% Case 1b : A subfunction calls a private function           case1b.m
function case1b
  fprintf('case1b to ...........call   case1b_sub\n');
  y=case1b_sub;
end
function y=case1b_sub
  fprintf('case1b_sub to........call   p\n');
  y=p;
  y=['Case 1b: ' y ' called by subfunction case1b_sub'];
  fprintf('%s\n',y);
end
