title: For loop with two variables in TCL
body: <p>I want to transform the following c code to TCL.</p>
  
  <pre><code>int a[10],b[10];
  int n=20
  
  for (i=1,j=1; i&lt;=n; i+=2,j++)
  {
    b[j]=a[i];
  }
  </code></pre>
  
  <p>I need to change this for loop to TCL, I don't want to use the foreach feature in TCL...
  Does TCL for loop structure allow two loop variables??? </p>