Postfix Notation Calculator

This Chouckulator(tm)-brand calculator uses postfix notation, and works a little differently from calculators you may have used. Suppose you want to add two numbers. Enter the first number. Press "Enter." This commits the first number into the calculator' s memory. Then enter the second number. After that, enter the type of operation (such as "+") that you wish to perform.
This is a sample of JavaScript in action. If you view the source, you'll see that a number of functions, written in JavaScript, are located in the header of this HTML file. These functions are used to perform various math and formatting operations on the client machine.