Day 3 : 100DaysOfSwift🚀

Day 3

operators and conditions

Operators are special symbols that perform operations on variables and values.

1.Arithmetic Operators
Arithmetic operators are used to perform mathematical operations like addition, subtraction, multiplication.

let firstScore = 12
let secondScore = 4

Add And Subtract

let total = firstScore + secondScore
let difference = firstScore - secondScore

multiply and divided

let product = firstScore * secondScore
let divided = firstScore / secondScore

2.Compound assignment operator

var score = 95
score -= 5  //90

3.Comparison Operator
Comparison operators compare two values/variables and return a boolean result: true or false. For example,

var a = 5, b =2
print (a > b)      // true

Operator    Meaning     Example
==     Is Equal To          3 == 5 gives us false
!=     Not Equal To     3 != 5 gives us true
>      Greater Than         3 > 5 gives us false
<      Less Than            3 < 5 gives us true
>=  Greater Than or Equal To    3 >= 5 give us false
<=  Less Than or Equal To           3 <= 5 gives us true

4.Logical Operators
Logical operators are used to check whether an expression is true or false. They are used in decision-making. For example,

var a = 5, b = 6
print((a > 2) && (b >= 6))    // true

Operator Example      Meaning
&&       a && b    Logical AND:true only if both the operands are true

||  a || b     Logical OR:true if at least one of the operands is true
!     !a       Logical NOT:
true if the operand is false and vice-versa.

Condition
Example if else

let firstCard = 11
let secondCard = 10

if firstCard + secondCard == 21 {
    print("Blackjack!")
} else {
    print("Regular cards")
}

1. combining condition Swift has two special operators that let us combine conditions together: they are && (pronounced “and”) and || (pronounced “or”).

Example

let age1 = 12
let age2 = 21

if age1 > 18 && age2 > 18 {
    print("Both are over 18")
}

if age1 > 18 || age2 > 18 {
    print("At least one is over 18")
}

The ternary operator
Example

let firstCard = 11
let secondCard = 10
print(firstCard == secondCard ? "Cards are the same" : "Cards are different")

Switch statements

let weather = "sunny"

switch weather {
case "rain":
    print("Bring an umbrella")
case "snow":
    print("Wrap up warm")
case "sunny":
    print("Wear sunscreen")
default:
    print("Enjoy your day!")
}

Range operators
Swift includes two range operators, which are shortcuts for expressing a range of values. The following table explains these two operators.
1.Closed Range
(a...b) defines a range that runs from a to b, and includes the values a and b.
Example:

1...5 gives 1, 2, 3, 4 and 5

2.Half-Open Range

1..< 5 gives 1, 2, 3, and 4