信用卡.cpp

实现银行信用卡功能

#include<iostream.h>
struct kar
{
	int id;
	int password;
	double nummoney;
	kar*next;
};
kar * head=NULL;
kar* pm=NULL;
kar* pe=NULL;
kar* f=NULL;
int id,password;
void found(int id);
kar* createid()
{
	pe=new kar;
	while(pe==NULL)
	{
       pe=new kar;
	}
		cout<<"请设置你的号码和密码："<<endl;
		cin>>id>>password;
		pe->id=id;
		pe->password=password;
		pe->nummoney=0;
		if(head==NULL)
		{
		  head=pe;
		  f=head;
		  pm=pe;
		}
		else
		{
			pm->next=pe;
			pm=pe;
		}
	 pe->next=NULL;
	 found(id);
		return head;
}
void found(int id)
{
	 f=head;
	 while(f!=NULL&&f->id!=id)
		f=f->next;
	 if(f!=NULL) 
		;
  	else
		cout<<"此卡号不存在"<<endl;
}
bool checkpassword(int id,int password)
{
	found(id);
	if(f->password==password)
	    return 1;
	else 
       return 0;
}
double getmoney()
{	
     return f->nummoney;	
}
double savemoney(int num)
{
	
		f->nummoney=f->nummoney+num;
		return f->nummoney;
}
double takemoney(int num)
{
	f->nummoney=f->nummoney-num;
 		if(f->nummoney>=0)
		   cout<<"你现有余额为:"<<f->nummoney<<endl;
		  else
			  cout<<"你的余额不足"<<endl;
		return f->nummoney;
}
void setpassword(int newpassword)
{  
		f->password=newpassword;
}
void changemoney(int idg,int num)
{
  	f->nummoney=f->nummoney-num;
    if(f->nummoney>=0)
		cout<<" 你现有余额不够"<<endl;
	found(idg);
		if(f!=NULL)	
			f->nummoney=f->nummoney+num;
			else
				cout<<"收款帐号不存在"<<endl;
}
void main()
{
	int n=0,num=0;
	bool ft=false;
	createid();
	cout<<"请输入帐号和密码"<<endl;
	cin>>id>>password;
  //  ft=checkpassword(id,password);
    do
	{
		 ft=checkpassword(id,password);
		if(ft)
		{
		 cout<<"申请账号---1；修改密码----2；查询账号---3；"
			 <<endl<<"取款——4; 存款----5；转帐--6；定位---7;退出--8"<<endl;
			 cin>>n;
		 switch(n)
		 {
		 case 1:createid();break;
		 case 2:cout<<"请输入新密码";
					cin>>password;
			  setpassword(password);break;
		 case 3: cout<<"你现有余额为:"<<getmoney()<<endl;break;
		 case 4:cout<<"请输入数目";
			    cin>>num;
			    takemoney(num);break;
		 case 5:cout<<"请输入数目";
			    cin>>num;
			 savemoney(num);break;
		 case 6: 
			 cout<<"请输入对方的帐号t和数目"<<endl;
			 cin>>id>>num;
			 changemoney(id,num);break;
		 case 7:cout<<" 请输入帐号和密码:"<<endl;
			 cin>>id>>password;
			 found(id);
			 break;
		 case 8:break;
		default:cout<<"你输入不符要求的数字"<<endl;
		 }
		}
		else
		{
		 cout<<"  你的帐号和密码不对,请重试"<<endl;
		 cin>>id>>password;
		}	
	}while(n!=8);
	cout<<"伍东方"<<endl;
    delete pe;
}