Tool Command language (Tcl) .. First lecture ( variable declaration )

Variable Declaration 

  In c prog language  when we  declare some variable , we write 
  int x = 3;

  But in Tcl we write
  set x 3;
         "here it is stored as string"
  No need to declare just assign a value to variable. This  statement     will create a variable name x and store it as string.
          Now if we write
puts [expr $x + 5] #  we can also use (put)
      here x is automatically converted into int.
 Now to print x we will write


puts $x .. Answer will be 8 ( as expr above does addition operation)