a = 100;

b = 200;

switch(a)

   case 100

      fprintf('This is part of outer switch %d\n', a );

      switch(b)

         case 200

            fprintf('This is part of inner switch %d\n', a );

      end

end

​

fprintf('Exact value of a is : %d\n', a );

fprintf('Exact value of b is : %d\n', b );

​