## Postfix Calculator

This calculator uses postfix notation. To use the calculator your
browser requires JavaScript support.
The calculator works a little differently from other 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.