实验2

#include<iostream>
using namespace std;
struct Complex{
    double real;
    double imaginary;
}; 
int add(int a,int b);
double add(double c,double d);
Complex add(Complex e,Complex f);
int main(){
    int a,b;
    cout<<"请输入两个整型数字"<<endl;
    cin>>a>>b;
    double c,d;
    cout<<"请输入两个double型数字"<<endl;
    cin>>c>>d;
    Complex e,f;
    cout<<"请输入两个complex型数字"<<endl;
    cin>>e.real>>e.imaginary>>f.real>>f.imaginary;
    add(a,b);
    add(c,d);
    add(e,f);
    return 0;
    
}
int add(int a,int b) 
{
    cout<<a+b<<endl;
}
double add(double c,double d)
{
    cout<<c+d<<endl;
}
Complex add(Complex e,Complex f)
{
    cout<<e.real+f.real<<"+"<<e.imaginary+f.imaginary<<"i"<<endl;
}

#include <iostream>
#include "标头.h"
using namespace std;
int main() {
    int i;
    int a[5] = { 20,12,36,54,82 };
    double b[5] = { 3.6,2.1,5.1,11.1,12.1 };
    quick(a, 0, 5);
    quick(b, 0, 5);
    for (i = 0; i < 5; i++)
        cout << " " << a[i];
    cout << endl;
    for (i = 0; i < 5; i++)
        cout <<" "<< b[i];
    system("pause");
    return 0;
}

#ifndef Quicksort
#define Quicksort
template <class T>
void quick(T s[], int low, int high) {
    int a, b, c = 0;
    T e, f;
    a = low; b = high - 1; e = s[(low + high) / 2];
    if (a < b) {
        while (a < b) {
            while (a < b&&e < s[b])
                b--;
            while (a < b&&e > s[a])
                a++;
            if (a >= b) c = b;
            else { f = s[a]; s[a] = s[b]; s[b] = f; }
        }
        quick(s, low, c);
        quick(s, c + 1, high);
    }
}
#endif

#include<iostream>
#include<string>
using namespace std;

class User {
public:
    void setInfo(string name0,string passwd0 = "111111", string email0 = " ");
    void changePasswd();                                       
    void printInfo();                                          
    void changemail();                                         
private:
    string name;
    string passwd;
    string email;
};
void User::setInfo(string name0, string passwd0, string email0) {
    name = name0;
    passwd = passwd0;
    email = email0;
}

void User::changePasswd() {
    string passwd1, passwdN;
    int n=1;
    cout << "输入旧密码:";
    cin >> passwd1;
    while (n <= 3) {
        if (User::passwd == passwd1) {
            cout << "输入新密码:";
            cin >> passwdN;
            break;
        }
        else if(n<3&&(User::passwd != passwd1)) {
            cout << "输入错误，请再试一遍:";
            cin >> passwd1;
            n++;
        }
        else if (n == 3 && (User::passwd != passwd1)) {
            cout << "请稍后再试." << endl;
            break;
        }
    }
}

void User::printInfo() {
    cout << "name:\t\t" << name << endl;
    cout << "passwd:\t\t" <<"******"<< endl;
    cout << "email:\t\t" << email << endl;
}

void User::changemail() {
    string emailN;
    char a = ‘@‘;
    string::size_type idx;        
    cout << "Enter the new email:";
    cin >> emailN;
    idx = emailN.find(a);         
    while (idx == string::npos) { 
        cout << "Add @ to your email:";
        cin >> emailN;
        idx = emailN.find(a);
    }

}

int main() {
    cout << "testing 1......" << endl << endl;

    User user1;
    user1.setInfo("Leonard");
    user1.printInfo();
    user1.changePasswd();
    user1.printInfo();

    cout << endl << "testing 2......" << endl << endl;
    User user2;
    user2.setInfo("Jonny", "92197", "xyz@hotmail.com");
    user2.printInfo();
    user2.changemail();

    system("pause");
    return 0;
}