title: What will be the result of atoi(argv[1])?
body: <p>I just want to know what these lines actually do.</p>
  
  <pre><code>int main(int argc, char *argv[])
  </code></pre>
  
  <p>And especially this one:</p>
  
  <pre><code>int n = atoi (argv[1]);
  </code></pre>
  
  <p>I read this in a book but I cannot understand these lines.</p>