How to set bitcoin reward less than 1 coin

Question

I've seen the line

LINE 831 int64 nSubsidy = 1 * COIN;

What if I want to set the reward less than 1 coin?

Answer 1

Coin is defined here: https://github.com/bitcoin/bitcoin/blob/master/src/amount.h#L16

static const CAmount COIN = 100000000;

So the amount is in satoshis.