Pseudocode for how the Qdoba Rewards Program works

gistfile1.java

// Sometimes I get bored and write Psuedocode for how random things work
// The following is pseudocode for how the Qdoba Rewards Program works

// How much money customer owes
amountDue = 0;

// Customers with Qdoba Cards earn points
if (customer.hasCard()) {
  totalPoints = customer.pointTotal;
}

// On Tuesdays you get double points
pointMultiplier = getDayOfWeek() == "Tuesday" ? 2 : 1;

// Use a stack to temporarily store the entrees
entrees = new Stack();

// Loop through each menu item that is being purchased
for (item in items) {
  if (customer.hasCard() && item.isEntree()) {
    // Each entree earns you 100 points (200 on Tues)
    totalPoints += 100 * pointMultiplier;

    // Push the entree onto the stack
    entrees.push(item);
  }

  // The price of each item adds to the total
  amountDue += item.price;
}

if (customer.hasCard()) {
  // Keep giving free entree until we're either out of points
  // or out of entrees being purchased
  while (totalPoints >= 1100 && !entrees.isEmpty()) {
    item = entrees.pop();

    // Subtract the price of the item from the total
    amountDue -= item.price;

    // Subtract the amount of points used towards free entree
    totalPoints -= 1100;
  }

  // Save the new point of the customer
  customer.pointTotal = totalPoints;
}

// Add the sales tax to the total
amountDue += amountDue * getTaxAsDecimal;