Variables and Constants in Swift – 1

By reading this article your following problems will be answered.

Variables

1. var result: Int
2. var number1: Int = 10
3. var number2 = 80

A variable can be defined by just mentioning the data type as in the line 1.
Also we can specify the value of the respective variable after defining the type, as in the line 2
Else, as in the line 3, we can just define the variable by giving it an initial value, so it can automatically identify the variable’s data type by referring to the given initial value.

let label: String = "The language is "
let language = “swift"

We can call the constant name to retrieve the values stored in the constant like we do with a variable.
But we can’t change the value of a constant.

Data type	Decription
Character	A single character.
String	Text
Int	A whole number. (Not a decimal.)
Float	A 32-bit floating point number. (That means a 32-bit decimal number.)
Double	A 64-bit floating point number. (That means a 32-bit decimal number.)
Bool	Just true of false

Swift data types

let version: Int = 1
String(version)

To combine variables or constants with different data types, all the variables and constants need to be the same data type, otherwise we have to convert the data type as below.
To use multiple data types at once, we can either do as follows.

let version: Int = 1
let label = “Version is “
var message = label + String(version)

Or we can include the value with another data type in parentheses and add a back slash before them.

let version: Int = 1
let label2 = "Version is "
var message = label2 + "\(version)"

let number1 = 200
let number2 = 300
var result = "Result is: + \(number1 + number2) "

let FirstName: string? = “Joe”
let  SurName: string? = nil

var num1 = 100, num2 = 200, num3 = 300
var cat1, cat2, cat3: String

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