Section 234C

If there is capital gain then section 234C doesn't apply.
But my doubt is that if with capital gain we have other head's income as well which are salary and interest income then also 234C or 234B should not apply on portion of tax calculated on capital gain.
But as i am calculating Income tax then 234C section's interest is being calculating on whole income doesn't matter capital gain or other head's.
So why????? please resolve asap.