title: linking two C Programs
body: <p>I'm combining two C programs using a header file.</p>
  
  <p>first program </p>
  
  <pre><code>#include&lt;explore.h&gt;
  
  int main()
  {
      int a =10;
      explore();
  }
  </code></pre>
  
  <p>explore program</p>
  
  <pre><code>#include&lt;stdio.h&gt; 
  
  int explore()
  {
      // I want to use the value of a. Can I use it? How can sue it?
  }
  </code></pre>
  
  <p>I want to use the value of <code>a</code> in <code>explore()</code> in explore program file. </p>
  
  <p>Can I use it? How can use it, is possible?</p>