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.TH MATHCALC 1
.SH NAME
mathcalc \- interface to a TclLib calculator module
.SH SYNOPSIS
.B mathcalc
.SH DESCRIPTION
.I Mathcalc
reads simple expressions from the standard input, evaluates them,
and prints the results on the standard output.
It is a command line interface to a
.L TclLib
calculator module.
It prompts the user
.RL ( calc% )
for each line, and
exits on end-of-file or on reading a line containing
.RB ` quit '.
.PP
Values are either integer or floating-point constants.
A floating-point constant has a decimal point, an exponent, or both.
Integer constants are taken as hexadecimal if they start
.BR 0x ,
octal if they start with
.BR 0 ,
and otherwise decimal.
.PP
Expressions are formed using the following C-like operators
and predefined functions, shown in order of decreasing priority:
.TP
.B - + ! ~
unary: negate, plus (no-op); logical not and one's complement (integers only)
.TP
.B * / %
multiply and divide, integer remainder
.TP
.B + -
add, subtract
.TP
.B << >>
left shift, right shift (integers only)
.TP
.B < <= >= >
relational operators
.TP
.B == !=
equality, inequality
.TP
.B &
bit-wise and (integer only)
.TP
.B ^
bit-wise exclusive-OR (integer only)
.TP
.B |
bit-wise or (integer only)
.TP
.B &&
logical and
.TP
.B ||
logical or
.TP
.IB a ? b : c
conditional: if
.I a
is non-zero, the result is
.IR b ,
otherwise
.I c
.PP
.I Mathcalc
provides the following mathematical functions:
.IP
.EX
.ta +\w'hypot\ \ 'u
abs ceil fmod sin
acos cos hypot sinh
asin cosh log sqrt
atan exp log10 tan
atan2 floor pow tanh
.EE
.PP
See
.IR math-elem (2)
for the usual definitions.
.SH SOURCE
.B /appl/cmd/mathcalc.b
.br
.B /appl/lib/tcl_calc.b
.SH DIAGNOSTICS
.TF ARGXXX
.TP
.B ARRG!
bad constant syntax
.TP
.B Error!
bad expression syntax, or any other error
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