Stack error message

Question

I'm getting a maximum stack error message, this program is supposed to discount 15% off of the original price.
function main() {
var prodID = readLine();
var price = parseInt(readLine(),10);
var discount = parseInt(readLine(),10);

var prod1= new Product(prodID, price);
console.log(prod1.prodID + " price: " + prod1.price);

prod1.changePrice(discount);
console.log(prod1.prodID + " new price: " + prod1.price);
}

function Product(prodID, price) {
this.prodID = prodID;
this.price = price;

this.changePrice = function(discount) {
//your code goes here
var p = price * discount;
var newPrice = price - p;

var t = new Product(price)
t.changePrice(newPrice);

}
}

Answer 1

changePrice() should a setter method for price

In your attempt you try to create a Product object inside the changePrice() method and then call itself on this object?

Just assign the new price to this.price – and mind that discount is given as integer number (not a proportion)!

Answer 2

Thank you, I had to reset the code and divide variable discount by 100 then I was able to subtract the discount.
I thought the discount was going to be fixed at 0.15, 15%.
This way of course is more interesting but this is very complicated for someone who learned a little bit of the Basic programming language back in the early 90's when you had to use the "goto" statement to jump around code.
I think I could have written this program more easily using C++ taking input from the user and just plain functions and "cout" commands to display the result.
I'm gonna have to study this because I have no clue about what you meant about "In your attempt you try to create..........then call itself on this object?

Answer 3

It would be nice if there was a way to look at the flow of this code here from start to finish.

Answer 4

I mean this code here now that it works correctly:

function main() {
var prodID = readLine();
var price = parseInt(readLine(),10);
var discount = parseInt(readLine(),10);

var prod1= new Product(prodID, price);
console.log(prod1.prodID + " price: " + prod1.price);

prod1.changePrice(discount);
console.log(prod1.prodID + " new price: " + prod1.price);
}

function Product(prodID, price) {
this.prodID = prodID;
this.price = price;
this.changePrice = function(discount) {
//your code goes here
discount = discount/100;

var newPrice = price - ( discount * price );

this.price = newPrice;

}
}

Answer 5

I think I understand the flow of this code now.
//this part doesn't make a call
// it only display user input at the
//moment
console.log(prod1.prodID + " price: " + prod1.price);

// this part here makes a function call
// to change to a discounted price
prod1.changePrice(discount);
console.log(prod1.prodID + " new price: " + prod1.price);