dc.1 (2010 09)

dc(1) dc(1)

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 out-

put. See below for notes on output base.

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 non-negative scale factor:

the appropriate number of places are printed on output, and maintained during

multiplication, division, and exponentiation. The interaction of scale factor, input

base, and output base will be reasonable if all are changed together.

K pushes the 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 (usually the terminal) and executed.

; and : Used by bc for array operations.

Y Generates debugging output for dc itself.

The input base may be any number, but only the digits 0-9 and A-F are available for input, thus limiting

the usefulness of bases outside the range 1-16. All 16 possible digits may be used in any base; they

always take their conventional values.

The output base may be any number. Bases in the range of 2-16 generate the "usual" results, with the

letters A-F representing the values from 10 through 16. Bases 0 and 1 generate a string of

1s whose

length is the value of the number. Base − 1 generates a similar string consisting of

s. Other bases have

each "digit" represented as a (multi-digit) decimal number giving the ordinal of that digit. Each "digit" is

signed for negative bases. "Digits" are separated by spaces. Given the deﬁnition of output base, the com-

mand

Op always yields "10" (in a representation appropriate to the base);

O1-p yields useful informa-

tion about the output base.

DIAGNOSTICS

is unimplemented Where x is an octal number.

stack empty There are insufﬁcient elements on the stack to do what was asked.

Out of space The free list is exhausted (too many digits).

Out of headers Too many numbers are being kept around.

Out of pushdown Too many items are on the stack.

Nesting Depth There are too many levels of nested execution.

EXAMPLES

This example prints the ﬁrst ten values of n! (n factorial):

[la1+dsa*pla10>y]sy

0sa1

lyx