Published May 31 2021
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This tutorial belongs to the Swift series
In Swift, numbers have 2 main types:
Int is a number without decimal point.
Double is a number with decimal point.
Both use 64 bits, on modern computers that work with 64 bits, and 32 bit on 32-bit platforms.
The range of values they can store depends on the platform used, and can be retrieved using the
int property of each type:
Then, in addition to
Double, we have lots of other numeric types, mostly used to interact with APIs built in the past and that needed to interact with C or Objective-C, and you must be aware that we have them:
Int8 is an integer with 8 bits
Int16 is an integer with 16 bits
Int32 is an integer with 32 bits
Int64 is an integer with 64 bits
UInt8 is an unsigned integer with 8 bits
UInt16 is an unsigned integer with 16 bits
UInt32 is an unsigned integer with 32 bits
UInt64 is an unsigned integer with 64 bits
UInt is like
Int, but unsigned, and it ranges from 0 to
Int.max * 2.
Float is a decimal number with 32 bits.
Then using Cocoa APIs you might use other numeric types like CLong, CGFloat, and more.
You will always use
Double in your code, and use those specific types to particular cases.
Any of those types can always be converted to
Double types, instantiating a number passing the value inside parentheses to
let age : UInt8 = 3 let intAge = Int(age)
You can also convert a number from
let age = Double(3) let count = Int(3.14)
I wrote an entire book on this topic 👇