c++实验二

1.函数重载编程练习编写重载函数add()，实现对int型，double型，Complex型数据的加法

#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 x;
    double y;
    complex z;
    int a,b;
    cout<<"请输入两个整数:"<<endl;
    cin>>a>>b;
    x=add(a,b);
    cout<<"整数之和为："<<x<<endl;
    double c,d;
    cout<<"请输入两个double型数:"<<endl;
    cin>>c>>d;
    y=add(c,d);
    cout<<"double类型之和为："<<y<<endl;
    complex e,f;
    cout<<"请输入两个复数的实部虚部"<<endl;
    cin>>e.real>>e.imaginary>>f.real>>f.imaginary;
    z=add(e,f);
    cout<<"复数之和为："<<z.real<<"+"<<z.imaginary<<"i"<<endl;
    return ;
}
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;
}

2.编写实现快速排序函数模板，并在main()函数中，定义不同类型数据，调用测试。

#include<iostream>
using namespace std;
void QuickSort(double ar[], int left ,int right)

{
if(left<right)
{
int i = left;
int j = right;
double x = ar[i];
while(i<j)
{
while(i<j&&ar[j]>x)
j--;
if(i<j)
{
ar[i] = ar[j];
i++;
}
while(i<j&&ar[i]<x)
i++;
if(i<j)
{
ar[j] = ar[i];
j--;
}
}
ar[i] = x;
QuickSort(ar, left, i-1);
QuickSort(ar, i+1, right);
}
}
int main()
{
int n = 10 ;
double ar[]={5,78,45,67,45,55,24,89,54,9};
int i;
cout<<"排序前的数为：";
for(i=0;i<n;++i)
cout<<ar[i]<<' ';
cout<<endl;
QuickSort(ar,0,n-1);
cout<<"排序后的数为: ";
for(i=0;i<n;++i)
cout<<ar[i]<<' ';
cout<<endl;
return 0;
}

3.写一个处理用户信息的类，可以打印信息，支持修改密码。

#include <iostream>
#include <string>
using namespace std;
class user
{public:
   void setInfo(string name0,string password0="",string email0=" ");
   void changePassword();
   void printInfo();
 private:
   string name;
   string password;
   string email;
};

void user::setInfo(string name0,string password0,string email0)
{name=name0;
 password=password0;
 email=email0;
}

void user::changePassword()
{string old;
 int i=;
 cout<<"请输入原密码:"<<endl;
 cin>>old;
 while (old!=password && i<)
      {i++;
       cout<<"错误，请重新输入:"<<endl;
       cin>>old;
      }
 if(old==password)
   {cout<<"请输入新密码:"<<endl;
    cin>>password;
   }
 else if(i=)
   cout<<"请稍后再试"<<endl;
}

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

int main()
{user user1;
 user1.setInfo("Leonard");
 user1.printInfo();
 user1.changePassword();
 user1.printInfo();
 cout<<endl;
 user user2;
 user2.setInfo("Jonny","","[e-mail]");
 user2.printInfo();
 return ;
}