Go In language Iota How to use keywords

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One 、 Review constants

mention Iota This keyword , You have to review Go Constant of language .

1.Go Language constants are generally used const Statement

2.Go Language constants can only be Boolean 、 Digital （ Integer type 、 Floating point and complex Numbers ） And string

3.Go A constant of a language may not specify a type , By the compiler itself , Like the one below 【string】 It's something you can't write （ Also known as Implicit type definition ）

const s string = "constant"

4. Constants cannot be changed while the program is running

Two 、Iota Usage of

Through a specific example , Look at iota Characteristics of . Example: what is the value of each constant in the output of the following code ？

package IotaDemoimport (    "fmt")const(    a = iota    b    c)const(    m=1<<iota    n=2<<iota    x=10    y = iota    z=iota>>1    o)func IotaTest() {    fmt.Println("a=",a)    fmt.Println("b=",b)    fmt.Println("c=",c)    fmt.Println("m=",m)    fmt.Println("n=",n)    fmt.Println("x=",x)    fmt.Println("y=",y)    fmt.Println("z=",z)    fmt.Println("o=",o)}

give the result as follows ：

a= 0
b= 1
c= 2
m= 1
n= 4
x= 10
y= 3
z= 2
o= 2

The above results show that iota Characteristics of , as follows ：

• iota Can only be used in const Limited , Counter equivalent to a constant

• iota Equivalent to an enumeration value , The default from the 0 Start , In a const in , Will be carried out in +1, for example a、b、c You can see it

• iota Not because const Fixed value assigned to , No more ,const Every constant in +1, for example x and y ,y Not because x To be an assignment 10, Namely 2, It is 3

• Enter a new one at a time const,iota It will start again

Add knowledge points of shift operation ：

about Go Linguistic <<（ Move right ） and >>（ Move left ） operation , The key points are ：

• 1. First convert the shifted value to 2 Base number , Moving to the right is the high complement 0, Shift left is the low fill 0

• 2. To the right of the operator is the number of digits to be moved , On the left is the value to be moved ,

  for example 1<<3 Is to put 1 Move to the left 3 position , namely 00000001 Move left 3 position Turn into 00000100 Namely 4

  3<<1 Is to put 3 Move to the left 1 by , namely 00000011 Move left 1 by Turn into 00000110 Namely 6

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