int Order::removeCakeByCakeNo(int a)
{
    for(int i=0;i<5;i++)//traverse array
    {

        if(orderStatus==false)//if order not completed/not paid
        {
            if(listOfCakes[i]!=NULL)//if array is not empty
            {
                if(listOfCakes[i]->getCakeNumber()==a)//if cake number = cake number provided by user
                {
                listOfCakes[i]=NULL;//store cake into order array
                //orderTotal = orderTotal + c->getCakeCost();//orderTotal initialised as 0.0, thus, need 0.0 + $cost of cake to get order total

                return 1;
                }

            }



        }

    }
    return -1;
}