实验二

#include<iostream>
using namespace std;
struct Complex
{
    double real;
    double imaginary;
};
int add(int x,int y)
{
    int s;
    s=x+y;
    cout<<s<<endl;
    return 0;
}
double add(double x,double y)
{
    double s=x+y;
    cout<<s<<endl;
    return 0;
    
}
Complex add(Complex x,Complex y)
{
    Complex s;
    s.real=x.real+y.real;
    s.imaginary=x.imaginary+y.imaginary;
    cout<<s.real<<"+"<<s.imaginary<<"i"<<endl;
    return s;
}
int main ()
{
    int a,b;
    double c,d;
    Complex m,n;
    cin>>a>>b;
    add(a,b);
    cin>>c>>d;
    add(c,d);
    cin>>m.real;
    cin>>m.imaginary;
    cin>>n.real;
    cin>>n.imaginary;
    add(m,n);
    return 0;
}

#include<iostream>
using namespace std;
template <typename T>
void Swap(T &x,T &y)
{
    T m;
    m=x;
    x=y;
    y=m;
}
template <typename T>
void QuickSort(T a[],int low,int high)
{
    int i=low;
    int j=high;
    int key=a[low];
    if (low>=high)
    {
        return ;
    }
    while (low<high)
    {
        while (low<high&&a[high]>=key)
        {
            high--;
        }
        if (a[high]<key)
        {
            Swap(a[low],a[high]);
            low++;
        }
        while (low<high&&a[low]<=key)
        {
            low++;
        }
        if (a[low]>key)
        {
            Swap(a[low],a[high]);
            high--;
        }
    }
    QuickSort(a,i,low-1);
    QuickSort(a,low+1,j);
 } 
int main ()
{
    int  a[]={9,2,-58,34,5,76,9,1,56,2500};
    double b[]={2.3,45.3,1.3,4,53,13,3.2,9,48.6,10};
    QuickSort(a,0,9);
    QuickSort(b,0,9);
    for (int i=0;i<10;i++)
    {
        cout<<a[i]<<" ";
    }
    cout<<endl;
    for (int i=0;i<10;i++)
    {
        cout<<b[i]<<" ";
    }
    cout<<endl;
    return 0;
} 

#include<iostream>
#include<String>
using namespace std;
class User
{
    public:
        User (string name,string password,string email)
        {
            username=name;
            userpassword=password;
            useremail=email;
        }
        void setinfo (string name,string password,string email)
        {
            username=name;
            userpassword=password;
            useremail=email;
        }
        void printinfo()
        {
            cout<<username<<"\t"<<"******"<<"\t"<<useremail<<endl;
        }
        void changepassword()
        {
            int i;
            for (i=0;i<3;i++)
            {
                cout<<"please enter the old password:"<<endl;
                cin>>enterpassword;
                if (enterpassword==userpassword)
                   break;
                else
                   continue;
             }
             if (i!=3)
             {
                 cout<<"please enter the newpassword"<<endl;
                 cin>>usernewpassword;
                 setinfo(username,usernewpassword,useremail);
             }
            else
            {
                cout<<"please try later"<<endl;
                exit(0);
            }
                
        }
    private:
        string username,useremail;
        string userpassword,usernewpassword;
        string enterpassword;
};
int main ()
{
    User myuse("","111111","");
    myuse.setinfo("libing","072921","2030950866@qq.com");
    myuse.printinfo();
    myuse.changepassword();
    cout<<"the user after change:"<<endl;
    myuse.printinfo();
    return 0;
}