactly.