static void Main(string[] args) { Parser parser = new Parser(); string testExpr = String.Empty; while (true) { Console.Write("> "); testExpr = Console.ReadLine(); if (exitCommand(testExpr)) { break; } else if (clearCommand(testExpr)) { Console.Clear(); continue; } else { parser.tokenizeExpression(testExpr); ArrayList postfixTest = parser.InputToPostfix(); Console.WriteLine("= " + parser.evaluatePostfix(postfixTest)); } } }