ede/ede-calc/SciCalc.fl

# data file for the Fltk User Interface Designer (fluid)
version 1.0108 
header_name {.h} 
code_name {.cpp}
decl {\#include <stdio.h>} {} 

decl {\#include <stdlib.h>} {selected global
} 

decl {\#include <string.h>} {global
} 

decl {\#include "math.h"} {} 

Function {gammaln(double xx)} {open private return_type double
} {
  code {int j;
double x,y,tmp,ser;
static double cof[6] = {76.18009172947146,
						-86.50532032941677,
						24.01409824083091,
						-1.231739572450155,
						0.1208650973866179e-2,
						-0.5395239384953e-5};
	
	y = x = xx;
	tmp = x + 5.5;
	tmp -= (x+0.5)*log(tmp);
	ser = 1.000000000190015;
	for (j=0;j<6;j++) ser += cof[j]/++y;
	return -tmp+log(2.5066282746310005*ser/x);} {}
} 

Function {truncf(double x)} {private return_type double
} {
  code {if (x < 0.0)
		x = -floor(-x);
	else
		x = floor(x);
	return x;} {}
} 

class SciCalc {open
} {
  decl {enum {MaxNumBrkts=10};} {}
  decl {enum Operator {PLUS,MINUS,MULT,DIV,POW,INVPOW,EVAL};} {}
  decl {enum mode {NONE=0,DOT=-1,NORM=-2,EXP=-3};} {}
  declblock {/* members */} {after {/********/}
  } {
    decl {double value[4*(MaxNumBrkts+1)];    /* The values on the stack */} {}
    decl {int priority[6];   /* the priorities of each operator */} {}
    decl {int oper[3*(MaxNumBrkts+1)];        /* the operators between them */} {}
    decl {int top;                            /* the top of the stack */} {}
    decl {int startbrkt[(MaxNumBrkts+1)];     /* the positions of the left brackets */} {}
    decl {int currentbrkt;                    /* bracketing we are in */} {}
    decl {double mem;             /* The memory value */} {}
    decl {int ready;              /* Whether last number is ready.
                           if "ready" is set, then typing another number
                           overwrites the current number. */} {}
    decl {int dot;                /* Whether the dot has been typed */} {}
    decl {double diver;           /* The divider when behind the dot */} {}
    decl {int behind;             /* Number of digits behind dot */} {}
    decl {int inv;                /* Whether inverse key is depressed */} {}
    decl {int emode;              /* Whether we are entering the exponent */} {}
    decl {int exponent;           /* the exponent value whilst entering exponent */} {}
    decl {double mantissa;        /* the mantissa value whilst entering exponent */} {}
    decl {int base;               /* the base we are working in (2,8,10 or 16) */} {}
    decl {int drgmode;            /* whether we are in deg, rad or grad mode */} {}
  }
  Function {SciCalc()} {open
  } {
    Fl_Window win {
      label ecalc open
      private xywh {528 286 181 262} type Double visible
    } {
      Fl_Box leddisplay {
        label {0 }
        private xywh {5 3 172 24} box DOWN_BOX color 207 labelfont 1 labelsize 16 labelcolor 59 align 24
      }
      Fl_Box box_DEGRAD {
        label { }
        private xywh {24 27 35 15} box ENGRAVED_BOX labelsize 9 align 16
      }
      Fl_Box box_bracket {
        private xywh {59 27 65 15} box ENGRAVED_BOX labelsize 9 align 16
      }
      Fl_Box box_M {
        label M
        private xywh {124 27 35 15} box ENGRAVED_BOX labelsize 9 align 16
      }
      Fl_Group {} {open
        private xywh {46 44 93 22} color 46
      } {
        Fl_Button radio_2 {
          label 2
          callback {change_base(2);}
          private xywh {49 48 20 15} type Radio labelsize 10 labelcolor 1
        }
        Fl_Button radio_8 {
          label 8
          callback {change_base(8);}
          private xywh {70 48 21 15} type Radio labelsize 10 labelcolor 1
        }
        Fl_Button radio_10 {
          label 10
          callback {change_base(10);}
          private xywh {92 48 21 15} type Radio value 1 labelsize 10 labelcolor 1
        }
        Fl_Button radio_16 {
          label 16
          callback {change_base(16);}
          private xywh {114 48 21 15} type Radio labelsize 10 labelcolor 1
        }
      }
      Fl_Group {} {open
        private xywh {3 163 107 94} box FLAT_BOX color 43
      } {
        Fl_Button but_7 {
          label 7
          callback {handle_number(7);}
          private xywh {6 167 32 20} shortcut 0x37 labelfont 1 labelsize 16
        }
        Fl_Button but_8 {
          label 8
          callback {handle_number(8);}
          private xywh {41 167 32 20} shortcut 0x38 labelfont 1 labelsize 16
        }
        Fl_Button but_9 {
          label 9
          callback {handle_number(9);}
