SunOS man pages : dc (1)
User Commands dc(1)
NAME
dc  desk calculator
SYNOPSIS
dc [ filename ]
DESCRIPTION
dc is an arbitrary precision arithmetic package. Ordinarily
it operates on decimal integers, but one may specify an
input base, output base, and a number of fractional digits
to be maintained. The overall structure of dc is a stacking
(reverse Polish) calculator. If an argument is given, input
is taken from that file until its end, then from the stan
dard input.
bc is a preprocessor for dc that provides infix notation and
a Clike syntax that implements functions. bc also provides
reasonable control structures for programs. See bc(1).
USAGE
The following constructions are recognized:
number
The value of the number is pushed on the stack. A
number is an unbroken string of the digits 09. It
may be preceded by an underscore (_) to input a nega
tive number. Numbers may contain decimal points.
+  / * % ^
The top two values on the stack are added (+), sub
tracted (), multiplied (*), divided (/), remaindered
(%), or exponentiated (^). The two entries are popped
off the stack; the result is pushed on the stack in
their place. Any fractional part of an exponent is
ignored.
sx The top of the stack is popped and stored into a
register named x, where x may be any character. If
the s is capitalized, x is treated as a stack and the
value is pushed on it.
lx The value in register x is pushed on the stack. The
register x is not altered. All registers start with
zero value. If the l is capitalized, register x is
treated as a stack and its top value is popped onto
the main stack.
d The top value on the stack is duplicated.
p The top value on the stack is printed. The top value
remains unchanged.
SunOS 5.8 Last change: 28 Mar 1995 1
User Commands dc(1)
P Interprets the top of the stack as an ASCII string,
removes it, and prints it.
f All values on the stack are printed.
q Exits the program. If executing a string, the recur
sion level is popped by two.
Q Exits the program. The top value on the stack is
popped and the string execution level is popped by
that value.
x Treats the top element of the stack as a character
string and executes it as a string of dc commands.
X Replaces the number on the top of the stack with its
scale factor.
[ ... ]
Puts the bracketed ASCII string onto the top of the
stack.
<x >x =x
The top two elements of the stack are popped and com
pared. Register x is evaluated if they obey the stated
relation.
v Replaces the top element on the stack by its square
root. Any existing fractional part of the argument
is taken into account, but otherwise the scale factor
is ignored.
! Interprets the rest of the line as a shell command.
c All values on the stack are popped.
i The top value on the stack is popped and used as the
number radix for further input.
I Pushes the input base on the top of the stack.
o The top value on the stack is popped and used as the
number radix for further output.
O Pushes the output base on the top of the stack.
k The top of the stack is popped, and that value is used
as a nonnegative scale factor: the appropriate
number of places are printed on output, and main
tained during multiplication, division, and exponen
tiation. The interaction of scale factor, input base,
and output base will be reasonable if all are changed
SunOS 5.8 Last change: 28 Mar 1995 2
User Commands dc(1)
together.
K Pushes the current scale factor on the top of the
stack.
z The stack level is pushed onto the stack.
Z Replaces the number on the top of the stack with its
length.
? A line of input is taken from the input source (usu
ally the terminal) and executed.
Y Displays dc debugging information.
; : are used by bc(1) for array operations.
EXAMPLES
Example 1: Printing the first ten values of n!
This example prints the first ten values of n!:
[la1+dsa*pla10>y]sy
0sa1
lyx
ATTRIBUTES
See attributes(5) for descriptions of the following attri
butes:
____________________________________________________________
 ATTRIBUTE TYPE  ATTRIBUTE VALUE 
__________________________________________________________
 Availability  SUNWesu 
__________________________________________________________
SEE ALSO
bc(1), attributes(5)
DIAGNOSTICS
x is unimplemented
x is an octal number.
out of space
The free list is exhausted (too many digits).
out of stack space
Too many pushes onto the stack (stack overflow).
empty stack
Too many pops from the stack (stack underflow).
SunOS 5.8 Last change: 28 Mar 1995 3
User Commands dc(1)
nesting depth
Too many levels of nested execution.
divide by 0
Division by zero.
sqrt of neg number
Square root of a negative number is not defined (no
imaginary numbers).
exp not an integer
dc only processes integer exponentiation.
exp too big
The largest exponent allowed is 999.
input base is too large
The input base x: 2<= x <= 16.
input base is too small
The input base x: 2<= x <= 16.
output base is too large
The output base must be no larger than BC_BASE_MAX.
invalid scale factor
Scale factor cannot be less than 1.
scale factor is too large
A scale factor cannot be larger than BC_SCALE_MAX.
symbol table overflow
Too many variables have been specified.
invalid index
Index cannot be less than 1.
index is too large
An index cannot be larger than BC_DIM_MAX.
SunOS 5.8 Last change: 28 Mar 1995 4



