slides/code/12-memory/strings.c.html

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<pre><b><span style="color:#000080">#include</span></b> <span style="color:#FF0000">&lt;stdlib.h&gt;</span>
<b><span style="color:#000080">#include</span></b> <span style="color:#FF0000">&lt;string.h&gt;</span>
<b><span style="color:#000080">#include</span></b> <span style="color:#FF0000">&lt;stdio.h&gt;</span>

<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>
    <span style="color:#009900">int</span> i <span style="color:#990000">=</span> <span style="color:#993399">0</span><span style="color:#990000">;</span>
    <i><span style="color:#9A1900">// allocate a space in memory for result</span></i>
    <span style="color:#009900">char</span> <span style="color:#990000">*</span>result <span style="color:#990000">=</span> <span style="color:#990000">(</span><span style="color:#009900">char</span> <span style="color:#990000">*)</span> <b><span style="color:#000000">malloc</span></b> <span style="color:#990000">(</span><b><span style="color:#0000FF">sizeof</span></b> <span style="color:#990000">(*</span>result<span style="color:#990000">));</span>
    <span style="color:#990000">*</span>result <span style="color:#990000">=</span> <span style="color:#FF0000">'</span><span style="color:#CC33CC">\0</span><span style="color:#FF0000">'</span><span style="color:#990000">;</span>
    <b><span style="color:#0000FF">while</span></b> <span style="color:#990000">(</span>i <span style="color:#990000">&lt;</span> argc<span style="color:#990000">)</span> <span style="color:#FF0000">{</span>  <i><span style="color:#9A1900">// while there are still arguments</span></i>
        <span style="color:#009900">char</span> <span style="color:#990000">*</span>s <span style="color:#990000">=</span> <span style="color:#990000">(</span><span style="color:#009900">char</span> <span style="color:#990000">*)</span> <b><span style="color:#000000">malloc</span></b> <span style="color:#990000">(</span><b><span style="color:#0000FF">sizeof</span></b> <span style="color:#990000">(*</span>s<span style="color:#990000">)</span> <span style="color:#990000">*</span>
                                   <span style="color:#990000">(</span><b><span style="color:#000000">strlen</span></b><span style="color:#990000">(</span>result<span style="color:#990000">)</span> <span style="color:#990000">+</span> <b><span style="color:#000000">strlen</span></b><span style="color:#990000">(</span>argv<span style="color:#990000">[</span>i<span style="color:#990000">])</span> <span style="color:#990000">+</span> <span style="color:#993399">1</span><span style="color:#990000">));</span>
        <b><span style="color:#000000">strcpy</span></b> <span style="color:#990000">(</span>s<span style="color:#990000">,</span> result<span style="color:#990000">);</span>
        <i><span style="color:#9A1900">// add "free(result); here...</span></i>
        <b><span style="color:#000000">strcat</span></b> <span style="color:#990000">(</span>s<span style="color:#990000">,</span> argv<span style="color:#990000">[</span>i<span style="color:#990000">]);</span>
        <i><span style="color:#9A1900">// ... or here</span></i>
        result <span style="color:#990000">=</span> s<span style="color:#990000">;</span>
        i<span style="color:#990000">++;</span>
    <span style="color:#FF0000">}</span>
    <b><span style="color:#000000">printf</span></b> <span style="color:#990000">(</span><span style="color:#FF0000">"Concatenation: %s</span><span style="color:#CC33CC">\n</span><span style="color:#FF0000">"</span><span style="color:#990000">,</span> result<span style="color:#990000">);</span>
    <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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