WHILE STATEMENT

while(expr) statement;

While 'expr' evaluates to non 0, execute statement.

A 'break' in the 'statement' will terminate the loop. A 'continue' will
continue the execution from the beginning of the loop.

example:

   i = 0;
   while ( i < 10 ) {
     write( i+" ");
     i += 1;
   }

Would give the following output:

0 1 2 3 4 5 6 7 8 9 
