Operators in Swift

Operators:

An Operator a special symbol that tells the compiler to perform mathematical or logical operations.

Assignment Operator:

The assignment operator (a=b) initailizes or updates the vlaue of a with a vlue of b.

let b = 12

var a = 10

a = b  // a is now 12

Arithmetic Operators :

Swift supports 4 arithmetic operators.

Addition

Subtraction

Multiplication

Division

Remainder Operator :

9 % 4 = 1

5 % 1.5 = 0.5

Comparison Operator :

Equal to (a == b)

Not equal to (a != b)

Greater than (a > b)

less than (a < b)   .................etc

Ternary Conditional Operator :

Ternary conditional operator is a special operator with 3 parts.

question ? answer 1 : answer 2

if question {

answer 1

} else {

answer2

}

if question is true, it evaluates answer 1, otherwise, it evaluates answer 2.

Range Operators:

Closed Range Operator:

The closed range operator (a...b) defines a range from a to b,incluses vlues a and b.

ex:

  for index in 1...6 {

 

  print("\(index) times 6 is \(index * 5)")

  }

 

  // 1 times 5 is 5

  // 2 times 5 is 10

  // 3 times 5 is 15

  // 4 times 5 is 20

  // 5 times 5 is 25

 

  Half- Open range operator :

 

  The half open range operator (a..<b) defines a range from a to b, but does not include b.

let countrynames = ["India","Malaysia","USA","Singapore","Thailand"]

 let count =  countrynames.count

 for i in 0..<count {

print("Country \(i+1) is called \(countrynames[i])")

}

// Country 1 is called India

// Country 2 is called Malaysia

.

//// Country 5 is called Thailand

Logical Operators :

Logical operators are similar to c, java languages.

Logical NOT (!a)

Logical AND (a && b)

Logical OR (a || b)