What are the basic data types of swift
Today, I will talk to you about the basic data types of swift, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following for you. I hope you can get something according to this article.
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-- swift basic data type
OC:
Integer int intValue = 10
Floating point double doubleValue = 10.10; float floatValue = 5.1
Long long
Short short
Signed signed
Unsigned unsigned
The value range of various types of data varies under the compiler of different bits.
Swift: pay attention to keyword capitalization
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/ / 1 you can view the type of an identifier through: option + left mouse button
/ / 2 swift has a type inference attribute
/ / Integer
Var intValue:Int = 10
/ / floating point type
Var intValue1:Double = 10.10 / / represents a 64-bit floating point number
Var intValue2:Float = 9.9 / / represents a 32-bit floating point number
/ / if divided by length, the length in Swift is more accurate than that in OC.
Var intValue3:Int8 = 6
Var intValue4:Int16 = 7
Var intValue5:Int32 = 8
Var intValue6:Int64 = 9
/ / signed and unsigned. Default is symbolic (UInt8/UInt16/UInt32/UInt64)
Var uintValue7:UInt = 10
/ / Note: unsigned numbers have a larger range of values than signed ones, because symbolic bits are also used to store values.
/ / Swift is a type-safe language. If you make a value error, it will report an error directly, but OC will not.
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The value is not correct
OC:unsigned int intValue =-10; will not report an error
Swift:var intValue:UInt =-10 will report an error
Overflow:
OC:int intValue = INT_MAX + 1; will not report an error
Swift:var intValue:UInt = UInt.max + 1 will report an error
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Mutual assignment of data types (implicit type conversion)
OC can
Int intValue = 10
Double doubleValue = intValue
Swift: no
Var intValue:Int = 10
Var doubleValue:Double = intValue
The above statement will report an error when "values are never implicitly converted to other types" in Swift (implicit type conversions can be done in OC).
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