PLCalc

The PLCalc application was designed to be a powerful scientific / financial calculator.
The PLCalc calculator uses RPN (Reverse Polish Notation), an architecture made famous by Hewlett-Packard (there is no connection between PLCalc and HP). RPN has many advantages over algebraic calculators, but there is a learning curve for the uninitiated.
To multiply 7 by 9 in an algebraic calculator, one might proceed thus:
Press 7
Press *
Press 9
Press =
In RPN, the same operation looks like this:
Press 7
Press Enter
Press 9
Press *
The above example is meant only to show the procedure, not the advantage RPN has over algebraic calculators. For that, we turn to a more complex problem. In this example, we need to divide the result of two additions:
y = (a + b) / (c + d)
In this example, the operations are performed in a counterintuitive order, which would require quite a lot of manipulation in an algebraic calculator. But using RPN, its easy:
Enter a
Enter b
Enter +
Enter c
Enter d
Enter +
Enter /
You may have noticed that in RPN, mathematical operators always follow the numbers. Another name for RPN is "postfix," meaning the operators always follow the values to be operated on.System requirementsJava runtime engine