Please tell me where am I wrong with this go prog

Question

package main

import "fmt"

func main() {
var f int
fmt.Scanln(&f)
//your code goes here
Switch f {
case f<0:
fmt.Println("Wrong Input")
case f>=0 && f<20:
fmt.Println("Infrasound")
case f>=20 && f<=20000:
fmt.Println("Audible")
default:
fmt.Println("Ultrasound")
}
}

Answer 1

Pratyush Anshuman

That's why because when you write a variable with switch then its mean the type of that variable and the type of each case should be same.

Since you have written f with switch which is a type of int but in each cases the type is boolean (f < 0 returns boolean) so in this case type mismatch so you can't write a variable with switch.

Answer 2

If a variable needs to be compared with something, (==), then the entry is made together with the variable, (switch variable {}), each case statement includes a value for comparison.
If you need to write some condition in the "case", (<, >), then you need to use switch without a variable, since the variable is written in the "case".

👇 👇
switch {
case f<0: 👈
fmt.Println("Wrong Input")
case f>=0 && f<20:
fmt.Println("Infrasound")
case f>=20 && f<=20000:
fmt.Println("Audible")
default:
fmt.Println("Ultrasound")
}

Answer 3

Pratyush Anshuman

There is only "switch" not "switch f"

Answer 4

switch with capital S ("Switch") is not a keyword

Answer 5

Thank you everyone. Sometimes switch is written with the variable and sometimes we use just switch. When should we use switch with variable and when alone

Answer 6

Pratyush Anshuman

When you don't have condition in cases then you have write a variable like this:

switch num {
case 1:
//Statement
case 2:
// Statement
}

In this case you have to write a variable with switch.

Answer 7

Ok I got it. Thank you AJ.

Answer 8

Thanks again. Another thing is how r u able to tag me everytime you answer. I am searching for it but cant find how

Answer 9

Thanks A͢J

Answer 10

Use @ symbol before name. List of names will be open (list of your followers, following and also the name of the person who has given answer) . Now you can select any name.