          private xywh {75 167 32 20} shortcut 0x39 labelfont 1 labelsize 16
        }
        Fl_Button but_4 {
          label 4
          callback {handle_number(4);}
          private xywh {6 189 32 20} shortcut 0x34 labelfont 1 labelsize 16
        }
        Fl_Button but_5 {
          label 5
          callback {handle_number(5);}
          private xywh {41 189 32 20} shortcut 0x35 labelfont 1 labelsize 16
        }
        Fl_Button but_6 {
          label 6
          callback {handle_number(6);}
          private xywh {75 189 32 20} shortcut 0x36 labelfont 1 labelsize 16
        }
        Fl_Button but_1 {
          label 1
          callback {handle_number(1);}
          private xywh {6 211 32 20} shortcut 0x31 labelfont 1 labelsize 16
        }
        Fl_Button but_2 {
          label 2
          callback {handle_number(2);}
          private xywh {41 211 32 20} shortcut 0x32 labelfont 1 labelsize 16
        }
        Fl_Button but_3 {
          label 3
          callback {handle_number(3);}
          private xywh {75 211 32 20} shortcut 0x33 labelfont 1 labelsize 16
        }
        Fl_Button but_0 {
          label 0
          callback {handle_number(0);}
          private xywh {6 233 32 20} shortcut 0x30 labelfont 1 labelsize 16
        }
        Fl_Button but_dot {
          label {.}
          callback {handle_number(DOT);}
          private xywh {41 233 32 20} shortcut 0x2e labelfont 1 labelsize 16
        }
        Fl_Button but_sign {
          label {+/-}
          callback {if (! emode)
{
	value[top] = -value[top];
	set_display(value[top],NORM);
}
else 
{
	exponent = -exponent;
	value[top] = mantissa*pow(10.0, (double)exponent);
	set_display(mantissa,EXP);
}}
          xywh {75 233 32 20} labelfont 1 labelsize 16
        }
      }
      Fl_Button but_C {
        label C
        callback {init_value(top); 
set_display(0.0,NORM);}
        private xywh {112 167 31 20} labelfont 1 labelsize 16
      }
      Fl_Button but_AC {
        label AC
        callback {init_value(0);
set_display(0.0,NORM);
currentbrkt = 0;
box_bracket->label("");
box_bracket->redraw();}
        private xywh {146 167 30 20} labelfont 1 labelsize 16
      }
      Fl_Button but_X {
        label x
        callback {handle_operator(MULT);}
        private xywh {112 189 31 20} shortcut 0x2a labelfont 1 labelsize 16
      }
      Fl_Button but_div {
        label {/}
        callback {handle_operator(DIV);}
        private xywh {146 189 30 20} shortcut 0x2f labelfont 1 labelsize 16
      }
      Fl_Button but_plus {
        label {+}
        callback {handle_operator(PLUS);}
        private xywh {112 211 31 20} shortcut 0x2b labelfont 1 labelsize 16
      }
      Fl_Button but_minus {
        label {-}
        callback {handle_operator(MINUS);}
        private xywh {146 211 30 20} shortcut 0x2d labelfont 1 labelsize 16
      }
      Fl_Button but_pi {
        label {e/p}
        callback {exponent_pi();}
        private xywh {112 233 31 20} labelfont 12 labelsize 17
      }
      Fl_Button but_eval {
        label {=}
        callback {handle_operator(EVAL);}
        private xywh {146 233 30 20} shortcut 0x3d labelfont 1 labelsize 16
      }
      Fl_Button but_eval_hidden {
        callback {handle_operator(EVAL);}
        private xywh {147 253 6 7} box NO_BOX shortcut 0xff0d labelfont 1 labelsize 16
      }
      Fl_Button but_eval_hidden2 {
        callback {handle_operator(EVAL);}
        private xywh {157 263 6 7} box NO_BOX shortcut 0xff8d labelfont 1 labelsize 16
      }
      Fl_Button but_sqrt {
        label sqrt
        callback {if (base > 10) handle_number(10.0); 
	else
	if (! inv) 
	{
		value[top] = sqrt(value[top]);
		set_display(value[top],NORM);
		ready = 1;
	}
	else
	{
		value[top] = pow(value[top], 2.0);
		set_display(value[top],NORM);
		ready = 1;
	}}
        private xywh {6 70 32 21} labelsize 11 labelcolor 4
      }
      Fl_Button but_pow {
        label {x^y}
        callback {if (base > 10)
		handle_number(11.0);
	else
		handle_operator(check_inv->value()?INVPOW:POW);}
        private xywh {41 70 32 21} labelsize 11 labelcolor 4
      }
      Fl_Button but_sin {
        label sin
        callback {if (base > 10) handle_number(12.0); 
else
	if (! inv) 
	{
		value[top] = sin(to_drg(value[top]));
		set_display(value[top],NORM);
		ready = 1;
	}
	else
	{
		value[top] = from_drg(asin(value[top]));
		set_display(value[top],NORM);
		ready = 1;
	}}
        private xywh {76 70 31 21} labelsize 11 labelcolor 4
      }
      Fl_Button but_cos {
        label cos
        callback {if (base > 10) handle_number(13.0);
