Crear una calculadora

function suma(x, y){
  
  return x + y;
}

function multiplica(x, y){
  return x * y;
}

function divide(x, y){
  return x / y;
}

function resta(x, y){
  return x - y;
}

var num1 = parseInt(prompt("Dame un numero"));
var num2 = parseInt(prompt("Dame el segundo numero"));
var operacion = prompt("Que operacion quieres hacer?");

//console.log(suma(num1, num2));

if (operacion == "suma"){
  console.log(suma(num1, num2));
}else if (operacion == "multiplica") {
  console.log(multiplica(num1, num2));
}else if (operacion == "divide") {
  console.log(divide(num1, num2));
}else if (operacion == "resta") {
  console.log