left shift or right shift operator usage example please

[6839470]

I need an example code for left or right shift operator.
anyone ?/..
like
for (j=7; j>=0, j--) {
if ( (1 << j) &rew_y)
{
puts "done"
}
}

equivalent thing in tcl??

 

[ulis]

Tcl uses the same expressions as C but needs a expr command if the expression is ouside a if command.

  set rew_y 7
  for {set j 7} {j >= 0} {incr j -1}   {
    if ( (1 << j) & rew_y(i) )     { 
      puts "done"
    } 
  }

(not tested)

More on the Tcl expressions at:

http://mini.net/tcl/expr

HTH

ulis