title: basic Tcl -- printing a value of variable
body: <p>I have the following script in Tcl:</p>
  
  <pre><code>set val(a) 10
  set val(b) 10
  set val(n) expr{$val(a) * $val(b)}
  </code></pre>
  
  <p>How to print the value of the variable n?</p>
  
  <pre><code>puts $val(n)
  </code></pre>
  
  <p>gives  <code>expr{10*10}</code>  and i need to see 100.... </p>