Unit 2: Naming & Identifiers

Question 1

Assignment

Answer 1

used to give a name a value when you first declare a name or when you update a variable’s value

Question 2

Constant

Answer 2

an identifier that’s immutable

Question 3

Declaration

Answer 3

introduces a new name or construct into your program

used to introduce functions, methods, variables, and constants, as well as to define new named types

Question 4

Identifier

Answer 4

refers to a value, function, type or any other abstraction

a formal word for a name in code

Question 5

Keyword

Answer 5

a term that has a special meaning in Swift and can’t be used for any other purposes

e.g.,

func (keyword) can’t be used in this example:

var func

Question 6

Pet Problem

Answer 6

Using Xcode, I can create a playground that details the number of animals available for the show.

E.g.,

//Number Of Dogs 
5

//Number of Cats
4

//Number of Turtles 
3

計算モード

// Total Number of Animals 
5+4+3                                   12

//Total Number of Mammals 
5 + 4                                      9

Question 7

Defining a Constant

Answer 7

To define a constant, please follow the example below:

Let numberOfDogs = 6
Let numberOfCats = 5
Let numberOfTurtles = 2
Let numberOfHamsters = 1

*After defining a constant and assigning a value to it, you can use the constant wherever you would have used the value, including in mathematical calculations that define the value of a new constant: