- -stipple
- This option indicates that the background of the calculator should be drawn using a stipple of the foreground and background colours. On monochrome displays improves the appearance.
- -rpn
- This option indicates that Reverse Polish Notation should be used. In this mode the calculator will look and behave like an HP-10C. Without this flag, it will emulate a TI-30.

*Calculator* Key Usage (TI mode): The numbered keys, the +/- key, and the +, -, *, /,
and = keys all do exactly what you would expect them to. It should be
noted that the operators obey the standard rules of precedence. Thus, entering
"3+4*5=" results in "23", not "35". The parentheses can be used to override
this. For example, "(1+2+3)*(4+5+6)=" results in "6*15=90".

The entire number in the calculator display can be selected, in order to paste the result of a calculation into text.

The action procedures associated with each function are given below. These are useful if you are interested in
defining a custom calculator. The action used for all digit keys is **digit( n**),
where

- 1/x
- Replaces the number in the display with its reciprocal. The corresponding action procedure is
**reciprocal()**. - x^2
- Squares the number in the display. The corresponding action procedure is
**square()**. - SQRT
- Takes the square root of the number in the display. The corresponding action procedure is
**squareRoot()**. - CE/C
- When pressed once, clears the number in the display without clearing the state of the machine.
Allows you to re-enter a number if you make a mistake. Pressing it twice
clears the state, also. The corresponding action procedure for TI mode is
**clear()**. - AC
- Clears the display, the state, and the memory. Pressing it with
the third pointer button turns off the calculator, in that it exits the
program. The action procedure to clear the state is
**off()**; to quit,**quit()**. - INV
- Invert function. See the individual function keys for details. The corresponding action procedure is
**inverse()**. - sin
- Computes the sine of the number in the display, as interpreted by the current DRG mode (see DRG, below). If inverted,
it computes the arcsine. The corresponding action procedure is
**sine()**. - cos
- Computes the cosine, or arccosine when inverted. The corresponding action procedure is
**cosine()**. - tan
- Computes the tangent, or arctangent when inverted. The corresponding action procedure is
**tangent()**. - DRG
- Changes the DRG mode, as indicated by ’DEG’, ’RAD’, or ’GRAD’ at the bottom of of the calculator ‘‘liquid
crystal’’ display. When in ’DEG’ mode, numbers in the display are taken as being
degrees. In ’RAD’ mode, numbers are in radians, and in ’GRAD’ mode, numbers
are in grads. When inverted, the DRG key has a feature of converting degrees
to radians to grads and vice-versa. Example: put the calculator into ’DEG’
mode, and enter "45 INV DRG". The display should now show something along
the lines of ".785398", which is 45 degrees converted to radians. The corresponding
action procedure is
**degree()**. - e
- The constant ’e’. (2.7182818...). The corresponding action procedure is
**e()**. - EE
- Used for entering exponential numbers. For example, to get "-2.3E-4" you’d enter "2 . 3 +/- EE 4 +/-". The corresponding action procedure is
**scientific()**. - log
- Calculates the log (base 10) of the number in the display.
When inverted, it raises "10.0" to the number in the display. For example,
entering "3 INV log" should result in "1000". The corresponding action procedure
is
**logarithm()**. - ln
- Calculates the log (base e) of the number in the display.
When inverted, it raises "e" to the number in the display. For example,
entering "e ln" should result in "1". The corresponding action procedure
is
**naturalLog()**. - y^x
- Raises the number on the left to the power of the number
on the right. For example "2 y^x 3 =" results in "8", which is 2^3. For
a further example, "(1+2+3) y^x (1+2) =" equals "6 y^x 3" which equals "216".
The corresponding action procedure is
**power()**. - PI
- The constant ’pi’. (3.1415927....) The corresponding action procedure is
**pi()**. - x!
- Computes the factorial of the number in the display. The number in the display must be an integer
in the range 0-500, though, depending on your math library, it might overflow
long before that. The corresponding action procedure is
**factorial()**. - (
- Left parenthesis. The corresponding action procedure for TI calculators is
**leftParen()**. - )
- Right parenthesis. The corresponding action procedure for TI calculators is
**rightParen()**. - /
- Division. The corresponding action procedure is
**divide()**. - *
- Multiplication. The corresponding action procedure is
**multiply()**. - -
- Subtraction. The corresponding action procedure is
**subtract()**. - +
- Addition. The corresponding action procedure is
**add()**. - =
- Perform calculation. The TI-specific action procedure is
**equal()**. - STO
- Copies the number in the display to the memory location. The corresponding action procedure is
**store()**. - RCL
- Copies the number from the memory location to the display. The corresponding action procedure is
**recall()**. - SUM
- Adds the number in the display to the number in the memory location. The corresponding action procedure is
**sum()**. - EXC
- Swaps the number in the display with the number in the memory location. The corresponding
action procedure for the TI calculator is
**exchange()**. - +/-
- Negate; change sign. The corresponding action procedure is
**negate()**. - .
- Decimal point. The action procedure is
**decimal()**.

*Calculator* Key Usage (RPN mode): The number
keys, CHS (change sign), +, -, *, /, and ENTR keys all do exactly what
you would expect them to do. Many of the remaining keys are the same as
in TI mode. The differences are detailed below. The action procedure for
the ENTR key is **enter()**.

