Number of rows updated

I have a block of statements like the following. The last statement in the block is an update statement. I was wondering if there is a way to get the number of rows updated by that statement. An easy way would be to wrap the whole thing in a function but, the code is not mine and it is difficult to change "legacy" code with the current managers:

DECLARE var_a number;

       var_b number;
BEGIN

      a bunch of sql statement go here;
      update emp_table set bonus = new_rate where dept_num = 'abc';