C++贷款类（等额本金，等额本息）

懂的都懂：
三个头文件
三个cpp文件
一个报错类
一个主函数cpp文件

贷款类
DaiKuan.h

#pragma once

#include
#include
#include
#include
#include
#include
#include
using namespace std;
class DaiKuan
{
public:
	DaiKuan();
	DaiKuan(double xdaiKuanZongE,double xnianLiLv=0,int xhuanKuanYueShu=0);
	void init(double xdaiKuanZongE, double xnianLiLv = 0, int xhuanKuanYueShu = 0);
	virtual void compute() = 0;
	virtual void print() = 0;

	virtual ostream& tostream(ostream& out, DaiKuan *d)=0;
	virtual ostream& operator