fprintf(stderr,prt_ln,"\x01b[1;32;40mvar\x01b[0;37;44m, display value of variable var");
fprintf(stderr,prt_ln,"\x01b[1;32;40mdeg/rad\x01b[0;37;44m, assume degrees/radians for trig. functions (rad default)");
fprintf(stderr,prt_ln,"built-in single argument functions:");
fprintf(stderr,prt_ln,"sin asin cos acos sinh cosh log log10 int exp sqrt fract push pop");
fprintf(stderr,prt_ln,"\x01b[1;32;40m+/-, -/+, +-, -+\x01b[0;37;44m change sign of top of stack");
fprintf(stderr,prt_ln,"\x01b[1;32;40m=\x01b[0;37;44m display value on top of stack");
fprintf(stderr,prt_ln,"\x01b[1;32;40m=s\x01b[0;37;44m display values for entire stack");
fprintf(stderr,prt_ln,"\x01b[1;32;40m[Qq](uit)?\x01b[0;37;44m to quit, \x01b[1;32;40m[Ss](tat)?\x01b[0;37;44m to display calculator status");
fprintf(stderr,prt_ln,"\x01b[1;32;40m[Cc](ls)?\x01b[0;37;44m to clear screen, \x01b[1;32;40m[Hh](elp)?\x01b[0;37;44m to display this help");
fprintf(stderr,prt_ln,"\nPress \x01b[1;32;40m<Enter>\x01b[0;37;44m to Continue. \x01b[1;32;40m[Qq](uit)?<Enter>\x01b[0;37;44m to Return to Calculations.");
getline(dummy);
if ( dummy ~~ Quit ) return;
copyright;
fprintf(stderr,prt_ln,"\x01b[1;32;40mrtd\x01b[0;37;44m - top of stack converted from radians to degrees");
fprintf(stderr,prt_ln,"\x01b[1;32;40mdtr\x01b[0;37;44m - top of stack converted from degrees to radians");
fprintf(stderr,prt_ln,"\x01b[1;32;40mcti\x01b[0;37;44m - top of stack converted from cm to inches");
fprintf(stderr,prt_ln,"\x01b[1;32;40mitc\x01b[0;37;44m - top of stack converted from inches to cm");
fprintf(stderr,prt_ln,"\x01b[1;32;40mktm\x01b[0;37;44m - top of stack converted from kilometers to miles");
fprintf(stderr,prt_ln,"\x01b[1;32;40mmtk\x01b[0;37;44m - top of stack converted from miles to kilometers");
fprintf(stderr,prt_ln,"\x01b[1;32;40mltg\x01b[0;37;44m - top of stack converted from Liters to gallons");
fprintf(stderr,prt_ln,"\x01b[1;32;40mgtl\x01b[0;37;44m - top of stack converted from gallons to Liters");
fprintf(stderr,prt_ln,"\x01b[1;32;40mjdn\x01b[0;37;44m - compute julian day number from date (yr mo day jdn)");
fprintf(stderr,prt_ln,"\x01b[1;32;40mcal\x01b[0;37;44m - compute date from julian day number");