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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="GNU source-highlight
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite">
<title>inlab-skeleton.cpp</title>
</head>
<body style="background-color:white">
<pre><i><span style="color:#9A1900">// This program is the skeleton code for the lab 10 in-lab.</span></i>
<i><span style="color:#9A1900">// It uses C++ streams for the file input,</span></i>
<i><span style="color:#9A1900">// and just prints out the data when read in from the file.</span></i>
<b><span style="color:#000080">#include</span></b> <span style="color:#FF0000"><iostream></span>
<b><span style="color:#000080">#include</span></b> <span style="color:#FF0000"><fstream></span>
<b><span style="color:#000080">#include</span></b> <span style="color:#FF0000"><sstream></span>
<b><span style="color:#000080">#include</span></b> <span style="color:#FF0000"><cstdlib></span>
<b><span style="color:#0000FF">using</span></b> <b><span style="color:#0000FF">namespace</span></b> std<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// main(): we want to use parameters</span></i>
<span style="color:#009900">int</span> <b><span style="color:#000000">main</span></b> <span style="color:#990000">(</span><span style="color:#009900">int</span> argc<span style="color:#990000">,</span> <span style="color:#009900">char</span><span style="color:#990000">**</span> argv<span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
<i><span style="color:#9A1900">// verify the correct number of parameters</span></i>
<b><span style="color:#0000FF">if</span></b> <span style="color:#990000">(</span>argc <span style="color:#990000">!=</span> <span style="color:#993399">2</span><span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
cout <span style="color:#990000"><<</span> <span style="color:#FF0000">"Must supply the input file name as the only parameter"</span> <span style="color:#990000"><<</span> endl<span style="color:#990000">;</span>
<b><span style="color:#000000">exit</span></b><span style="color:#990000">(</span><span style="color:#993399">1</span><span style="color:#990000">);</span>
<span style="color:#FF0000">}</span>
<i><span style="color:#9A1900">// attempt to open the supplied file</span></i>
<i><span style="color:#9A1900">// must be opened in binary mode as otherwise trailing whitespace is discarded</span></i>
<span style="color:#008080">ifstream</span> <b><span style="color:#000000">file</span></b><span style="color:#990000">(</span>argv<span style="color:#990000">[</span><span style="color:#993399">1</span><span style="color:#990000">],</span> ifstream<span style="color:#990000">::</span>binary<span style="color:#990000">);</span>
<i><span style="color:#9A1900">// report any problems opening the file and then exit</span></i>
<b><span style="color:#0000FF">if</span></b> <span style="color:#990000">(!</span>file<span style="color:#990000">.</span><b><span style="color:#000000">is_open</span></b><span style="color:#990000">())</span> <span style="color:#FF0000">{</span>
cout <span style="color:#990000"><<</span> <span style="color:#FF0000">"Unable to open file '"</span> <span style="color:#990000"><<</span> argv<span style="color:#990000">[</span><span style="color:#993399">1</span><span style="color:#990000">]</span> <span style="color:#990000"><<</span> <span style="color:#FF0000">"'."</span> <span style="color:#990000"><<</span> endl<span style="color:#990000">;</span>
<b><span style="color:#000000">exit</span></b><span style="color:#990000">(</span><span style="color:#993399">2</span><span style="color:#990000">);</span>
<span style="color:#FF0000">}</span>
<i><span style="color:#9A1900">// read in the first section of the file: the prefix codes</span></i>
<b><span style="color:#0000FF">while</span></b> <span style="color:#990000">(</span><b><span style="color:#0000FF">true</span></b><span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
<span style="color:#008080">string</span> character<span style="color:#990000">,</span> prefix<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// read in the first token on the line</span></i>
file <span style="color:#990000">>></span> character<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// did we hit the separator?</span></i>
<b><span style="color:#0000FF">if</span></b> <span style="color:#990000">(</span>character<span style="color:#990000">[</span><span style="color:#993399">0</span><span style="color:#990000">]</span> <span style="color:#990000">==</span> <span style="color:#FF0000">'-'</span> <span style="color:#990000">&&</span> character<span style="color:#990000">.</span><b><span style="color:#000000">length</span></b><span style="color:#990000">()</span> <span style="color:#990000">></span> <span style="color:#993399">1</span><span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
<b><span style="color:#0000FF">break</span></b><span style="color:#990000">;</span>
<span style="color:#FF0000">}</span>
<i><span style="color:#9A1900">// check for space</span></i>
<b><span style="color:#0000FF">if</span></b> <span style="color:#990000">(</span>character <span style="color:#990000">==</span> <span style="color:#FF0000">"space"</span><span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
character <span style="color:#990000">=</span> <span style="color:#FF0000">" "</span><span style="color:#990000">;</span>
<span style="color:#FF0000">}</span>
<i><span style="color:#9A1900">// read in the prefix code</span></i>
file <span style="color:#990000">>></span> prefix<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// do something with the prefix code</span></i>
cout <span style="color:#990000"><<</span> <span style="color:#FF0000">"character '"</span> <span style="color:#990000"><<</span> character <span style="color:#990000"><<</span> <span style="color:#FF0000">"' has prefix code '"</span> <span style="color:#990000"><<</span> prefix <span style="color:#990000"><<</span> <span style="color:#FF0000">"'"</span> <span style="color:#990000"><<</span> endl<span style="color:#990000">;</span>
<span style="color:#FF0000">}</span>
<i><span style="color:#9A1900">// read in the second section of the file: the encoded message</span></i>
<span style="color:#008080">stringstream</span> sstm<span style="color:#990000">;</span>
<b><span style="color:#0000FF">while</span></b> <span style="color:#990000">(</span><b><span style="color:#0000FF">true</span></b><span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
<span style="color:#008080">string</span> bits<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// read in the next set of 1's and 0's</span></i>
file <span style="color:#990000">>></span> bits<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// check for the separator</span></i>
<b><span style="color:#0000FF">if</span></b> <span style="color:#990000">(</span>bits<span style="color:#990000">[</span><span style="color:#993399">0</span><span style="color:#990000">]</span> <span style="color:#990000">==</span> <span style="color:#FF0000">'-'</span><span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
<b><span style="color:#0000FF">break</span></b><span style="color:#990000">;</span>
<span style="color:#FF0000">}</span>
<i><span style="color:#9A1900">// add it to the stringstream</span></i>
sstm <span style="color:#990000"><<</span> bits<span style="color:#990000">;</span>
<span style="color:#FF0000">}</span>
<span style="color:#008080">string</span> allbits <span style="color:#990000">=</span> sstm<span style="color:#990000">.</span><b><span style="color:#000000">str</span></b><span style="color:#990000">();</span>
<i><span style="color:#9A1900">// at this point, all the bits are in the 'allbits' string</span></i>
cout <span style="color:#990000"><<</span> <span style="color:#FF0000">"All the bits: "</span> <span style="color:#990000"><<</span> allbits <span style="color:#990000"><<</span> endl<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// close the file before exiting</span></i>
file<span style="color:#990000">.</span><b><span style="color:#000000">close</span></b><span style="color:#990000">();</span>
<span style="color:#FF0000">}</span>
</pre>
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