else
	if (! inv) 
	{
		value[top] = cos(to_drg(value[top]));
		set_display(value[top],NORM);
		ready = 1;
	}
	else
	{
		value[top] = from_drg(acos(value[top]));
		set_display(value[top],NORM);
		ready = 1;
	}}
        private xywh {110 70 31 21} labelsize 11 labelcolor 4
      }
      Fl_Button but_tan {
        label tan
        callback {if (base > 10) handle_number(14.0);
	else
	if (! inv)
	{
		value[top] = tan(to_drg(value[top]));
		set_display(value[top],NORM);
		ready = 1;
	}
	else
	{
		value[top] = from_drg(atan(value[top]));
		set_display(value[top],NORM);
		ready = 1;
	}}
        private xywh {144 70 30 21} labelsize 11 labelcolor 4
      }
      Fl_Button but_log {
        label log
        callback {if (base > 10) handle_number(15.0);
else
	if (! inv)
	{
		value[top] = log10(value[top]);
		set_display(value[top],NORM);
		ready = 1;
	}
	else
	{
		value[top] = pow(10.0, value[top]);
		set_display(value[top],NORM);
		ready = 1;
	}}
        private xywh {6 93 32 21} labelsize 11 labelcolor 4
      }
      Fl_Button but_ln {
        label ln
        callback {if (! inv)
	{
		value[top] = log(value[top]);
		set_display(value[top],NORM);
		ready = 1;
	}
	else
	{
		value[top] = exp(value[top]);
		set_display(value[top],NORM);
		ready = 1;
	}}
        private xywh {41 93 32 21} labelsize 11 labelcolor 4
      }
      Fl_Button but_int {
        label int
        callback {if (! inv)
	{
		value[top] = truncf(value[top]);
		set_display(value[top],NORM);
		ready = 1;
	}
	else
	{
		value[top] = value[top] - truncf(value[top]);
		set_display(value[top],NORM);
		ready = 1;
	}}
        private xywh {76 93 31 21} labelsize 11 labelcolor 4
      }
      Fl_Button but_dr {
        label {d->r}
        callback {if (! inv) 
	{
		value[top] = M_PI*value[top]/180.0;
		set_display(value[top],NORM);
		ready = 1;
	}
	else
	{
		value[top] = 180.0*value[top]/M_PI;
		set_display(value[top],NORM);
		ready = 1;
	}}
        private xywh {110 93 31 21} labelsize 10 labelcolor 4
      }
      Fl_Button but_drg {
        label {d-r-g}
        callback {drgmode++;
	drgmode %= 3;
	set_drgdisp();}
        private xywh {144 93 30 21} labelsize 9
      }
      Fl_Button but_leftbr {
        label {[}
        callback {add_left_bracket();}
        private xywh {6 116 32 21} shortcut 0x28 labelsize 11
      }
      Fl_Button but_rightbr {
        label {]}
        callback {add_right_bracket();}
        private xywh {41 116 32 21} shortcut 0x29 labelsize 11
      }
      Fl_Button but_exch {
        label exch
        callback {exchange();}
        private xywh {76 116 31 21} labelsize 11
      }
      Fl_Button but_invx {
        label {1/x}
        callback {value[top] = 1.0/value[top];
	set_display(value[top],NORM);
	ready = 1;}
        private xywh {110 116 31 21} labelsize 11
      }
      Fl_Button but_fact {
        label {x!}
        callback {factorial();}
        private xywh {144 116 30 21} labelsize 11
      }
      Fl_Button but_Mplus {
        label {M+}
        callback {if (! inv) mem += value[top]; else mem -= value[top];
	set_display(value[top],NORM);
	ready = 1;
	set_memdisp();}
        private xywh {6 139 32 21} color 93 labelcolor 4
      }
      Fl_Button but_Mmult {
        label {M*}
        callback {if (! inv) mem *= value[top]; else mem /= value[top];
	set_display(value[top],NORM);
	ready = 1;
	set_memdisp();}
        private xywh {41 139 32 21} color 93 labelcolor 4
      }
      Fl_Button but_Mclear {
        label MC
        callback {if (! inv)
	{
		mem = 0.0;
		set_display(value[top],NORM);
		ready = 1;
		set_memdisp();
	}
	else
		memexch();}
        private xywh {76 139 31 21} color 93 labelcolor 4
      }
      Fl_Button but_Mst {
        label Mst
        callback {mem = value[top];
	set_display(value[top],NORM);
	ready = 1;
	set_memdisp();}
        private xywh {110 139 31 21} color 93
      }
      Fl_Button but_Mrc {
        label Mrc
        callback {value[top] = mem;
	set_display(value[top],NORM);
	ready = 1;}
        private xywh {144 139 30 21} color 93
      }
      Fl_Button check_inv {
        label inv
        callback {if (inv) 
	{
		inv = 0;
		setnormlabels();
	}
	else
	{
		inv = 1;
		setinvlabels();
	}}
        private xywh {6 44 32 21} type Toggle labelsize 11 labelcolor 4
      }
      Fl_Button but_quit {
        label Exit
        callback {win->hide();
delete win;}
        private xywh {145 44 29 21} labelfont 1 labelcolor 33
      }
    }
    code {init_value(0);
	drgmode = 1;
	base = 10;
	currentbrkt = 0;
	startbrkt[0] = 0;

