## How do I?

### Switch to Reverse Polish Notation

You may wish to switch to using postfix notation, or Reverse Polish Notation. This is a notation where operators come after operands.

To switch over:

- Click on the
*Calculator*dropdown. - Select the
*Postfix*option.

Learn more about postfix on Wikipedia, The Free Encyclopedia

### Switch to Regular Notation (Infix Notation)

The CS2800 Calculator should be set to regular notation by default. If you are returning from Postfix notation, you can easily switch back to Infix.

To switch back:

- Click on the
*Calculator*dropdown. - Select the
*Infix*option.

### Quit the application

When finishing your calculations, you may wish to terminate the application and return back to the operating system.

To exit the application:

- Click on the
*Calculator*dropdown. - Select the
*Quit*option.

Alternatively:

- Press on your operating system's close button

### Get Help

If you are having difficulty using the application, you can view a help site, which opens in your default web browsing application.

To obtain help:

- Click on the
*Help*dropdown. - Select the
*Help*option.

Alternatively:

## Examples

### BIDMAS Compliance

- Calculation:
`1 + 2 * 3 / 4`

- Mode:
`infix`

- Result:
`2.5`

Warning: The order of operations (BIDMAS) applies.

- Brackets
- Divide
- Multiply
- Add
- Subtract
To avoid the problems associated with unintended expressions, consider surrounding ambiguous portions with brackets.