求更改下小弟我写的程序与一些有关问题

求更改下我写的程序与一些问题
#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
using namespace std;
#include <string.h>
#include <conio.h>
#include<stdio.h>
fstream iofile;
struct Node
{
string Name; //姓名
double BasicWage;//基本工资
double Reward; //奖金
double Forfeit; //罚款
Node *next;
};
class A
{
private:
Node *head;
public:
A(Node *h)
{
head=h;
}
~A()
{
}
Node * Create();
void Release();
Node *Insert();
void seek();
Node * Change();
void menu();
void count();
void File(fstream & ofile);
};
Node * A::Create() 
{ 
head=(Node *)new Node; 
if(!head) 
{ 
cout<<"分配内存失败！"<<endl; 
return NULL; 
} 
head->Name=" "; 
head->BasicWage=0; 
head->Reward=0; 
head->Forfeit=0;  
head->next=NULL; 
return head; 
}
//释放链表
void A::Release() 
{ 
Node * ptr; //声明一个操作用的指针。 
while(head!=NULL) 
{ 
ptr=head; 
head=head->next; 
delete ptr; //释放节点资源。 
} 
} 
void print(Node * ptr)
{
cout<<"姓名："<<ptr->Name<<endl;
cout<<"基本工资："<<ptr->BasicWage<<endl;
cout<<"奖金："<<ptr->Reward<<endl;
cout<<"罚款："<<ptr->Forfeit<<endl;
cout<<"总和："<<ptr->BasicWage+ptr->Reward-ptr->Forfeit<<endl;
}
Node * A::Insert() 
{
Node *pNew; //声明一个新节点 
char again; 
string Cname;
double CbasicWage,Creward,Cforfeit;
do 
{ 
pNew=(Node *)new Node;
cout<<"请输入姓名："; 
cin>>Cname; 
cout<<endl<<"请输入基本工资："; 
cin>>CbasicWage; 
cout<<endl<<"请输入奖金："; 
cin>>Creward;
cout<<endl<<"请输入罚款数："; 
cin>>Cforfeit;  
cout<<endl; 
pNew->Name=Cname; 
pNew->BasicWage=CbasicWage; 
pNew->Reward=Creward; 
pNew->Forfeit=Cforfeit;  
pNew->next=head->next; 
head->next=pNew; 
cout<<"数据添加成功！是否继续添加？(Y/N)"<<endl; 
cin>>again; 
}while(again=='Y'||again=='y'); 
return head; 
} 
void A::File(fstream & ofile) 
{ 
Node * pNode; 
pNode=head->next; 
ofile.clear(); //清除文件结束状态。 
while(pNode) 
{ 
ofile<<setw(10)<<left<<"姓名"<<setw(10)<<left<<"基本工资"<<setw(10)<<left<<"奖金"<<setw(10)<<left<<"罚单"<<setw(10)<<left<<"应付工资"<<endl;
ofile<<setw(10)<<left<<pNode->Name 
<<setw(10)<<left<<pNode->BasicWage
<<setw(10)<<left<<pNode->Reward
<<setw(10)<<left<<pNode->Forfeit
<<setw(10)<<left<<pNode->BasicWage+pNode->Reward-pNode->Forfeit
<<endl; 
pNode=pNode->next; 
} 
cout<<"数据文件保存成功！"<<endl;
} 
void main()
{
Node *head=0;
A a(head);
head=a.Create();
iofile.open("E:工资.xls",ios_base::in|ios_base::out|ios_base::app);
if(!iofile)