logic for checking what is the input data

can any one help me开发者_开发百科 in this logic, when i enter a source ip is should call a particular function XXX()if i enter destination ip or destination port or source port it should call a different function say YYY(), my doubt is how can i recognise whether the input address is source ip address or destination address

---

With assumption that you are referring to Command Line Arguments. You should have options to your program. For example :

program_name --source-ip <source ip> --source-port <source-port> --destination-ip <destination-ip> --destination-port <destination-port>

You should then parse those and call the functions accordingly.