Calculate broadcast address from ip and subnet mask

Question

I want to calculate the broadcast address for:

IP:     192.168.3.1
Subnet: 255.255.255.0
=       192.168.3.255

in C.

I know the way

Answer 1

Could it be?

unsigned broadcast(unsigned ip,unsigned subnet){
    unsigned int bits = subnet ^ 0xffffffff; 
    unsigned int bcast = ip | bits;

    return bcast;
}

Edit: I considered that both ip and subnet are without "."