Question

explain line by line what it does

Description: This function applies discount percentage on an item

price unless the item price is less than the whole sale

price. For example, a product at $10 with a wholesale price of $5 and a discount

of 10% returns $9.

function applyDiscount(productPrice : Double,

       wholesalePrice : Double,

       discount : Double)

Return Double

Create variable discountedPrice as double

discountedPrice = productPrice * (1–discount)

if (discountedPrice < wholesalePrice)

     discountedPrice = wholesalePrice

end if

return discountedPrice

End function

Answer 1

// function that applies discount on the productPrice by the given discount percent and returns the price after discount
function applyDiscount(productPrice : Double, wholesalePrice : Double, discount : Double)

Return Double // specifying the return type

Create variable discountedPrice as double // creates a variable discountedPrice of double type

// calculates discountedPrice where productPrice is the price of product
// and discount is the discount percent expressed as double (i.e if discount percent is 10 then discount = 0.1)
discountedPrice = productPrice * (1–discount)

// after calculating the discountedPrice check if discountedPrice < wholesalePrice , then set discountedPrice to wholesalePrice else does nothing
if (discountedPrice < wholesalePrice)
   discountedPrice = wholesalePrice
end if

return discountedPrice // returns the discountedPrice

End function // end of function applyDiscount

Eg:  Using the above given example:

productPrice = 10

wholesalePrice = 5

discount = 0.1 (10%)

discountedPrice = productPrice * (1–discount)

= 10(1-0.1)

= 10 * 0.9

= 9

Since discountedPrice > wholesalePrice (9 > 5) , so discountedPrice will be 9 which will be returned , if suppose discount was 0.6 i.e 60%

discountedPrice = productPrice * (1–discount)

= 10(1-0.6)

= 10 * 0.4

= 4

In this case discountedPrice < wholesalePrice (4 < 5) , so discountedPrice = wholesalePrice = 5 and this will be returned