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iOS Swift Basics Swift Types Recap: Swift Types

how do i write a multiplication equation and is that an int, bool, etc?

i dont understand

types.swift
// Enter your code below
let firstValue: Int = 5
let secondValue: Int = 3
let product: Int = 
Micah Howard
Micah Howard
23,770 Points

Here is one solution:

let firstValue = 5
let secondValue = 3
let product = firstValue * secondValue
let output = "The product of \(firstValue) times \(secondValue) is \(product)."
Michael Williams
Michael Williams
Pro Student 8,059 Points

First, you're doing great! You're almost there and Micah's code is what you're looking for to solve your problem. But seek understanding rather than copy/pasting the code, no matter how tempting it is to do otherwise.

Secondly, could you help us understand what it is that you aren't understanding? In the meantime...

You would want to use Int for integers/numbers, which is correct in the code you've provided. However, if you're multiplying numbers with decimals, you'd want to use Double, because you can't multiply variables or constants of two different types. In other words, the following code would give you an error because one is a double and the other is an int:

let x: Int =  2
let y: Double = 3.15
let product = x * y

Of course there are ways around things, but don't worry about that yet. Focus on getting the basics down first.

You wouldn't want to use a Bool because that's for things that would evaluate to either true`` orfalse`` For example, say you could create some code that said a light switch is on:

var lightSwitchIsOn: Bool = true

Now you have a variable that says the light switch is on. You'll learn about this more later, but then you could write more code that depending on whether the light swtich is on or not would perform a simple task. You could even write it to make lightSwitchIsOn evaluate to false, letting us know it's off.

1 Answer

Thank you so much! this has been truly insightful. I appreciate both of your time and patience!!