C++实验求助

这个容易，加点分就给你。。。

1,
#Include <iostream>
using namespace std;
class Account
{
protected:
double m_balance;
public:
Account(double m)
{
if(m<=0)
{
m_balance = 0.0;
cout<<"初始值无效"<<endl;
}
else
m_balance = m;
}
void credit(double m)
{
m_balance = m_balance + m;
}
void debit(double m)
{
if(m>m_balance)
cout<<"Debit amount exceed account balance."<<endl;
else
m_balance = m_balance - m;
}
double getBalance()
{ return m_balance; }
};
class SavingAccount : public Account
{
double m_lixi;
public:
SavingAccount(double m, double lixi) : Account(m),m_lixi(lixi){}
double calculateInterest()
{
return m_balance*(1+m_lixi);
}
};
class CheckingAccount : public Account
{
double