title: Using "If Statements" in basic C programming. How can I properly format them?
body: <p>To begin, the code that I have got up to this point is below.</p>
  
  <p>The calculator does everything I want it to, minus the fact that it still includes negative numbers in its calculations. I would like for it to do nothing if the number presented as the radius is less than zero, yet still calculate if the number is non-negative. However, I am having issues with using an if statement. I have not used these before, as I am really just a beginner. I just need a push in the right direction. Do I need to have an "else"? Any help is greatly appreciated!</p>
  
  <pre><code>#include &lt;stdio.h&gt;
  
  int radius, area;
  
  main()
  {
      printf("Enter radius: ");
      scanf("%d", &amp;radius);
      {
      if (&amp;radius &gt; -1);  {
           area = (int)(3.14159 * radius * radius);
           printf("Area = %d\n", area);}
      else {
         return(0); }
      }
     return(0);
  }
  </code></pre>