Chapter 8 - Types of Data

In any programming language, we use different types of variables to store information. Variables are nothing but reserved memory locations to store values.

Int

• Int which short for Integer.
• Integers are round numbers like 3, 30, 300, or -16777216.
• You can use Int32, Int64 to define 32 or 64 bit signed integer.
• On a 32-bit platform, Int is the same size as Int32.
• On a 64-bit platform, Int is the same size as Int64.

UInt

• Swift also provides an unsigned integer type UInt.
• Use UInt only when you specifically need an unsigned integer type.

String

• A string is a series of characters.
• Swift strings are represented by the String type.

Bool

• Swift has a basic Boolean type, called Bool.
• Boolean values are referred to as logical, because they can only ever be true or false.

Float

• This is used to represent a 32-bit floating-point number and numbers with smaller decimal points.

Double

• This is used to represent a 64-bit floating-point number and used when floating-point values must be very large.
• The official Apple recommendation is always to use Double because it has the highest accuracy.
• Double has twice the accuracy of Float so it doesn't need to cut the ​number to fit.