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Go language self-study series | golang switch statement

2022-07-03 15:40:00 【51CTO】

Video source ：B standing 《golang Introduction to project practice [2021 newest Go Language course , There is no nonsense , Dry only ！ Ongoing update ...]》

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go In language switch sentence , It is very easy to judge the situation of multiple values .

go In language switch Sentence syntax 

      
      

       
       switch var1 {
       
       
    case val1:
       
       
        ...
       
       
    case val2:
       
       
        ...
       
       
    default:
       
       
        ...
       
       
}
      
      

      
      
    
       
       
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go In language switch Statement instance

Judge the grade 

      
      

       
       package main
       
       

       
       
import (
       
       
    "fmt"
       
       
)
       
       

       
       
func f() {
       
       
    grade := "A"
       
       
    switch grade {
       
       
    case "A":
       
       
        fmt.Println(" good ")
       
       
    case "B":
       
       
        fmt.Println(" good ")
       
       
    default:
       
       
        fmt.Println(" commonly ")
       
       
    }
       
       
}
       
       

       
       
func main() {
       
       
    f()
       
       
}
      
      

      
      
    
       
       
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Running results 

      
      

       
       [Running] go run "d:\SynologyDrive\ software development \go\golang Introduction to project practice \goproject\360duote.com\pro01\test.go"
       
       
 good 
      
      

      
      
    
       
       
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Multiple condition matching

go Language switch sentence , Multiple conditions can be matched at the same time , Separated by commas , If one of them matches successfully .

      
      

       
       package main
       
       

       
       
import (
       
       
    "fmt"
       
       
)
       
       

       
       
func f() {
       
       
    day := 3
       
       
    switch day {
       
       
    case 1, 2, 3, 4, 5:
       
       
        fmt.Println(" Working day ")
       
       
    case 6, 7:
       
       
        fmt.Println(" Rest Day ")
       
       
    }
       
       
}
       
       

       
       
func main() {
       
       
    f()
       
       
}
      
      

      
      
    
       
       
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Running results 

      
      

       
       [Running] go run "d:\SynologyDrive\ software development \go\golang Introduction to project practice \goproject\360duote.com\pro01\test.go"
       
       
 Working day 
      
      

      
      
    
       
       
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case It can be a conditional expression 

      
      

       
       package main
       
       

       
       
import (
       
       
    "fmt"
       
       
)
       
       

       
       
func f() {
       
       
    score := 90
       
       
    switch {
       
       
    case score >= 90:
       
       
        fmt.Println(" Enjoy the holidays ")
       
       
    case score < 90 && score >= 80:
       
       
        fmt.Println(" Study hard ！")
       
       
    default:
       
       
        fmt.Println(" Study hard ！")
       
       
    }
       
       
}
       
       

       
       
func main() {
       
       
    f()
       
       
}
      
      

      
      
    
       
       
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Running results 

      
      

       
       [Running] go run "d:\SynologyDrive\ software development \go\golang Introduction to project practice \goproject\360duote.com\pro01\test.go"
       
       
 Enjoy the holidays 
      
      

      
      
    
       
       
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fallthrough The next step that meets the conditions can be executed case

      
      

       
       package main
       
       

       
       
import (
       
       
    "fmt"
       
       
)
       
       

       
       
func f3() {
       
       
    a := 100
       
       
    switch a {
       
       
    case 100:
       
       
        fmt.Println("100")
       
       
        fallthrough
       
       
    case 200:
       
       
        fmt.Println("200")
       
       
    case 300:
       
       
        fmt.Println("300")
       
       
    default:
       
       
        fmt.Println("other")
       
       
    }
       
       
}
       
       

       
       
func main() {
       
       
    f3()
       
       
}
      
      

      
      
    
       
       
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Running results 

      
      

       
       [Running] go run "d:\SynologyDrive\ software development \go\golang Introduction to project practice \goproject\360duote.com\pro01\test.go"
       
       
100
       
       
200
      
      

      
      
    
       
       
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go In language switch Notes on sentences

  1. Support multi condition matching
  2. Different case Do not use break Separate , By default, only one... Will be executed case.
  3. If you want to perform multiple case, Need to use fallthrough keyword , Also available break End .
  4. Branches can also use expressions , for example ：a>10
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