Swift
Basic Syntax -
var str = "Hello world!"
var x = 10
Data Types -
- Int
- Float
- Double
- Bool
- String
- Character
- Optional
- Tuples
| Type | Typical Bit Width | Typical Range |
|---|---|---|
| Int8 | 1byte | -127 to 127 |
| UInt8 | 1byte | 0 to 255 |
| Int32 | 4bytes | -2147483648 to 2147483647 |
| UInt32 | 4bytes | 0 to 4294967295 |
| Int64 | 8bytes | -9223372036854775808 to 9223372036854775807 |
| UInt64 | 8bytes | 0 to 18446744073709551615 |
| Float | 4bytes | 1.2E-38 to 3.4E+38 (~6 digits) |
| Double | 8bytes | 2.3E-308 to 1.7E+308 (~15 digits) |
Type Aliases
typealias Feet = Int
typealias Feet = Int var distance: Feet = 100 print(distance)
// 100
Type Safety
Type Inference
Variable Declaration
- var
- let
Type Annotations
We can provide atype annotationwhen we declare a variable, to be clear about the kind of values the variable can store.
Printing Variables
var varA = "Godzilla" var varB = 1000.00
print("Value of (varA) is more than (varB) millions")