实验2

#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()
{int a,b;
 cout<<"输入两个整数:"; 
 cin>>a>>b;
 cout<<add(a,b)<<endl;
 double c,d;
 cout<<"输入两个double型的数:";
 cin>>c>>d;
 cout<<add(c,d)<<endl;
complex g,e,f; 
cout<<"输入两个complex型的数:";
 cin>>e.real>>e.imaginary>>f.real>>f.imaginary; 
 g=add(e,f);
 cout<<g.real<<"+"<<g.imaginary<<"i"<<endl;
 return 0;
}

#include <iostream>
using namespace std;
template<class T>
void Quicksort(T a[],int m,int n)
{    int i=m, j=n-1;
      T t=a[i];
     if(i<j)
     {while(i<j)
           { while(i<j&&a[j]>=t)
               j--;
           if(i<j)
             {a[i]=a[j];i++;}
          while(i<j&&t>a[i])
            i++;
          if(i<j){a[j]=a[i];j--;}
        }
    a[i]=t;
    Quicksort(a,m,i);
    Quicksort(a,i+1,n);
    }
} 

int main()
{     int i;
    int a[5]={11,33,55,22,31};
    cout<<"a[5]={11,33,55,22,31}"<<endl;
    Quicksort(a,0,5);
    cout<<"按升序排序为："; 
    for(i=0;i<5;i++)
        cout<<a[i]<<"  "; 
    cout<<endl;
    double b[5]={1.9,1.7,3.4,4.3,2.1};
    cout<<"b[5]={1.9,1.7,3.4,4.3,2.1}"<<endl;
    Quicksort(b,0,5);
    cout<<"按升序排序为："; 
    for(i=0;i<5;i++)
        cout<<b[i]<<"  "; 
    cout<<endl;
    return 0;
} 

#include<iostream>
#include<string>
using namespace std;
class User{
    public:
        void setInfo(string name0,string passwd0="111111",string email0=" ");
        void changePasswd();
        void printInfo();
    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 passwd;
  int i=0;
  cout<<"请输入旧密码："<<endl;
  cin>>passwd;
  while(passwd!="111111"&&i<3) 
  {i++;
  cout<<"输入错误，请重新输一遍："<<endl;
  cin>>passwd;
  }
  if(passwd=="111111")
  {cout<<"请输入你的新密码："<<endl;
  cin>>passwd;
  cout<<"修改密码成功"<<endl; 
  }
  else if(i==3)
  cout<<"请稍后再试"<<endl; 
}
void User::printInfo (){
    cout<<"name: "<<name<<endl;
    cout<<"password: "<<"******"<<endl;
    cout<<"email: "<<email<<endl;
}
int main()
{ cout<<"testing 1......"<<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();
  return 0;
}