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-.\" Copyright (c) 1994  X Consortium
-.\" 
-.\" Permission is hereby granted, free of charge, to any person obtaining
-.\" a copy of this software and associated documentation files (the
-.\" "Software"), to deal in the Software without restriction, including
-.\" without limitation the rights to use, copy, modify, merge, publish,
-.\" distribute, sublicense, and/or sell copies of the Software, and to
-.\" permit persons to whom the Software is furnished to do so, subject to
-.\" the following conditions:
-.\" 
-.\" The above copyright notice and this permission notice shall be included
-.\" in all copies or substantial portions of the Software.
-.\" 
-.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
-.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-.\" OTHER DEALINGS IN THE SOFTWARE.
-.\" 
-.\" Except as contained in this notice, the name of the X Consortium shall
-.\" not be used in advertising or otherwise to promote the sale, use or
-.\" other dealings in this Software without prior written authorization
-.\" from the X Consortium.
-.\"
-.\"
-.de EX		\"Begin example
-.ne 5
-.if n .sp 1
-.if t .sp .5
-.nf
-.in +.5i
-..
-.de EE
-.fi
-.in -.5i
-.if n .sp 1
-.if t .sp .5
-..
-.TH XCALC 1 __xorgversion__
-.SH NAME
-xcalc \- scientific calculator for X
-.SH SYNOPSIS
-.B xcalc
-[-stipple] [-rpn] [-\fItoolkitoption...\fP]
-.SH DESCRIPTION
-.I xcalc
-is a scientific calculator desktop accessory that can emulate a TI-30
-or an HP-10C.
-.SH OPTIONS
-.PP
-\fIxcalc\fP accepts all of the standard toolkit command line options along
-with two additional options:
-.PP
-.TP 8
-.B \-stipple
-This option indicates that the background of the calculator should be 
-drawn using a stipple of the foreground and background colors.  On monochrome
-displays improves the appearance.
-.PP
-.TP 8
-.B \-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.
-.SH OPERATION
-.PP
-.I Pointer Usage:
-Operations may be performed with pointer button 1, or in some cases,
-with the keyboard.  
-Many common calculator operations have keyboard accelerators.
-To quit, press pointer button 3 on the AC key of the TI calculator, 
-or the ON key of the HP calculator.
-.PP
-.I 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".  
-.PP
-The entire number in the calculator display can be selected, in order to
-paste the result of a calculation into text.
-.PP
-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 \fBdigit(\fIn\fP)\fR, where \fIn\fR
-is the corresponding digit, 0..9.
-.TP 10
-.B 1/x
-Replaces the number in the display with its reciprocal.
-The corresponding action procedure is \fBreciprocal()\fR.
-.TP 10
-.B x^2
-Squares the number in the display.
-The corresponding action procedure is \fBsquare()\fR.
-.TP 10
-.B SQRT
-Takes the square root of the number in the display.
-The corresponding action procedure is \fBsquareRoot()\fR.
-.TP 10
-.B 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 \fBclear()\fR.
-.TP 10
-.B 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 \fBoff()\fR; to quit, \fBquit()\fR.
-.TP 10
-.B INV
-Invert function.  See the individual function keys for details.
-The corresponding action procedure is \fBinverse()\fR.
-.TP 10
-.B 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 \fBsine()\fR.
-.TP 10
-.B cos
-Computes the cosine, or arccosine when inverted.
-The corresponding action procedure is \fBcosine()\fP.
-.TP 10
-.B tan
-Computes the tangent, or arctangent when inverted.
-The corresponding action procedure is \fBtangent()\fP.
-.TP 10
-.B 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 \fBdegree()\fP.
-.TP 10
-.B e
-The constant 'e'.  (2.7182818...).
-The corresponding action procedure is \fBe()\fR.
-.TP 10
-.B 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 \fBscientific()\fR.
-.TP 10
-.B 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 \fBlogarithm()\fP.
-.TP 10
-.B 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 \fBnaturalLog()\fR.
-.TP 10
-.B 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 \fBpower()\fR.
-.TP 10
-.B PI
-The constant 'pi'.  (3.1415927....)
-The corresponding action procedure is \fBpi()\fR.
-.TP 10
-.B 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 \fBfactorial()\fR.
-.TP 10
-.B (
-Left parenthesis.  The corresponding action procedure for TI calculators
-is \fBleftParen()\fR.
-.TP 10
-.B )
-Right parenthesis.  The corresponding action procedure for TI calculators
-is \fBrightParen()\fR.
-.TP 10
-.B /
-Division.  The corresponding action procedure is \fBdivide()\fR.
-.TP 10
-.B *
-Multiplication.  The corresponding action procedure is \fBmultiply()\fR.
-.TP 10
-.B -
-Subtraction.  The corresponding action procedure is \fBsubtract()\fR.
-.TP 10
-.B +
-Addition.  The corresponding action procedure is \fBadd()\fR.
-.TP 10
-.B =
-Perform calculation.  The TI-specific action procedure is \fBequal()\fR.
-.TP 10
-.B STO
-Copies the number in the display to the memory location.
-The corresponding action procedure is \fBstore()\fR.
-.TP 10
-.B RCL
-Copies the number from the memory location to the display.
-The corresponding action procedure is \fBrecall()\fR.
-.TP 10
-.B SUM
-Adds the number in the display to the number in the memory location.
-The corresponding action procedure is \fBsum()\fR.
-.TP 10
-.B EXC
-Swaps the number in the display with the number in the memory location.
-The corresponding action procedure for the TI calculator is \fBexchange()\fR.
