Swift – Integer, Floating-Point Numbers
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
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 |
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:
Type |
N-bit floating-point number |
Number of decimal places |
Double |
64-bit floating-point number |
15 |
Float |
32-bit floating-point number |
6 |
Examples:
6.89, 3.1466, 6778.0, 0.0, 445.99
Last Updated :
17 Jun, 2021
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