D.2.2.11 number_pi
..................
Procedure from library general.lib (see general_lib).

Usage:
number_pi(n); n positive integer

Return:
pi (area of unit circle) up to n decimal digits (no rounding)

 - of type string if no basering of char 0 is defined,

 - of type number, if a basering of char 0 is defined

Display:
decimal format of pi if printlevel > 0 (default:printlevel=0 )

Note:
procedure uses algorithm of S. Rabinowitz

Example:
LIB "general.lib";
number_pi(11);"";
==> 3.1415926535
==> 
ring r = (real,10),t,dp;
number pi = number_pi(11); pi;
==> 3.1415926536

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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; User manual for <a href="http://www.singular.uni-kl.de/"><i>Singular</i></a> version 2-0-4, October 2002,
generated by <a href="http://www.gnu.org/software/texinfo/"><i>texi2html</i></a>.
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