按位查找

Customer GetCustomer(CustomerList customerList, int i){
    return customerList.CList[i-1];
}

按值查找

bool CustomerEqual(Customer customer, Customer customer1){
    if((customer.num == customer1.num)&&(customer.numberOfPeople == customer1.numberOfPeople)){
        return true;
    }
    return false;
}
int LocateCustomer(CustomerList customerList, Customer customer){
    for (int i = 0; i < customerList.length; i++) {
        if(CustomerEqual(customer, customerList.CList[i])){
            return i+1;
        }
    }
    return 0;
}