page474.html
来自「wqeqwvrw rkjqhwrjwq jkhrjqwhrwq jkhrwq」· HTML 代码 · 共 49 行
HTML
49 行
<HTML>
<HEAD>
<TITLE>Implementation</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<img src="cover75.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/cover75.gif" alt="Logo" align=right>
<b>Data Structures and Algorithms
with Object-Oriented Design Patterns in C++</b><br>
<A NAME="tex2html7777" HREF="page475.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page475.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/next_motif.gif"></A> <A NAME="tex2html7775" HREF="page472.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page472.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/up_motif.gif"></A> <A NAME="tex2html7771" HREF="page473.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page473.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/previous_motif.gif"></A> <A NAME="tex2html7779" HREF="page9.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page9.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/contents_motif.gif"></A> <A NAME="tex2html7780" HREF="page620.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page620.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="index_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/index_motif.gif"></A> <BR><HR>
<H3><A NAME="SECTION0015512000000000000000">Implementation</A></H3>
<P>
We now describe the implementation of a random number generator
based on Equation <A HREF="page473.html#eqnalgsschrage" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page473.html#eqnalgsschrage"><IMG ALIGN=BOTTOM ALT="gif" SRC="cross_ref_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/cross_ref_motif.gif"></A>.
Program <A HREF="page474.html#prograndom1h" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page474.html#prograndom1h"><IMG ALIGN=BOTTOM ALT="gif" SRC="cross_ref_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/cross_ref_motif.gif"></A> defines the <tt>RandomNumberGenerator</tt> class.
This class has only <em>static members</em><A NAME=33999> </A>.
Because there can only be one instance of a static data member,
the implementation of the <tt>RandomNumberGenerator</tt> class
follows the <em>singleton</em><A NAME=34002> </A> design pattern.
<P>
<P><A NAME="34153"> </A><A NAME="prograndom1h"> </A> <IMG WIDTH=575 HEIGHT=238 ALIGN=BOTTOM ALT="program34003" SRC="img2031.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img2031.gif" ><BR>
<STRONG>Program:</STRONG> <tt>RandomNumberGenerator</tt> Class Definition<BR>
<P>
<P>
Program <A HREF="page474.html#prograndom1c" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page474.html#prograndom1c"><IMG ALIGN=BOTTOM ALT="gif" SRC="cross_ref_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/cross_ref_motif.gif"></A> gives
the implementation of the <tt>RandomNumberGenerator</tt> class.
The <tt>SetSeed</tt> function is used
to specify the initial seed, <IMG WIDTH=19 HEIGHT=23 ALIGN=MIDDLE ALT="tex2html_wrap_inline69291" SRC="img1996.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img1996.gif" >.
The seed must fall between 0 and <I>m</I>-1.
If it does not, an exception is thrown.
<P>
<P><A NAME="34157"> </A><A NAME="prograndom1c"> </A> <IMG WIDTH=575 HEIGHT=390 ALIGN=BOTTOM ALT="program34017" SRC="img2032.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img2032.gif" ><BR>
<STRONG>Program:</STRONG> <tt>RandomNumberGenerator</tt> Class<tt>SetSeed</tt> and <tt>Next</tt> Member Function Definitions<BR>
<P>
<P>
The <tt>Next</tt> function generates the elements of the random sequence.
Each subsequent call returns the next element of the sequence.
The implementation follows directly from Equation <A HREF="page473.html#eqnalgsschrage" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page473.html#eqnalgsschrage"><IMG ALIGN=BOTTOM ALT="gif" SRC="cross_ref_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/cross_ref_motif.gif"></A>.
Notice that the return value is normalized.
Therefore, the values computed by the <tt>Next</tt> function are uniformly
distributed on the interval (0,1).
<P>
<HR><A NAME="tex2html7777" HREF="page475.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page475.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/next_motif.gif"></A> <A NAME="tex2html7775" HREF="page472.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page472.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/up_motif.gif"></A> <A NAME="tex2html7771" HREF="page473.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page473.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/previous_motif.gif"></A> <A NAME="tex2html7779" HREF="page9.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page9.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/contents_motif.gif"></A> <A NAME="tex2html7780" HREF="page620.html" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page620.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="index_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/index_motif.gif"></A> <P><ADDRESS>
<img src="bruno.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/bruno.gif" alt="Bruno" align=right>
<a href="javascript:if(confirm('http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/copyright.html \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?'))window.location='http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/copyright.html'" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/copyright.html">Copyright © 1997</a> by <a href="javascript:if(confirm('http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/signature.html \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?'))window.location='http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/signature.html'" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/signature.html">Bruno R. Preiss, P.Eng.</a> All rights reserved.
</ADDRESS>
</BODY>
</HTML>
⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?