c++第二次实验作业

（1）user类的用法

#include<iostream> 
#include<string>
#include <conio.h> 
#include <algorithm>
using namespace std;

class User{
    public:
        User(string name,string email="",string passwd="111111" ):name(name),email(email),passwd(passwd){};
        void emailcin();                            //输入邮箱 
        void changePasswd();                       
        void printInfo();
        int checkemail();                           //检查邮箱是否含有@ 
    private:
        string name;
        string passwd;
        string email;
};                                                  //user类的定义 


int main() {
    
    cout << "testing 1......" << endl;
    User user1("Leonard","178392qq.com");
    user1.printInfo();
    do{
    int defact;        
    defact=user1.checkemail();                  
    if(defact)
        {
        cout<<"please enter your email again:";
        user1.emailcin();
        }
    else 
        break;
    }while(1);                                    //判断是否含@ 
       user1.printInfo();
    user1.changePasswd();
    cout<<endl;
    user1.printInfo();
    cout<<endl;
    
    cout << endl << "testing 2......" << endl ;
    User user2("Jonny","92197","[e-mail]");
    user2.printInfo();
    return 0;
}


void User::changePasswd(){
    string past;
    char ch; 
    int i=1,k;
    cout<<"please enter the past passwd:";
    while(i++<=3){
        for(k=1;k<=6;k++){
        ch=getch();
        cout<<"*";
        past=past+ch;
    }
        if(past==passwd)
        break;
        else
        cout<<endl<<"please enter the past passwd:";
    }
    if(i<=3){
        cout<<endl<<"now please enter the new passwd:";
        char a[7];
        passwd='\0';
        for(int k=1;k<=6;k++){
            a[k]=getch();
            passwd=passwd+a[k];
            cout<<"*";
            }
    }    
    else
        cout<<"please do it later"<<endl;
}


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

    int User::checkemail(){
        string c="@";
    string::size_type chec;
    chec=email.find(c);
    if(chec==string::npos)    
    return 1;
    return 0;
}

void User::emailcin(){
    cin>>email;
} 

（2）快速排序

#include <iostream>
#include"Quick.h"
#include"output.h"
/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) {
    int a[8]={77,77,88,88,668,88,0,77};
    QuickSort(a,8);
    output(a,8);
    return 0;
} 

#define OUTPUT_H

template<class T>
void output(T a[],int n){
    for(int i=0;i<n;i++)
        std::cout<<a[i]<<" ";
} 

#define Quick

template<class T>
void swap(T&a,T&b);

template<class T>
void Qsort(T a[],int,int);

template<class T>
void QuickSort(T a[],int n){
    Qsort(a,0,n-1);
}

template<class T>
void Qsort(T a[],int low,int high){
    T temp=a[low];
    int x1=low,x2=high;
    while(low!=high){
        while(temp<=a[high]&&low<high)
        high--;
        if(high==low)
        break;
        a[low]=a[high];
        while(temp>=a[low]&&low<high)
        low++;
        if(high==low)
        break;
        a[high]=a[low];
    }
    a[low]=temp;
    if(low-x1>=3)
    Qsort(a,x1,low-1);
    else 
    if(a[x1+1]>a[low+1])
    swap(a[x1],a[low-1]);
    
    if(x2-low>=3)
    Qsort(a,low+1,x2);
    else 
    if(a[low+1]>a[x2])
    swap(a[low+1],a[x2]);
}

template<class T>
void swap(T&a,T&b){
    int temp=a;
    a=b;
    b=temp;
}

 

 

 

 

（3）重载函数实现相加

#include<iostream>
using namespace std;

struct Complex{
    double real;
    double imaginary;
};

int add(int,int);
double add(double,double);
Complex add(Complex,Complex);

int main(){
    Complex a={2.2,3.3};
    Complex b={4.4,7.8};
    Complex c=add(a,b);
    
    cout<<add(3,4)<<endl;
    cout<<add(5.5,6.6)<<endl;
    cout<<c.real<<"+"<<c.imaginary<<"i"<<endl;
    
    return 0;
}

int add(int a,int b){
    return a+b;
}

double add(double a,double b){
    return a+b;
}

Complex add(Complex a,Complex b){
    Complex c;
    c.real=a.real+b.real;
    c.imaginary=a.imaginary+b.imaginary;
    return c;
}

总结：在这次实验完成过程中，通过不断修改，查找函数用法，掌握了很多。我觉得这次最大的收获就是学会了创建项目，因为以前一直困惑怎么将一个像sale那种已经编好的代码放在同一个文件夹下。