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main.cpp.html
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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>main.cpp</title>
</head>
<body style="background-color:white">
<pre><i><span style="color:#9A1900">// main.cpp</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"><time.h></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>
<b><span style="color:#0000FF">extern</span></b> <span style="color:#FF0000">"C"</span> <span style="color:#009900">long</span> <b><span style="color:#000000">vecsum</span></b> <span style="color:#990000">(</span><span style="color:#009900">long</span><span style="color:#990000">*,</span> <span style="color:#009900">long</span><span style="color:#990000">);</span>
<i><span style="color:#9A1900">// Purpose: This main program produces a vector of random numbers</span></i>
<i><span style="color:#9A1900">// between 0 and 99, then calls the externally defined function</span></i>
<i><span style="color:#9A1900">// 'vecsum' to add up the elements of the vector.</span></i>
<i><span style="color:#9A1900">// Originally written by Adam Ferrari, and updated by Aaron Bloomfield</span></i>
<span style="color:#009900">int</span> <b><span style="color:#000000">main</span></b> <span style="color:#990000">()</span> <span style="color:#FF0000">{</span>
<i><span style="color:#9A1900">// delcare the local variables</span></i>
<span style="color:#009900">long</span> n<span style="color:#990000">,</span> <span style="color:#990000">*</span>vec<span style="color:#990000">,</span> sum<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// how big is the array we want to use?</span></i>
cout <span style="color:#990000"><<</span> <span style="color:#FF0000">"Please enter a array size: "</span><span style="color:#990000">;</span>
cin <span style="color:#990000">>></span> n<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// sanity check the array size</span></i>
<b><span style="color:#0000FF">if</span></b> <span style="color:#990000">(</span>n <span style="color:#990000"><=</span> <span style="color:#993399">0</span><span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
cerr <span style="color:#990000"><<</span> <span style="color:#FF0000">"Array size must be greater than zero.</span><span style="color:#CC33CC">\n</span><span style="color:#FF0000">"</span><span style="color:#990000">;</span>
<b><span style="color:#0000FF">return</span></b> <span style="color:#993399">1</span><span style="color:#990000">;</span>
<span style="color:#FF0000">}</span>
<i><span style="color:#9A1900">// allocate the array</span></i>
vec <span style="color:#990000">=</span> <b><span style="color:#0000FF">new</span></b> <span style="color:#009900">long</span><span style="color:#990000">[</span>n<span style="color:#990000">];</span>
<i><span style="color:#9A1900">// use current time as random seed</span></i>
<b><span style="color:#000000">srand</span></b><span style="color:#990000">((</span><span style="color:#009900">unsigned</span><span style="color:#990000">)</span> <b><span style="color:#000000">time</span></b><span style="color:#990000">(</span>NULL<span style="color:#990000">));</span>
<i><span style="color:#9A1900">// fill the array with random values</span></i>
<b><span style="color:#0000FF">for</span></b> <span style="color:#990000">(</span><span style="color:#009900">long</span> i <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span> i <span style="color:#990000"><</span> n<span style="color:#990000">;</span> <span style="color:#990000">++</span>i<span style="color:#990000">)</span> <span style="color:#FF0000">{</span>
vec<span style="color:#990000">[</span>i<span style="color:#990000">]</span> <span style="color:#990000">=</span> <b><span style="color:#000000">rand</span></b><span style="color:#990000">()</span> <span style="color:#990000">%</span> <span style="color:#993399">100</span><span style="color:#990000">;</span>
cout <span style="color:#990000"><<</span> <span style="color:#FF0000">"</span><span style="color:#CC33CC">\t</span><span style="color:#FF0000">vec["</span> <span style="color:#990000"><<</span> i <span style="color:#990000"><<</span> <span style="color:#FF0000">"] = "</span> <span style="color:#990000"><<</span> vec<span style="color:#990000">[</span>i<span style="color:#990000">]</span> <span style="color:#990000"><<</span> endl<span style="color:#990000">;</span>
<span style="color:#FF0000">}</span>
<i><span style="color:#9A1900">// sum up the array and print out results</span></i>
sum <span style="color:#990000">=</span> <b><span style="color:#000000">vecsum</span></b><span style="color:#990000">(</span>vec<span style="color:#990000">,</span> n<span style="color:#990000">);</span>
cout <span style="color:#990000"><<</span> <span style="color:#FF0000">"The sum of all array elements is "</span> <span style="color:#990000"><<</span> sum <span style="color:#990000"><<</span> endl<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// properly deallocate the array</span></i>
<b><span style="color:#0000FF">delete</span></b> <span style="color:#990000">[]</span> vec<span style="color:#990000">;</span>
<i><span style="color:#9A1900">// all done!</span></i>
<b><span style="color:#0000FF">return</span></b> <span style="color:#993399">0</span><span style="color:#990000">;</span>
<span style="color:#FF0000">}</span>
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