//Part 2: Complete this method to evaluate Postfix Expressions using MyListStack static int EvaluatePostFix(string[] stringItems, MyListStack stack) { // Cycle through string array for various operations for (int i = 0; i < stringItems.Length; i++) { int temp; bool isNumeric = int.TryParse(stringItems[i], out temp); if (isNumeric) // if index is a number { stack.Push(temp); } else // if index is an operation { int first = stack.Pop(); int second = stack.Pop(); int total = 0; // Switch for mathematic operations switch (stringItems[i]) { case "+": total = first + second; Console.Write("(" + first + " + " + second + ")\n"); stack.Push(total); break; case "-": total = first - second; Console.Write("(" + first + " - " + second + ")\n"); stack.Push(total); break; case "*": total = first * second; Console.Write("(" + first + " * " + second + ")\n"); stack.Push(total); break; case "/": total = first / second; Console.Write("(" + first + " / " + second + ")\n"); stack.Push(total); break; case "%": total = first % second; Console.Write("(" + first + " % " + second + ")\n"); stack.Push(total); break; } // switch } // else } // for return(stack.Pop()); }