[Solved] Consider this Swift function:func describe(person: String = "Unknown", age: Int = 0) { print("\(person) is \(age) years old.") }How would you call it to print "Alice is 30 years old."? | Swift

Swift - Functions

Consider this Swift function:

func describe(person: String = "Unknown", age: Int = 0) {
    print("\(person) is \(age) years old.")
}

How would you call it to print "Alice is 30 years old."?

Adescribe(30, "Alice")

Bdescribe("Alice", 30)

Cdescribe(age: 30, person: "Alice")

Ddescribe(person: "Alice", age: 30)

Step-by-Step Solution

Solution:

Step 1: Understand parameter labels
Both parameters have labels: person and age, so calls must use labels unless underscore is used.
Step 2: Check call syntax
Only describe(person: "Alice", age: 30) uses correct labels and order. describe(30, "Alice") passes arguments in wrong order without labels. describe("Alice", 30) omits labels, causing errors. describe(age: 30, person: "Alice") swaps labels incorrectly.
Final Answer:
describe(person: "Alice", age: 30) -> Option D
Quick Check:
Use parameter labels unless underscore used [OK]

Quick Trick: Use parameter labels when calling functions with defaults [OK]

Common Mistakes:

Master "Functions" in Swift

9 interactive learning modes - each teaches the same concept differently

More Swift Quizzes

Consider this Swift function: