银行管理系统

来源：互联网发布：乐视max2root软件编辑：程序博客网时间：2024/06/10 21:21

#include <iostream>#include <string>#include <assert.h>#include <climits>using namespace std;class Accout{protected:    string name;    double money;    string ID;    string Phone;public:    Accout(string name,           double money=0,           string ID="000",           string Phone="000"):name(name),money(money),ID(ID),Phone(Phone){}    string getname()const{return this->name;}    virtual bool savemoney ()=0;    virtual bool getoutmoney()=0;    virtual bool showAccoutInfo()=0;    Accout *next;};class Normal:public Accout{public:    Normal(string name,           double money,           string ID,           string Phone):Accout(name,money,ID,Phone){}    virtual bool savemoney ();    virtual bool getoutmoney();    virtual bool showAccoutInfo();};bool Normal::savemoney(){    double m;    cout<<"请输入存款金额"<<endl;    cin>>m;    this->money+=m;    return true;}bool Normal::getoutmoney(){    double m;    cout<<"请输入取款金额"<<endl;    cin>>m;    if (m>money) {        cout<<"您的余额不足"<<endl;    }    else        this->money-=m;    return true;}bool Normal::showAccoutInfo(){    cout<<this->name<<" "<<this->money<<" "<<this->ID<<" "<<this->Phone<<endl;    return true;}class Vip:public Accout{public:    Vip(string name,        double money,        string ID,        string Phone):Accout(name,money,ID,Phone){}    virtual bool savemoney ();    virtual bool getoutmoney();    virtual bool showAccoutInfo();private:    double already=0;    double left=5000;};bool Vip::savemoney(){    double m;    cout<<"请输入存款金额"<<endl;    cin>>m;    this->money+=m;    return true;}bool Vip::getoutmoney(){    double m;    cout<<"请输入取款金额"<<endl;    cin>>m;    if (m>this->money) {        this->money=0;        already=m-this->money;        left=left-already;        cout<<"您的余额不足，透支金额为:"<<already<<endl;        cout<<"可透支的额度为:"<<left<<endl;    }    return true;}bool Vip::showAccoutInfo(){    cout<<name<<endl<<money<<endl<<ID<<endl<<Phone<<endl<<left<<endl<<already<<endl;    return true;}class Bank{public:    Bank():head(NULL){}    bool append();    bool deleteUser(const string &name);    void view()const;    Accout* find(const string &name) const;private:    Accout *head;};bool Bank::append()//创建链表{    Accout *mid;    char a;    string name,ID,Phone;    double money;    cout<<"需要办理VIP请按0，需要办理普通用户请按1"<<endl;    cin>>a;    cout<<"请输入用户名 存入金额 身份证号和手机号码"<<endl;    cin>>name>>money>>ID>>Phone;    if (this->head==NULL)    {        if (a=='1')        {            head=new Normal(name,money,ID,Phone);            head->next=NULL;        }        else        {            head=new Vip(name,money,ID,Phone);            head->next=NULL;        }    }    else    {        mid=head;        while (mid!=NULL) {            mid=mid->next;            //移动指针至表尾        }        if(a=='1')        {            mid=new Normal(name,money,ID,Phone);            mid->next=NULL;        }        else        {            mid=new Vip(name,money,ID,Phone);            mid->next=NULL;        }    }    return true;}Accout* Bank::find(const string&name1) const//查找节点{    Accout *mid;    mid=head;    while (mid->getname()!=name1&&mid!=NULL) {        mid=mid->next;    }    if(mid==NULL)        cout<<"没有找到该用户，请检查用户名是否填写正确"<<endl;    assert(mid!=NULL);    return mid;}bool Bank::deleteUser(const string& name2)//删除节点{    Accout *mid;    mid=head;    if (head->getname()==name2) {        head=head->next;        delete mid;        mid=NULL;    }    else    {        while (mid->next!=find(name2)) {            mid=mid->next;        }        mid->next=find(name2)->next;        delete find(name2);        mid=find(name2);        mid=NULL;    }    return true;}void Bank::view()const//遍历链表{    Accout *mid;    mid=head;    while (mid!=NULL) {        mid->showAccoutInfo();        mid=mid->next;    }}int main(){    char b;    Bank bank;    string user;    while (1) {        cout<<"创建账户请按1"<<endl;        cout<<"存款请按2"<<endl<<"取款请按3"<<endl<<"查看用户信息请按4"<<endl<<"查看所有用户信息请按5"<<endl<<"销户请按6"<<endl;        cin>>b;        //cin.ignore(numeric_limits::max());        switch (b) {            case '1':                bank.append();                break;            case '2':                cout<<"请输入用户名"<<endl;                cin>>user;                bank.find(user)->savemoney();                break;            case '3':                cout<<"请输入用户名"<<endl;                cin>>user;                bank.find(user)->getoutmoney();                break;            case '4':                cout<<"请输入用户名"<<endl;                cin>>user;                bank.find(user)->showAccoutInfo();                break;            case '5':                bank.view();                break;            case '6':                cout<<"请输入用户名"<<endl;                cin>>user;                bank.deleteUser(user);;                break;            default:                break;        }    }    return 0;}

对抽象类的认识不够。只能用于被继承而不能直接创建对象的类设置为抽象类（Abstract Class）。之所以要存在抽象类，最主要是因为它具有不确定因素。我们把那些类中的确存在，但是在父类中无法确定具体实现的成员函数称为纯虚函数。纯虚函数是一种特殊的虚函数，它只有声明，没有具体的定义。抽象类中至少存在一个纯虚函数；存在纯虚函数的类一定是抽象类。存在纯虚函数是成为抽象类的充要条件。

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