- <-
- This is a backspace key that can be used if you
make a mistake while entering a number. It will erase digits from the display.
(See BUGS). Inverse backspace will clear the X register. The corresponding
action procedure is
**back()**. - ON
- Clears the display, the state, and the memory.
Pressing it with the third pointer button turns off the calculator, in
that it exits the program. To clear state, the action procedure is
**off**; to quit,**quit()**. - INV
- Inverts the meaning of the function keys. This would
be the
*f*key on an HP calculator, but*xcalc*does not display multiple legends on each key. See the individual function keys for details. - 10^x
- Raises "10.0" to the number in the top of the stack. When inverted, it calculates
the log (base 10) of the number in the display. The corresponding action
procedure is
**tenpower()**. - e^x
- Raises "e" to the number in the top of the stack.
When inverted, it calculates the log (base e) of the number in the display.
The action procedure is
**epower()**. - STO
- Copies the number in the top of the stack to a memory location. There are 10 memory locations. The desired memory is specified by following this key with a digit key.
- RCL
- Pushes the number from the specified memory location onto the stack.
- SUM
- Adds the number on top of the stack to the number in the specified memory location.
- x:y
- Exchanges the numbers in the top two stack positions, the X and Y registers.
The corresponding action procedure is
**XexchangeY()**. - R v
- Rolls the stack downward. When inverted, it rolls the stack upward. The corresponding action
procedure is
**roll()**. *blank*- These keys were used for programming functions on the HP-10C. Their functionality has not been duplicated in
*xcalc*.

Finally, there are two additional action procedures: **bell()**, which rings the bell;
and **selection()**, which performs a cut on the entire number in the calculator’s
‘‘liquid crystal’’ display.

TI Key | HP Key | Keyboard Accelerator | TI Function | HP Function |

SQRT | SQRT | r | squareRoot( ) | squareRoot( ) |

AC | ON | space | clear( ) | clear( ) |

AC | <- | Delete | clear( ) | back( ) |

AC | <- | Backspace | clear( ) | back( ) |

AC | <- | Control-H | clear( ) | back( ) |

AC | Clear | clear( ) | ||

AC | ON | q | quit( ) | quit( ) |

AC | ON | Control-C | quit( ) | quit( ) |

INV | i | i | inverse( ) | inverse( ) |

sin | s | s | sine( ) | sine( ) |

cos | c | c | cosine( ) | cosine( ) |

tan | t | t | tangent( ) | tangent( ) |

DRG | DRG | d | degree( ) | degree( ) |

e | e | e( ) | ||

ln | ln | l | naturalLog( ) | naturalLog( ) |

y^x | y^x | ^ | power( ) | power( ) |

PI | PI | p | pi( ) | pi( ) |

x! | x! | ! | factorial( ) | factorial( ) |

( | ( | leftParen( ) | ||

) | ) | rightParen( ) | ||

/ | / | / | divide( ) | divide( ) |

* | * | * | multiply( ) | multiply( ) |

- | - | - | subtract( ) | subtract( ) |

+ | + | + | add( ) | add( ) |

= | = | equal( ) | ||

0..9 | 0..9 | 0..9 | digit( ) | digit( ) |

. | . | . | decimal( ) | decimal( ) |

+ /- | CHS | n | negate( ) | negate( ) |

x:y | x | XexchangeY( ) | ||

ENTR | Return | enter( ) | ||

ENTR | Linefeed | enter( ) |

*xcalc* has an enormous application defaults file which specifies the position, label, and function
of each key on the calculator. It also gives translations to serve as keyboard
accelerators. Because these resources are not specified in the source code,
you can create a customized calculator by writing a private application
defaults file, using the Athena Command and Form widget resources to specify
the size and position of buttons, the label for each button, and the function
of each button.

The foreground and background colours of each calculator key can be individually specified. For the TI calculator, a classical colour resource specification might be:

XCalc.ti.Command.background: gray50 XCalc.ti.Command.foreground: white For each of buttons 20, 25, 30, 35, and 40, specify: XCalc.ti.button20.background: black XCalc.ti.button20.foreground: white For each of buttons 22, 23, 24, 27, 28, 29, 32, 33, 34, 37, 38, and 39: XCalc.ti.button22.background: white XCalc.ti.button22.foreground: black

XCalc xcalc Form ti or hp (the name depends on the mode) Form bevel Form screen Label M Toggle LCD Label INV Label DEG Label RAD Label GRAD Label P Command button1 Command button2 Command button3 and so on, ... Command button38 Command button39 Command button40

- rpn (Class Rpn)
- Specifies that the rpn mode should be used. The default is TI mode.
- stipple (Class Stipple)
- Indicates that the background should be stippled. The default is ‘‘on’’ for monochrome displays, and ‘‘off’’ for colour displays.
- cursor (Class Cursor)
- The name of the symbol used to represent the pointer. The default is ‘‘hand2’’.

*customization: -color

This will cause xcalc to pick up the colours in the app-defaults colour customization file: app-defaults/XCalc-color.

Mark Rosenstein, MIT Project Athena

Donna Converse, MIT X Consortium

- Name
- Synopsis
- Description
- Options
- Operation
- Accelerators
- Customization
- Widget hierarchy
- Application resources
- Colours
- Bugs
- Copyright
- Authors

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