Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Swift Basics Swift Types Recap: Swift Types

Tiffany Theriot
Tiffany Theriot
549 Points

String Interpolation Swift Basics

What am I missing in this practice??

Using these values, we want to compute the product and print out the product in a formatted string.

Step 1: Declare a constant named product and assign the result of multiplying firstValue and secondValue together. (To multiply two values, a and b, we write a * b).

Step 2: Using string interpolation, create a string literal that describes the operation we just performed. For example, given the following values for firstValue, secondValue and product respectively: 2, 4, 8. The string should read: "The product of 2 times 4 is 8". Assign this string to a constant named output.

let firstValue: Int = 10 let secondValue: Int = 20 let product: String = "firstValue * secondValue" let output: String = "The product of", firstValue, "times", secondValue, "is", product

types.swift
// Enter your code below
let firstValue: Int = 10
let secondValue: Int = 20
let product: String = "firstValue * secondValue"
let output: String = "The product of", firstValue, "times", secondValue, "is", product

2 Answers

Steven Parker
Steven Parker
211,156 Points

Here's a few hints:

  • it might work better to make "product" be a numeric value instead of a string
  • the instructions say to use string interpolation to create the "output"
  • for interpolation, there should be only one string being assigned
  • to interpolate variables, their names should be made into tokens (like: "The value is \(variable)")

For the first part of the challenge, although you have a correct answer, it is not necessary to explicitly declare firstValue and secondValue as Ints.

let firstValue = 1

let secondValue = 2

let product = firstValue * secondValue

let output = "The product of \(firstValue) times \(secondValue) is \(product)"