I cannot solve the problem of the Sound Frequencies course.

Question

That is the task:
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The human ear can hear sounds with frequencies in the range of 20 Hz to 20,000 Hz.
This is called the Audible frequency.
Anything below 20 Hz is called Infrasound, while anything above 20,000 Hz is called Ultrasound.

You need to make a program that takes a sound frequency as input and outputs the corresponding category.

Sample Input:
1800

Sample Output:
Audible
In case thegiven input is negative, your program should output "Wrong Input".
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This is my solution so far:

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package main

import "fmt"

func main() {
var f int
fmt.Scanln(&f)

switch {
case f>20 && f<20000:
fmt.Println("Audible")
case f >20000:
fmt.Println("Ultrasound")
case f <20:
fmt.Println("Infrasound")
case f <0:
fmt.Println("Wrong Input")
}
}
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All test cases are correct except for test case 6
Where is the mistake ?

Answer 1

Rusty

-1 < 20 would be also true
-1 < 0 would be also true

Change your 3rd case.

check description again and apply condition

Answer 2

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

Answer 3

Thanks, didn't know that there was default

Answer 4

package main

import "fmt"

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

}

Answer 5

package main

import "fmt"

func main() {
var frequencies int
fmt.Scanln(&frequencies)
switch {
case frequencies < 0:
fmt.Println("Wrong Input")
case frequencies < 20:
fmt.Println("Infrasound")
case frequencies > 20000:
fmt.Println("Ultrasound")
default:
fmt.Println("Audible")
}

}