What's wrong with this code ? was trying to make a Program that could detect if it's a leap year or not ...?¿

Question

alert ("Find out if it's leap year")
var year=prompt("Enter the passing year")
switch (year){
case year/4===0:
document.write("Leap year");
default: document.write("Normal");
}

Answer 1

/ return you the quotient of division not remainder.

try% instead of / for your desired result.

Answer 2

please ask Google for leap year rules.