Go Switch

by Online Tutorials Library July 14, 2022

Go switch

The Go switch statement executes one statement from multiple conditions. It is similar to if-else-if chain statement.

Syntax:

The switch statement in Go is more flexible. In the above syntax, var1 is a variable which can be of any type, and val1, val2, … are possible values of var1.

In switch statement, more than one values can be tested in a case, the values are presented in a comma separated list

like: case val1, val2, val3:

If any case is matched, the corresponding case statement is executed. Here, the break keyword is implicit. So automatic fall-through is not the default behavior in Go switch statement.

For fall-through in Go switch statement, use the keyword “fallthrough” at the end of the branch.

Go Switch Example:

  package main  import “fmt”  func main() {     fmt.Print(“Enter Number: “)    var input int    fmt.Scanln(&input)     switch (input) {    case 10:        fmt.Print(“the value is 10”)      case 20:        fmt.Print(“the value is 20”)      case 30:        fmt.Print(“the value is 30”)      case 40:        fmt.Print(“the value is 40″)      default:        fmt.Print(” It is not 10,20,30,40 “)     }  }  

Output:

Enter Number: 20  the value is 20

Output:

Enter Number: 35   It is not 10,20,30,40

Go switch fallthrough example

  import “fmt”  func main() {     k := 30     switch k {     case 10:        fmt.Println(“was <= 10”); fallthrough;     case 20:        fmt.Println(“was <= 20”); fallthrough;     case 30:        fmt.Println(“was <= 30”); fallthrough;     case 40:        fmt.Println(“was <= 40”); fallthrough;     case 50:        fmt.Println(“was <= 50”); fallthrough;     case 60:        fmt.Println(“was <= 60”); fallthrough;     default:        fmt.Println(“default case”)     }  }  

Output:

was <= 30  was <= 40  was <= 50  was <= 60  default case

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