//a
function a(hi){
    alert(hi)
}
a("Привет!") // вызывает alert("Привет!")
//cube
function greet(step){
   var stepin = step**3
   console.log(stepin)
}
greet(prompt("введите число для возвидения в третью степень", "число"))
//avg2
function average (a,b){
  let avg2 = (a+b)/2
  console.log(avg2)
}
average(1,2)
average(5,10)
//sum3
function sumTree (a=0,b=0,c=0){
  let sum3 = a+b+c
  console.log(sum3)
}
sumTree(1,2,3)
sumTree(5,10,100500)
sumTree(5,10)
//greetAll
function userName(a, b, c) {
  arguments[0]=prompt("What u name","Superman");
  alert(`Hellow ${arguments[0]} `);
  arguments[1]=prompt("What u surName","SpiderMan");
  alert(`Hellow ${arguments[0]}, ${arguments[1]}`);
  arguments[2]=prompt("What u fatherName","Captain Obvious");
  alert(`Hellow ${arguments[0]}, ${arguments[1]}, ${arguments[2]}`);
};
userName();
//sum
function sum() {
  var fullSum = 0;
  for (var i = 0; i < arguments.length; i++) {
    fullSum += arguments[i];
  }
  console.log(fullSum)
  return fullSum;
}
sum(1)
sum(2)
sum(10,20,40,100)
//union
var unionCheck = prompt("Введите название задания")
switch (unionCheck.toLowerCase()){
    case "a": a()
              break
    case "cube": greet()
              break
    case "avg2": average()
              break
    case "sum3": sumTree()
              break
    case "greetAll": userName()
              break
    case "sum": sum()
              break
}