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-<head>
-<title>dc(1) - Plan 9 from User Space</title>
-<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
-</head>
-<body bgcolor=#ffffff>
-<table border=0 cellpadding=0 cellspacing=0 width=100%>
-<tr height=10><td>
-<tr><td width=20><td>
-<tr><td width=20><td><b>DC(1)</b><td align=right><b>DC(1)</b>
-<tr><td width=20><td colspan=2>
- <br>
-<p><font size=+1><b>NAME </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- dc &ndash; desk calculator<br>
-
-</table>
-<p><font size=+1><b>SYNOPSIS </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <tt><font size=+1>dc</font></tt> [ <i>file</i> ]<br>
-
-</table>
-<p><font size=+1><b>DESCRIPTION </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <i>Dc</i> is an arbitrary precision desk calculator. 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 <i>dc</i> is a stacking (reverse Polish) calculator.
- If an argument is given, input is taken from that file until its
- end, then from the standard input. The following constructions
- are recognized:<br>
- number<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- The value of the number is pushed on the stack. A number is an
- unbroken string of the digits <tt><font size=+1>0&#8722;9A&#8722;F</font></tt> or <tt><font size=+1>0&#8722;9a&#8722;f</font></tt>. A hexadecimal
- number beginning with a lower case letter must be preceded by
- a zero to distinguish it from the command associated with the
- letter. It may be preceded by an underscore <tt><font size=+1>_</font></tt> to
- input a negative number. Numbers may contain decimal points.<br>
-
- </table>
- <tt><font size=+1>+ &nbsp;&nbsp;&nbsp;&#8722; / &nbsp;&nbsp;&nbsp;* &nbsp;&nbsp;&nbsp;% &nbsp;&nbsp;&nbsp;^<br>
- </font></tt>
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- Add <tt><font size=+1>+</font></tt>, subtract <tt><font size=+1>&#8722;</font></tt>, multiply <tt><font size=+1>*</font></tt>, divide <tt><font size=+1>/</font></tt>, remainder <tt><font size=+1>%</font></tt>, or exponentiate
- <tt><font size=+1>^</font></tt> the top two values on the stack. 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.<br>
-
- </table>
- <tt><font size=+1>s</font></tt><i>x<br>
- </i><tt><font size=+1>S</font></tt><i>x</i>&nbsp;&nbsp;&nbsp;&nbsp;Pop the top of the stack and store into a register named <i>x</i>,
- where <i>x</i> may be any character. Under operation <tt><font size=+1>S</font></tt> register <i>x</i> is
- treated as a stack and the value is pushed on it.<br>
- <tt><font size=+1>l</font></tt><i>x<br>
- </i><tt><font size=+1>L</font></tt><i>x</i>&nbsp;&nbsp;&nbsp;&nbsp;Push the value in register <i>x</i> onto the stack. The register <i>x</i>
- is not altered. All registers start with zero value. Under operation
- <tt><font size=+1>L</font></tt> register <i>x</i> is treated as a stack and its top value is popped
- onto the main stack.<br>
- <tt><font size=+1>d</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Duplicate the top value on the stack.<br>
- <tt><font size=+1>p</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Print the top value on the stack. The top value remains unchanged.
