Hello, could you help me. Why my default is not working?

Question

let a=+prompt('first number')
let n=+prompt('second number')
function calc(a,n,u) {
switch (u) {
case '-':
return a-n;
break;
case '+':
return a+n;
break;
case '/':
return a/n;
break;
case '*':
return a*n;
break;
default:
return('введите действительный номер');

}
}
console.log(calc(a,n,'-'))
console.log(calc(a,n,'+'))
console.log(calc(a,n,'/'))
console.log(calc(a,n,'*'))

Answer 1

You are not calling the default.
+ - * / are all valid values, so the default not reached

Add something like

Console.log(calc(a,n,z))

Now the default will be called because no matching case.

please add the language you use in the tags

Answer 2

still not working

Answer 3

Please elaborate more. What is it that is not working.

https://code.sololearn.com/WRqrNq7MVuBA/?ref=app

It works in this code.