	set_memdisp();
	set_brktdisp();
	radio_10->value(1);
	set_drgdisp();
	set_display(0.0,NONE);} {}
  }
  Function {~SciCalc()} {} {}
  Function {run(int px=-1,int py=-1)} {open
  } {
    code {win->show();
Fl::run();} {}
  }
  Function {handle_number(double numb)} {private
  } {
    code {int first;
double sign;

	if (ready) init_value(top);

	if (numb == -1.0) 
	if (dot) /* check whether we already have a dot */
		return;
	else 
	{
		dot = 1;
		set_display(value[top],DOT);
		return;
	}

	if (emode) 
	{
		sign = copysign(1.0, (double)exponent);
		if (abs(exponent)*10 + numb > 999) 
		{ /* cycle if exponent has > 3 digits */
			first = (int)floor((double)abs(exponent)/100.0);
			exponent = abs(exponent) - 100*first;
			exponent *= (int)sign;
		}
		exponent = exponent*10 + (int) (sign*numb);
		value[top] = mantissa*pow(10.0, (double)exponent);
		set_display(mantissa, EXP);
	}
	else if (numb < base)
	{ /* both decimal and non decimal number entry */
		sign = copysign(1.0, value[top]);
		if (dot && behind < 9) 
		{
			behind++;
			diver = diver/(double)base;
			value[top] += sign*diver*numb;
		}
		else 
		if ((! dot) && (value[top] < 1.0e10))
			value[top] = (double)base*value[top] + sign*numb;

		set_display(value[top],(mode)behind);
	}} {}
  }
  Function {handle_operator(Operator op)} {private
  } {
    code {int prevop, i, finished;