- <tt><font size=+1>P</font></tt> interprets the top of the stack as an text string, removes it,
- and prints it.<br>
- <tt><font size=+1>f</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Print the values on the stack.<br>
- <tt><font size=+1>q<br>
- Q</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Exit the program. If executing a string, the recursion level
- is popped by two. Under operation <tt><font size=+1>Q</font></tt> the top value on the stack
- is popped and the string execution level is popped by that value.<br>
- <tt><font size=+1>x</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Treat the top element of the stack as a character string and
- execute it as a string of <i>dc</i> commands.<br>
- <tt><font size=+1>X</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Replace the number on the top of the stack with its scale factor.<br>
- <tt><font size=+1>[ ... ]<br>
- </font></tt>
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- Put the bracketed text string on the top of the stack.<br>
-
- </table>
- <tt><font size=+1>&lt;</font></tt><i>x<br>
- </i><tt><font size=+1>&gt;</font></tt><i>x<br>
- </i><tt><font size=+1>=</font></tt><i>x</i>&nbsp;&nbsp;&nbsp;&nbsp;Pop and compare the top two elements of the stack. Register
- <i>x</i> is executed if they obey the stated relation.<br>
- <tt><font size=+1>v</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Replace 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.<br>
- <tt><font size=+1>!</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interpret the rest of the line as a shell command.<br>
- <tt><font size=+1>c</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Clear the stack.<br>
- <tt><font size=+1>i</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The top value on the stack is popped and used as the number base
- for further input.<br>
- <tt><font size=+1>I</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Push the input base on the top of the stack.<br>
- <tt><font size=+1>o</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The top value on the stack is popped and used as the number base
- for further output. In bases larger than 10, each &#8216;digit&#8217; prints
- as a group of decimal digits.<br>
- <tt><font size=+1>O</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Push the output base on the top of the stack.<br>
- <tt><font size=+1>k</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pop the top of the stack, and use that value 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.
- <tt><font size=+1>z</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Push the stack level onto the stack.<br>
- <tt><font size=+1>Z</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Replace the number on the top of the stack with its length.<br>
- <tt><font size=+1>?</font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A line of input is taken from the input source (usually the terminal)
- and executed.<br>
- <tt><font size=+1>; :</font></tt>&nbsp;&nbsp;&nbsp;Used by <i>bc</i> for array operations.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- The scale factor set by <tt><font size=+1>k</font></tt> determines how many digits are kept
- to the right of the decimal point. If <i>s</i> is the current scale factor,
- <i>sa</i> is the scale of the first operand, <i>sb</i> is the scale of the second,
- and <i>b</i> is the (integer) second operand, results are truncated to
- the following scales.<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <tt><font size=+1>+</font></tt>,<tt><font size=+1>&#8722; </font></tt>&nbsp;&nbsp;&nbsp;&nbsp;max(<i>sa,sb</i>)<br>
- <tt><font size=+1>* </font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;min(<i>sa</i>+<i>sb</i> , max(<i>s,sa,sb</i>))<br>
- <tt><font size=+1>/ </font></tt><i>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;s<br>
- </i><tt><font size=+1>% </font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;so that dividend = divisor*quotient + remainder; remainder has
- sign of dividend<br>
- <tt><font size=+1>^ </font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;min(<i>sa</i>&#215;|<i>b</i>|, max(<i>s,sa</i>))<br>
- <tt><font size=+1>v </font></tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;max(<i>s,sa</i>)<br>
-
- </table>
-
-</table>
-<p><font size=+1><b>EXAMPLES </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- Print the first ten values of <i>n</i>!<br>
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <tt><font size=+1>[la1+dsa*pla10&gt;y]sy<br>
- 0sa1<br>
- lyx<br>
- </font></tt>
- </table>
-
-</table>
-<p><font size=+1><b>SOURCE </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <tt><font size=+1>/usr/local/plan9/src/cmd/dc.c<br>
- </font></tt>
-</table>
-<p><font size=+1><b>SEE ALSO </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <a href="../man1/bc.html"><i>bc</i>(1)</a>, <a href="../man1/hoc.html"><i>hoc</i>(1)</a><br>
-
-</table>
-<p><font size=+1><b>DIAGNOSTICS </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <i>x</i> <tt><font size=+1>is unimplemented</font></tt>, where <i>x</i> is an octal number: an internal error.<br>
- &#8216;Out of headers&#8217; for too many numbers being kept around.<br>
- &#8216;Nesting depth&#8217; for too many levels of nested execution.<br>
-
-</table>
-<p><font size=+1><b>BUGS </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- When the input base exceeds 16, there is no notation for digits
- greater than <tt><font size=+1>F</font></tt>.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- Past its time.<br>
-
-</table>
-
-<td width=20>
-<tr height=20><td>
-</table>
-<!-- TRAILER -->
-<table border=0 cellpadding=0 cellspacing=0 width=100%>
-<tr height=15><td width=10><td><td width=10>
-<tr><td><td>
-<center>
-<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
-</center>
-</table>
-<!-- TRAILER -->
-</body></html>