Swift Integer, FloatingPoint Numbers (original) (raw)

Swift - Integer, Floating-Point Numbers

Last Updated : 17 Jun, 2021

Integers are whole numbers that can be negative, zero, or positive and cannot have a fractional component. In programming, zero and positive integers are termed as “unsigned”, and the negative ones are “signed”. Swift provides these two categories in the form of 8-bit, 16-bit, 32-bit and 64-bit format. The integers in Swift follow a naming convention similar to C, i.e., a signed 16-bit integer is of type “Int16”, and an unsigned 8-bit integer is of type “UInt8”.

Integer Bounds

Int: Swift provides an additional integer type, “Int”, which does not require the user to explicitly mention any of the above integer types unless restrictions are imposed.

UInt: Similarly, Swift also provides “UInt”, which also can be used unless any specific type is required.

Note: Both “Int” and “UInt” are platform native. This means, if the platform where the code is run is a 32-bit platform, then “Int” will be the same as “Int32”, and “UInt” will be the same as “UInt 32”. The same is the case with a 64-bit platform.

Additionally, we can run a program in Swift to find the minimum and maximum values of the integer type using the “min” and “max” functions, the corresponding outputs are as follows:

Illustration:

print("Integer Type Min Max") print("UInt8 (UInt8.min) (UInt8.max)") print("UInt16 (UInt16.min) (UInt16.max)") print("UInt32 (UInt32.min) (UInt32.max)") print("UInt64 (UInt64.min) (UInt64.max)") print("Int8 (Int8.min) (Int8.max)") print("Int16 (Int16.min) (Int16.max)") print("Int32 (Int32.min) (Int32.max)") print("Int64 (Int64.min) (Int64.max)")

Output:

Integer Type Min Max UInt8 0 255 UInt16 0 65535 UInt32 0 4294967295 UInt64 0 18446744073709551615 Int8 -128 127 Int16 -32768 32767 Int32 -2147483648 2147483647 Int64 -9223372036854775808 9223372036854775807

Now dwelling on the next numbers, Floating-Point Numbers are the numbers that can represent a fractional component. These can also represent integers in a decimal form. Swift provides two signed types of these numbers:

Examples:

6.89, 3.1466, 6778.0, 0.0, 445.99