Bot program to count the products bought in the supermarket, with total sum.

struct product
{
    var name: String
    var price: Double
    var count: Int
}

var products: [product]

func add(prd: product)
{
    products.append(prd)
}

func totalSum() -> Double {
    var sum: Double = 0
    for i in 0..<products.count
    {
        sum += Double(products[i].count) * products[i].price
    }
    return sum
}