how to use default values of variables when data get varied

Hi Expert,

I want to use default value of variables var1.

for eg. if variable length is 20 char and value is abc , then i want to fill var1 by default 20 ( after printing abc value remaining length i.e.17 should be taken by var1 means total length 20 should be occupy by var1.)

plz reply

Regards,

Jyotsna