Go language switch statement usage

Switch is the most flexible type of control statement, which you need to be aware of when using switch:

--The left curly brace "{" must be in the same row as switch

--Conditional expressions are not limited to constants or integers

--Multiple result options can appear in a single case

--contrary to the rules of C, G0 language does not require a break to explicitly exit a case

--only the Fallthrough keyword is explicitly added in the case to continue with the next case immediately following

--You can not set the conditional expression after switch, in which case the entire switch structure is equivalent to the logical action of multiple If....else

--You can have any number of case statements within a switch, each case followed by a value, and a colon

--the expression used in the switch statement must have a whole or boolean expression, or a type, and the default value is true if the expression does not pass

--constant-expression the case, must be the same data type, in the switch variable, it must be a constant or literal

The--switch statement can have an optional default, which must appear at the end of the switch statement, and default can be used to perform a task when no case is true, and no break statement is required after default

Flow chart

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EGG1:

Package Main

Import "FMT"

Func Main () {

var grade string = "A"

Switch {

Case grade = = "A":

Fmt. Printf ("good....\n")

Case grade = = "B":

Fmt. Printf ("Well done....\n")

Case grade = = "C":

Fmt. Printf ("OK ....")

Default

Fmt. Printf ("INVALID grade....\n")

}

Fmt. Printf ("Your grade is%s\n", grade)

}

EGG2:

Package Main

Import "FMT"

Func Main () {

Switch A: = 1; {

Case a >= 0:

Fmt. Printf ("a>=0")

Case a >= 1:

Fmt. Printf ("A=1")

Default

Fmt. Printf ("Not Found ...")

}

}

# #需要注意的是跟在switch属于局部的变量, Access can only be implemented internally, to global must be outside of the switch

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Go language switch statement usage