Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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
231,184 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)"