Lesson Variables

variables
Swiftplayground
Week 2

Computer Science - CSC400

Objectives

• Define variables as a value that can change, depending on conditions or on information passed to the program under the Swift programming platform.

• Identify different types of variables used to store data in Swift programming platform and the way to parse data between them.

• Declare a variable and assign a value to it using the Swift programming platform syntax to hold a specific data within a program

Objectives

• Declare Constants using let command in Swift Programming platform to hold a non-changing variable value.

• Use the assignment operator (=) to assign a new value to a variable in a program that matches its defined data type

• Identify the scope of the local variables in a programming as an indication of how accessible a variable is to a function or another call within the same program.

• Perform arithmetic, increment, decrement, comparison between variables and logical operators to perform different operations on variables

Define variable

Variable : A named container that stores a value. The value can change over time.

Multiple Choice

Which of the following is the correct definition of a variable?

• A function that performs calculations

• A storage location in memory with a specific name

• A type of loop that repeats actions

• A collection of data items

Types of variable

let name = "Ahmad". // String
var age = 15 // Integer
var height = 1.6 // float
var isOnClosedSwitch = true //Boolean

Multiple Choice

Which of the following types is a String?

• let name = "Sara"

• var age = 15

• let speed = 80.5

• var isBlocked = false

Multiple Choice

Which of the following types is a float?

• let name = "Sara"

• var age = 15

• let speed = 80.5

• var isBlocked = false

Multiple Choice

Which of the following types is a boolean?

• let name = "Sara"

• var age = 15

• let speed = 80.5

• var isBlocked = false

Multiple Choice

Which of the following types is an integer?

• let name = "Sara"

• var age = 15

• let speed = 80.5

• var isBlocked = false

Declare a constant

Constant: A named Container that stores a value that can't be changed
example:
let name = "Amna"
Variable : a variable that can be modified later
example :
var EnglishMark = 90

Multiple Choice

In Swift programming, what keyword is used to declare a variable that can be modified later?

• const
  

• var

• let

• mut

Multiple Choice

How do you declare a constant in Swift?

• constant myValue = 10

• static myValue = 10

• let myValue = 10

• final myValue = 10

Swift playground

Solve Swift playground :
Keeping Track
Bump up the Value
Incrementing the Value

Open Ended

Search on the internet and write what are the rules of Naming variable?