	switch (op)
	{
		case PLUS:
		case MINUS:
		case MULT:
		case DIV:
		case POW:
		case INVPOW:
			finished = 0;
			do 
			{
				if (top == startbrkt[currentbrkt]) finished = 1; /* is 1st operator */
				if (! finished) 
				{ /* compare priority of previous operators with current op */
					prevop = oper[top-1];
					if (priority[prevop] < priority[op])
						finished = 1;
					else 
					{ /* last op can be calculated */
						top--;
    					calc(top);
					}
				}
			} while (! finished);

			oper[top] = op;
			init_value(top+1);

			set_display(value[top-1],NORM);
			break;

		case EVAL:
			while (currentbrkt > 0) add_right_bracket();
			for (i = top; i > 0; i--) calc(i-1);
			top = 0;
			ready = 1;
			set_display(value[top],NORM);
			break;
	}} {}
  }
  Function {change_base(int newbase)} {open private
  } {
    code {int oldbase;

	oldbase = base;
	base = newbase;

	set_display(value[top], NORM);
	ready = 1;
	if ((oldbase == 16) || (base == 16)) setnormlabels();} {}
  }
  Function {set_display(double val,mode behind)} {open private
  } {
    code {int i;
char dispstr[40], expstr[10], str2[10];

	/* number or operator handled to get here so reset inv stuff */
/*
	if (inv) 
	{
		inv = 0;
		check_inv->value(0);
		setnormlabels();
	}*/
	if (behind >= 0) 
	{ /* format with appropriate number of decimal places */
		if (base == 10) 
		{
			emode = 0;
			strcpy(str2,"%.1f");
			str2[2] = behind + '0';
			sprintf(dispstr,str2,val);
		}
		else /* non base 10 display */
			cvttobase(val, base, behind, dispstr);
	}
	else 
	if (behind == DOT) 
	{ /* display the . at the right */
		if (base == 10) 
		{
			emode = 0;
			sprintf(dispstr,"%.1f",val);
			dispstr[strlen(dispstr)-1] = 0;
		}
		else
			cvttobase(val, base, behind, dispstr);
	}
	else if (behind == NORM) 
	{ /* normal display */
		if (base == 10) 
		{
			emode = 0;
			sprintf(dispstr,"%.9g",val);
		}
		else /* non base 10 display */
			cvttobase(val, base, behind, dispstr);
	}
	else 
	{ /* exponent entering display */
		sprintf(dispstr,"%.8f",val);
		for (i = strlen(dispstr); dispstr[i-1] == '0'; i--);
		dispstr[i] =0;
		strcat(dispstr, "e");
		sprintf(expstr,"%d",exponent);
		strcat(dispstr, expstr);
	}
	strcat(dispstr," ");
	dispstr[17] = 0;
	leddisplay->copy_label(dispstr);
	leddisplay->redraw();} {}
  }
  Function {set_memdisp()} {open private
  } {
    code {if (mem)
	box_M->label("M");
else
	box_M->label("");
box_M->redraw();} {}
  }
  Function {set_drgdisp()} {open private
  } {
    code {if (drgmode == 0)
	box_DEGRAD->label("DEG");
else 
{
	if (drgmode == 1)
		box_DEGRAD->label("RAD");
	else
		box_DEGRAD->label("GRAD");
}
box_DEGRAD->redraw();} {}
  }
  Function {set_brktdisp()} {open private
  } {
    code {char dispstr[40];

	if (currentbrkt > 0)
	{
		sprintf(dispstr, "%d [ max %d", currentbrkt, MaxNumBrkts);
		box_bracket->copy_label(dispstr);
	}
	else
		box_bracket->label("");
box_bracket->redraw();} {}
  }
  Function {add_left_bracket()} {private
  } {
    code {if (currentbrkt < MaxNumBrkts) 
	{
		currentbrkt++;
		startbrkt[currentbrkt] = top;
		ready = 1;
		set_brktdisp();
	}} {}
  }
  Function {add_right_bracket()} {private
  } {
    code {int i;

	if (currentbrkt > 0) 
	{
		for (i = top; i > startbrkt[currentbrkt]; i--) calc(i-1);
		top = startbrkt[currentbrkt];
		currentbrkt--;
		ready = 1;
	}
	set_display(value[top],NORM);
	set_brktdisp();} {}
  }
  Function {factorial()} {open
  } {
    code {double lg, alpha;

