title: scanf error handling C
body: <p>Say If i want an input to be</p>
  
  <pre><code>[Name] [Name]
  </code></pre>
  
  <p>How would I detect </p>
  
  <pre><code>[Name] [Name] [Name] 
  </code></pre>
  
  <p>and return error?</p>
  
  <p>Here is what I have so far,</p>
  
  <pre><code>char in[20];
  char out[20];
  scanf(" %s %s", out, in);
  </code></pre>