Swift — Operators

Arithmetic operators

let a = 10, b = 3

print("Add: \(a + b)")   // 13
print("Sub: \(a - b)")   // 7
print("Mul: \(a * b)")   // 30
print("Div: \(a / b)")   // 3
print("Mod: \(a % b)")   // 1

Comparison operators

print(5 == 5)  // true
print(5 != 3)  // true
print(5 > 3)   // true
print(5 < 3)   // false
print(5 >= 5)  // true
print(5 <= 3)  // false

Logical operators

let a = true, b = false

print(a && b)  // false (AND)
print(a || b)  // true  (OR)
print(!a)      // false (NOT)

Range operators

// Closed range
for i in 1...5 {
    print(i, terminator: " ")
}
print() // 1 2 3 4 5

// Half-open range
for i in 0..<5 {
    print(i, terminator: " ")
}
print() // 0 1 2 3 4

// One-sided range
let arr = [10, 20, 30, 40, 50]
print(arr[2...]) // [30, 40, 50]

Nil coalescing

let name: String? = nil
let display = name ?? "Unknown"
print(display) // Unknown

Ternary operator

let x = 10
let label = x > 5 ? "big" : "small"
print(label) // big

Mini Practice

Write Swift code that:

1. Demonstrates all arithmetic operators
2. Uses range operators in a for loop
3. Uses nil coalescing for defaults
4. Shows the ternary operator

Up Next

In the next lesson, you'll learn about Booleans — logical values in Swift.