package main

import "fmt"

type iPacket interface {
    GetCommand() int;
    Check() bool;
    Add();
    Divide();
}

type Packet struct {
    Command int;
    Sum int;
}

func (p *Packet) GetCommand() int {
    return p.Command;
}

func (p *Packet) Check() bool {
    return true;
}

func (p *Packet) Add() {
    //STUB
}

func (p *Packet) Divide() {
    //STUB
}

type DummyPacket struct {
    Packet;
    HalfA int;
    HalfB int;
}

func (p *DummyPacket) Add() {
    p.Sum = p.HalfA + p.HalfB;
}

func (p *DummyPacket) Divide() {
    p.HalfA = p.Sum / 2;
    p.HalfB = p.Sum / 2;
}

func HandleDummy(p DummyPacket) {
    fmt.Printf("DummySum: %d",p.Sum);
}

func main() {
    var pOrigin Packet;
    pOrigin.Command = 1;
    pOrigin.Sum = 10;
    var pInterface iPacket;
    pInterface = pOrigin;
    if(pInterface.GetCommand()==1) {
        pDestination := pInterface.(DummyPacket);
        pDestination.Divide();
        HandleDummy(pDestination);
    }
}