title: How to debug using gdb?
body: <p>I am trying to add a breakpoint in my program using</p>
  
  <pre><code>b {line number}
  </code></pre>
  
  <p>but I am always getting an error that says:</p>
  
  <pre><code>No symbol table is loaded.  Use the "file" command.
  </code></pre>
  
  <p>What should I do?</p>