Adds calculation of fee

01-CodeReviewEx/Shop-Ex/Account.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Shop_Ex
+{
+    public class Account
+    {
+        public double principal, rate; int daysActive, accountType;
+        public static const int STANDARD = 0, BUDGET = 1, PREMIUM = 2, PREMIUM_PLUS = 3;
+    }
+}

01-CodeReviewEx/Shop-Ex/Program.cs

@@ -12,9 +12,33 @@ static void Main(string[] args)
         {
 
 
+         Account[] myAccounts = new Account[10];
+            Account a = new Account();
+            a.principal = 1.0;
+            a.rate = 0.5;
+            myAccounts[0] = a;
+            a = new Account() { principal = 1.5, rate = 0.75 };
+
+            double fee = calculateFee(myAccounts);
+            Console.WriteLine(fee);
+
+        }
+
+        public static double calculateFee(Account[] accounts)
+        {
+            double totalFee = 0.0;
+            Account account;
+            for (int i = 0; i < accounts.Length; i++)
+            {
+                account = accounts[i];
+                if (account.accountType == Account.PREMIUM || account.accountType == Account.PREMIUM_PLUS) totalFee += .0125 * ( // 1.25% broker's fee
+              account.principal * Math.pow(account.rate, (account.daysActive / 365.25)) - account.principal); // interest-principal
+            }
+            return totalFee;
         }
 
+
 
 
     }
-}
+}