  /* uses gamma functions to get result for non-integer values */

	alpha = value[top] + 1.0;
	if ((floor(alpha) == alpha)&&(alpha <= 0.0))
	{
		init_value(0);
		leddisplay->label("Error: -ve integer ");
		leddisplay->redraw();
	}
	else
	if (alpha > 32)
	 {
		lg = exp(gammaln(alpha));
    		value[top] = lg;
   		 set_display(value[top],NORM);
		ready = 1;
	}
	else
	if (alpha > 1.0)
	{
		int n = (int)truncf(alpha);
		lg = 1.0;
		for (int i = 1; i <n; i++) lg *= i;
		value[top] = lg;
		set_display(value[top],NORM);
		ready = 1;
	}} {}
  }
  Function {exchange()} {} {
    code {double temp;

  /* check if we have 2 values to exchange */
  if (top > startbrkt[currentbrkt]) {
    temp = value[top];
    value[top] = value[top-1];
    value[top-1] = temp;

    set_display(value[top],NORM);
    ready = 1;
  }} {}
  }
  Function {exponent_pi()} {} {
    code {if ((value[top] == 0.0) || (ready)) {
    value[top] = M_PI;
    set_display(value[top],NORM);
    ready = 1;
  }
  else if ((! emode) && (base == 10)) {
    emode = 1;
    exponent = 0;
    mantissa = value[top];
    set_display(mantissa,EXP);
  }} {}
  }
  Function {calc(int i)} {} {
    code {switch (oper[i])
	 {
		case PLUS:	value[i] += value[i+1]; break;
		case MINUS:	value[i] -= value[i+1]; break;
		case MULT:	value[i] *= value[i+1]; break;
		case DIV:	value[i] /= value[i+1]; break;
		case POW:	value[i] = pow(value[i], value[i+1]); break;
		case INVPOW: value[i] = pow(value[i], 1.0/value[i+1]); break;
	}} {}
  }
  Function {init_value(int lev)} {open private
  } {
    code {top = lev;
	value[top] = 0.0;
	ready = 0;
	emode = 0;
	dot = 0;
	diver = 1.0;
	behind = 0;
	if (inv) 
	{
		inv = 0;
		check_inv->value(0);
		setnormlabels();
	}} {}
  }
  Function {cvttobase(double num,int base,mode behind,char *str)} {private
  } {
    code {double sign, div;
int place, digit, i;
char digstr[2];

	sign = copysign(1.0, num);
	num *= sign;
	if (sign == -1.0)
		sprintf(str, "-");
	else
		str[0] = 0;

	if (num == 0.0) 
	{
		sprintf(str, "0");
		if (behind > 0) 
		{
			strcat(str, ".");
			for(i = 0; i < behind; i++) strcat(str, "0");
		}
		return;
	}
	place = (int)( log(num)/log((double)base) );
	if (place < 0) place = 0;
	do 
	{
		div = pow((double)base, (double)place);
		digit = (int)(num/div);
		num -= (double)digit*div;
		if (place == -1) strcat(str, ".");
		place--;
		sprintf(digstr, "%x", digit);
		strcat(str, digstr);
		if (strlen(str) > 18) 
		{
			sprintf(str, "can't display");
			return;
		}
	} while ((place >= 0) || ((place >= -9) && (num != 0.0)));

