title: Use of wire inside an always block?
body: <p>Can I use a wire inside an always block?
      Like for example: </p>
  
  <pre><code>        wire [3:0]a;
          assign a=3;
  
          always @(c)
             begin
                  d=a+c;
             end
  </code></pre>
  
  <p>It got compiled without throwing any error. Why?</p>