"Go Learning Notes" 4, constants and operators

This is a creation in Article, where the information may have evolved or changed.

Definition of constants

• The value of the constant is determined at compile time
• Constants are defined in the same format as variables
• The right side of the equal sign must be a constant or constant expression
• A function in a constant expression must be a built-in function

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Const int 1 Const ' A ' Const "123" Len ) Const 1,"2","3"const"234",len)

Initialization rules and enumerations for constants

• When you define a constant group, if you do not provide an initial value, the expression that will use the upstream
• Using the same expression does not mean that you have the same value
• Iota is a constant counter, starting with 0, the group does not define 1 constants automatically incremented by 1
• The effect of enumerations can be achieved by initializing rules with iota
• Without encountering a const keyword, iota resets to 0

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Const "A" Iota //d = = 3) Const Iota //f = = 1) Const Iota Tuesdaywednesday ....)

Operator

Operators in Go are combined from left to right, with precedence (high to low)
^ !
*/% << >> & &^
+ - | ^
= = = < <= >= >
<-
&&
||

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6 : 0110 11 : 1011 -------------& 0010 | 1111 ^ 1101