Formatted Output

Part of the Fundamentals section of Coddy's Swift journey — lesson 41 of 86.

Challenge

Easy

In the previous lesson, you calculated how much each person pays. Now, format the monetary values to display exactly 2 decimal places for a polished, professional output.

Use Swift's String(format:) to format the tipAmount, totalWithTip, and amountPerPerson values to show exactly 2 decimal places.

The format specifier "%.2f" formats a Double to 2 decimal places:

let formatted = String(format: "%.2f", someDouble)

Update your output to print in this exact format:

Welcome to the Bill Split Calculator!
Bill: [billTotal]
Tip: [tipPercentage]%
People: [numberOfPeople]
Tip amount: $[tipAmount formatted]
Total with tip: $[totalWithTip formatted]
Each person pays: $[amountPerPerson formatted]

Notice the $ symbol is now added before each monetary value, and all amounts show exactly 2 decimal places.

For example, if the inputs are 85.5, 15, and 3, the output should be:

Welcome to the Bill Split Calculator!
Bill: 85.5
Tip: 15%
People: 3
Tip amount: $12.83
Total with tip: $98.33
Each person pays: $32.78

Try it yourself

print("Welcome to the Bill Split Calculator!")

if let billInput = readLine(), let billTotal = Double(billInput) {
    if let tipInput = readLine(), let tipPercentage = Int(tipInput) {
        if let peopleInput = readLine(), let numberOfPeople = Int(peopleInput) {
            let tipAmount = billTotal * Double(tipPercentage) / 100
            let totalWithTip = billTotal + tipAmount
            let amountPerPerson = totalWithTip / Double(numberOfPeople)
            
            print("Bill: \(billTotal)")
            print("Tip: \(tipPercentage)%")
            print("People: \(numberOfPeople)")
            print("Tip amount: \(tipAmount)")
            print("Total with tip: \(totalWithTip)")
            print("Each person pays: \(amountPerPerson)")
        }
    }
}