task 3 Complex.hpp 代码如下：

 

#include<iostream>
#include<math.h>
using namespace std;
class Complex{
	public:
		Complex();
		Complex(double real1,double imag1);
		Complex(double real1);
		Complex(const Complex &r);   //复制构造函数 
		
		double get_real() const;   //返回函数实部 
		double get_imag() const;   //返回函数虚部 
		void show() const;   //输出结果 
		void add(Complex &m);   //一个复数加上本身 
		
		friend Complex add(const Complex &c1,const Complex &c2);   //实现两个复数相加 
		friend bool is_equal(const Complex &c1,const Complex &c2);   //bool型判断两个复数是否相同 
		friend double abs(const Complex &x1);   //计算复数的取模运算 
		
		private:
			double real,imag;
	
	
};
Complex::Complex():real(0),imag(0){
}
Complex::Complex(double real1)
{
	real=real1;
	imag=0;
//	cout<<real<<endl;
}
Complex::Complex(double real1,double imag1)
{
	real=real1;
	imag=imag1;
}
Complex::Complex(const Complex &r)
{
	real=r.real;
	imag=r.imag;
}
double Complex::get_real() const
{
	//cout<<real<<endl;
	return real;

}
double Complex::get_imag() const
{
	return imag;
}
void Complex::add(Complex &m)
{
	real=real+m.real;
	imag=imag+m.imag;
}
void Complex::show() const
{
	double n1,n2;
	n1=get_real();
	//cout<<n1<<endl;
	n2=get_imag();
	if(n1==0&&n2==0)
	{
		cout<<n1;
	}
	else {
		if(n1==0)
		{
			cout<<n2<<"i";
		}
		else {
			if(n2==0)
			{
				cout<<n1;
			}
			else {
				if(n2>0)
				 cout<<n1<<"+"<<n2<<"i";
				else cout<<n1<<n2<<"i";
			}
		}
	}
}

Complex add(const Complex &c1,const Complex &c2)
{
	Complex c3;
	c3.real=c1.real+c2.real;
	c3.imag=c1.imag+c2.imag;
	return c3;
}
double abs(const Complex &x1)
{
	double x;
	x=sqrt(x1.real*x1.real+x1.imag*x1.imag);

	return x;
}
bool is_equal(const Complex &c1,const Complex &c2)
{
	if(c1.real==c2.real&&c1.imag==c2.imag)
	  return true;
	else return false;
}

　　

更换数据后运行结果如下：

 

 

task4 User.hpp 代码如下：

 

#include<iostream>
#include<string>
using namespace std;
class User{
	public:
		User(string name1);
		User(string name1,string password1,string email1);
		
		void set_email();   //设置email 
		void change_passwd();    //改密码 
		void print_info();    //输出结果 
		static void print_n(); 
		
	private:
		string name,password,email;
		static int n;   //直接操作类的成员需要用静态变量 
};
int User::n=0;   //静态成员只能类外初始化 
User::User(string name1)
{
	name=name1;
	password="111111";
	email="";
	n++;
}
User::User(string name1,string password1,string email1)
{
	name=name1;
	password=password1;
	email=email1;
	n++;
}
111
void User::set_email()
{
	string t;
	cout<<"Enter email address:";
	cin>>t;
	email=t;
	cout<<"email is set successfully···"<<endl;
}
void User::change_passwd()
{
	string t0,t1;  //t0作原密码，t1作新密码 
	cout<<"Enter old password:";
	for(int i=1;i<=3;i++)
	{
		cin>>t0;
		if(t0==password)
		{
			cout<<"Enter new password:";
			cin>>t1;
			password=t1;
			break; 
		}
		else if(i<=2){
			cout<<"password input error. Please re-enter again:";
		}
		else cout<<"password input error. Please try after a while."<<endl;   //三次错误则无法再输入 
	}
}
void User::print_info()
{
	cout<<"name:"<<name<<endl;
	cout<<"passwd:"<<"******"<<endl;
	cout<<"email:"<<email<<endl; 
}
void User::print_n()
{
	if(n==1)
	  cout<<"there are "<<n<<" user."<<endl;
	else cout<<"there are "<<n<<" users."<<endl;
}

　　

更换数据后运行结果如下：