Año bisiesto
JavaScript
var yearGiven = prompt("Write a year number");
function leapYear(year){
if((year%4==0) && ((year%100!= 0) || (year%400==0))){
document.write(year + " is a leap year.");
}else{
document.write(year + " is NOT a leap year.");
}
};
leapYear(yearGiven);