Change values in Workarea

Hello Friends,

I have a work area e.x (wa_tab1) and in this i have 100 fields and most of these fields are filled with values 'X'.

Now if i want to change all the work area (wa_tab1) fields which are filled with value 'X' how can i make it simple.

e.x if wa_tab1-field1 = 'X'.

      wa_tab1-field1 = 'Y'.

     endif.

The above statement shows the method of changing the single field value , if i want to repeat this for 100 fields how can i make it simple.

Regards,

Vinodkumar.