	if ((place == -1) && ((behind == DOT) || (behind > 0)))
		strcat(str, ".");
	while ((behind > 0) && (behind >= -place)) 
	{
		strcat(str, "0");
		place--;
	}} {}
  }
  Function {setnormlabels()} {open private
  } {
    code {if (base <= 10)
	{
		but_sqrt->label("sqrt");  but_sqrt->shortcut(0);
		but_pow->label("x^y"); but_pow->shortcut(0);
		but_sin->label("sin");   but_sin->shortcut(0);
		but_cos->label("cos"); but_cos->shortcut(0);
		but_tan->label("tan");   but_tan->shortcut(0);
		but_log->label("log");  but_log->shortcut(0);
		but_sqrt->labelcolor(FL_BLUE);
		but_pow->labelcolor(FL_BLUE);
		but_sin->labelcolor(FL_BLUE);
		but_cos->labelcolor(FL_BLUE);
		but_tan->labelcolor(FL_BLUE);
		but_log->labelcolor(FL_BLUE);
	}
	else
	{
		but_sqrt->label("a");  but_sqrt->shortcut('a');
		but_pow->label("b");  but_pow->shortcut('b');
		but_sin->label("c");   but_sin->shortcut('c');
		but_cos->label("d");  but_cos->shortcut('d');
		but_tan->label("e");  but_tan->shortcut('e');
		but_log->label("f");   but_log->shortcut('f');
		but_sqrt->labelcolor(FL_BLACK);
		but_pow->labelcolor(FL_BLACK);
		but_sin->labelcolor(FL_BLACK);
		but_cos->labelcolor(FL_BLACK);
		but_tan->labelcolor(FL_BLACK);
		but_log->labelcolor(FL_BLACK);
	}
	but_ln->label("ln");
	but_int->label("int");
	but_dr->label("d->r");
	but_Mplus->label("M+");
	but_Mmult->label("M*");
	but_Mclear->label("MC");
	but_sqrt->redraw();
	but_pow->redraw();
	but_sin->redraw();
	but_cos->redraw();
	but_tan->redraw();
	but_log->redraw();
	but_ln->redraw();
	but_int->redraw();
	but_dr->redraw();
	but_Mplus->redraw();
	but_Mmult->redraw();
	but_Mclear->redraw();} {}
  }
  Function {setinvlabels()} {private
  } {
    code {if (base <= 10)
	{
		but_sqrt->label("x^2");
		but_pow->label("x^1/y");
		but_sin->label("asin");
		but_cos->label("acos");
		but_tan->label("atan");
		but_log->label("10^x");
		but_sqrt->labelcolor(FL_BLUE);
		but_pow->labelcolor(FL_BLUE);
		but_sin->labelcolor(FL_BLUE);
		but_cos->labelcolor(FL_BLUE);
		but_tan->labelcolor(FL_BLUE);
		but_log->labelcolor(FL_BLUE);
	}
	else
	{
		but_sqrt->label("a");
		but_pow->label("b");
		but_sin->label("c");
		but_cos->label("d");
		but_tan->label("e");
		but_log->label("f");
		but_sqrt->labelcolor(FL_BLACK);
		but_pow->labelcolor(FL_BLACK);
		but_sin->labelcolor(FL_BLACK);
		but_cos->labelcolor(FL_BLACK);
		but_tan->labelcolor(FL_BLACK);
		but_log->labelcolor(FL_BLACK);
	}
	but_ln->label("e^x");
	but_int->label("frac");
	but_dr->label("r->d");
	but_Mplus->label("M-");
	but_Mmult->label("M/");
	but_Mclear->label("Mex");
	but_sqrt->redraw();
	but_pow->redraw();
	but_sin->redraw();
	but_cos->redraw();
	but_tan->redraw();
	but_log->redraw();
	but_ln->redraw();
	but_int->redraw();
	but_dr->redraw();
	but_Mplus->redraw();
	but_Mmult->redraw();
	but_Mclear->redraw();} {}
  }
  Function {mem_exchange()} {private
  } {
    code {double temp;

	temp = mem;
	mem = value[top];
	value[top] = temp;

	set_display(value[top],NORM);
	ready = 1;
	set_memdisp();} {}
    code {printf("Hello, World!\\n");} {}
  }
  Function {to_drg(double angle)} {private return_type double
  } {
    code {if (drgmode == 0)
		return (M_PI*angle/180.0);
	else 
	if (drgmode == 2)
		return (M_PI*angle/100.0);
	else
		return (angle);} {}
  }
  Function {from_drg(double angle)} {private return_type double
  } {
    code {if (drgmode == 0)
		return (180.0*angle/M_PI);
	else 
	if (drgmode == 2)
		return (100.0*angle/M_PI);
	else
		return (angle);} {}
  }
  Function {memexch()} {open
  } {
    code {double temp;

	temp = mem;
	mem = value[top];
	value[top] = temp;
	set_display(value[top],NORM);
	ready = 1;
	set_memdisp();} {}
  }
}