-.TP 10
-.B +/-
-Negate; change sign.  The corresponding action procedure is \fBnegate()\fR.
-.TP 10
-.B .
-Decimal point.  The action procedure is \fBdecimal()\fP.
-.sp
-.PP
-.I 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 \fBenter()\fR.
-.sp
-.TP 10
-.B <-
-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 \fBback()\fR.
-.TP 10
-.B 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 \fBoff\fR; to quit, \fBquit()\fR.
-.TP 10
-.B INV
-Inverts the meaning of the function keys.  This would be the  \fIf\fR key
-on an HP calculator, but \fIxcalc\fR does not display
-multiple legends on each key.  See the individual function keys for details.
-.TP 10
-.B 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 \fBtenpower()\fR.
-.TP 10
-.B 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 \fBepower()\fR.
-.TP 10
-.B 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.
-.TP 10
-.B RCL
-Pushes the number from the specified memory location onto the stack.
-.TP 10
-.B SUM
-Adds the number on top of the stack to the number in the specified
-memory location.
-.TP 10
-.B x:y
-Exchanges the numbers in the top two stack positions, the X and Y registers.
-The corresponding action procedure is \fBXexchangeY()\fR.
-.TP 10
-.B R v
-Rolls the stack downward.  When inverted, it rolls the stack upward.
-The corresponding action procedure is \fBroll()\fR.
-.TP 10
-.I blank
-These keys were used for programming functions on the HP-10C.  Their
-functionality has not been duplicated in \fIxcalc\fR.
-.PP
-Finally, there are two additional action procedures:
-\fBbell()\fR, which rings the bell; 
-and \fBselection()\fR, which performs a cut on the
-entire number in the calculator's ``liquid crystal'' display.
-.SH ACCELERATORS
-.PP
-Accelerators are shortcuts for entering commands.  \fIxcalc\fP provides
-some sample keyboard accelerators; also users can customize accelerators.
-The numeric keypad accelerators provided by \fIxcalc\fP
-should be intuitively correct.
-The accelerators defined by \fIxcalc\fP on the main keyboard are given below:
-.PP
-.nf
-.ta .5i 1.0i 1.5i 2.0i 2.5i 3.0i 3.5i 4.0i 4.5i 5.0i 5.5i 6.0i 6.5i 7.0i
-	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()
-.fi
-.PP
-.SH CUSTOMIZATION
-The application class name is XCalc.
-.PP
-\fIxcalc\fP 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.
-.PP
-The foreground and background colors of each calculator key can be 
-individually specified.
-For the TI calculator, a classical color resource specification might be:
-.sp
-.br
-XCalc.ti.Command.background:	gray50
-.br
-XCalc.ti.Command.foreground:	white
-.sp
-For each of buttons 20, 25, 30, 35, and 40, specify:
-.br
-XCalc.ti.button20.background:	black
-.br
-XCalc.ti.button20.foreground:	white
-.sp
-For each of buttons 22, 23, 24, 27, 28, 29, 32, 33, 34, 37, 38, and 39:
-.br
-XCalc.ti.button22.background:	white
-.br
-XCalc.ti.button22.foreground:	black
-.SH WIDGET HIERARCHY
-In order to specify resources, it is useful to know the hierarchy of
-the widgets which compose \fIxcalc\fR.  In the notation below,
-indentation indicates hierarchical structure.  The widget class name
-is given first, followed by the widget instance name.
-.nf
-.ta .5i 1.0i 1.5i 2.0i 2.5i 3.0i 3.5i 4.0i 4.5i 5.0i 5.5i 6.0i 6.5i 7.0i
-.sp
-XCalc xcalc
-	Form  ti  \fIor\fR  hp    \fI(the name depends on the mode)\fR
-		Form  bevel
-			Form  screen
-				Label  M
-				Toggle  LCD
-				Label  INV
-				Label  DEG
-				Label  RAD
-				Label  GRAD
-				Label  P
-		Command  button1
-		Command  button2
-		Command  button3
-\fIand so on, ...\fR
-		Command  button38
-		Command  button39
-		Command  button40
-.fi
-.SH APPLICATION RESOURCES
-.PP
-.TP 8
-\fBrpn\fR (Class \fBRpn\fR)
-Specifies that the rpn mode should be used.  The default is TI mode.
-.TP 8
-\fBstipple\fR (Class \fBStipple\fR)
-Indicates that the background should be stippled.  The default is ``on''
-for monochrome displays, and ``off'' for color displays.
-.TP 8
-\fBcursor\fR (Class \fBCursor\fR)
-The name of the symbol used to represent the pointer.
-The default is ``hand2''.
-.fi
-.SH COLORS
-If you would like xcalc to use its ti colors, include the following 
-in the #ifdef COLOR section of the file you read with xrdb:
-.sp 1
-*customization:                 -color
-.sp 1
-.br
-This will cause xcalc to pick up the colors in the app-defaults color
-customization file:
-.IR __apploaddir__/XCalc-color .
-.fi
-.SH "SEE ALSO"
-X(__miscmansuffix__), xrdb(1), the Athena Widget Set
-.SH BUGS
-.PP
-HP mode is not completely debugged.  In particular, the stack is
-not handled properly after errors.
-.SH COPYRIGHT
-Copyright 1994 X Consortium
-.br
-See \fIX(__miscmansuffix__)\fP for a full statement of rights and permissions.
-.SH AUTHORS
-John Bradley, University of Pennsylvania
-.br
-Mark Rosenstein, MIT Project Athena
-.br 
-Donna Converse, MIT X Consortium