GNOME Calculator Manual
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# Using `GNOME Calculator`

`GNOME Calculator` can be used to perform any of the calculations that you would normally use a scientific calculator or slide-rule for, or to replace the trigonometric and logarithmic tables generally found in the appendix of science textbooks. It is intended as a GNOME replacement for `xcalc`.

## Basic usage

Starting `GNOME Calculator` opens the Main window, shown in .

Figure 1. `GNOME Calculator` Main Window

To perform calculations, type in the numbers using the number keys on your keyboard, or use the 0 through 9 buttons on the main window, and the operator buttons surrounding them.

## Menus

The menu bar, located at the top of the Main Window, contains the following menus:

File

  + + + + + + + + + + + + + + + + ->Quit+ + + + + + + + ( Ctl-Q ) which exits from `GNOME Calculator`.

Edit

  + + + + + + + + + + + + + + + + + + ->Edit+ + + + + + + + + ( Ctl-C ) which copies the current display.

Help

  About shows basic information about `GNOME Calculator`, such as the author's name and the application version number.

## Buttons

The buttons, located on the Main Window, are as follows:

1/x

  Inverts the current display.

  Example 1. 1/x

  When `10` is displayed, pressing 1/x will cause `GNOME Calculator` to display `0.1`.

x^2

  Raises the current display to the second power.

  Example 2. x^2

  When `5` is displayed, pressing x^2 will cause `GNOME Calculator` to display `25`.

SQRT

  Calculates the square root.

  Example 3. SQRT

  When `81` is displayed, pressing SQRT will cause `GNOME Calculator` to display `9`.

CE/C

  This button clears the display.

AC

  This button clears the display and all queued commands.

INV

  The INV is used to invert some operations in `GNOME Calculator`.

  Example 4. INV

  The INV can be used to compute the arcsine of a number. If the display shows `1`, pressing INV, followed by sin, yields a result of `90`, assuming that the units display is set on `DEG`.

sin

  Computes the trigonometric sine. The units used are displayed on the second button down on the right column of buttons.

  Example 5. sin

  When the display shows `90` and the units display shows `DEG` pressing sin will cause `GNOME Calculator` to display `1`.

cos

  Computes the trigonometric cosine, or compliment's sine. The units used are displayed on the second button down on the right column of buttons.

  Example 6. cos

  When the display shows `60` and the units display shows `DEG`, pressing

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