实验1

Complex.hpp文件源码

#ifndef COMPLEX_HPP
#define COMPLEX_HPP

#include<bits/stdc++.h>
using namespace std;
class Complex{
    public:
        Complex();
        Complex(double x);
        Complex(double x,double y);
        Complex(Complex &p);
        ~Complex() {}
        double get_real() const;
        double get_imag() const;
        void show() const;
        void add(Complex &c2);
        void add(const Complex &c2);
        friend Complex add(Complex &c1,Complex &c2);
        friend Complex add(Complex &c1,const Complex &c2);
        friend bool is_equal(Complex &c1,Complex &c2);
        friend bool is_equal(Complex &c1,const Complex &c2);
        friend double abs(Complex &c1);
    private:
        double real;
        double image;
};
Complex::Complex():real{0},image{0}
{
    
}
Complex::Complex(double x):real{x},image{0}
{
    
}
Complex::Complex(double x,double y):real{x},image{y}
{
    
}
Complex::Complex(Complex &p):real{p.real},image{p.image}
{
    
}
double Complex::get_real() const
{
    return real;
}
double Complex::get_imag() const
{
    return image;
}
void Complex::show() const
{
    cout << real;
    if(image>0)
    {
        cout << " + " << image << "i";
    }
    else if(image<0)
    {
        double x = -image;
        cout << " - " << x << "i";
    }
}
void Complex::add(Complex &c2)
{
    Complex c1;
    c1.real += c2.real ;
    c1.image += c2.image ;
} 
void Complex::add(const Complex &c2)
{
    real += c2.real ;
    image += c2.image ;
} 
Complex add(Complex &c1,Complex &c2)
{
    Complex c3;
    c3.real = c1.real + c2.real;
    c3.image = c1.image + c2.image;
    return c3;
}
Complex add(Complex &c1,const Complex &c2)
{
    Complex c3;
    c3.real = c1.real + c2.real;
    c3.image = c1.image + c2.image;
    return c3;
}
bool is_equal(Complex &c1,Complex &c2)
{
    return (c1.real == c2.real && c1.image == c2.image);
}
bool is_equal(Complex &c1,const Complex &c2)
{
    return (c1.real == c2.real && c1.image == c2.image);
}
double abs(Complex &c1)
{
    return sqrt(c1.real*c1.real+c1.image*c1.image);
}

#endif

 

main.cpp

#include "Complex.hpp"
#include <iostream>

int main()
{
    using namespace std;

    Complex c1(6,-8);
    const Complex c2(9);
    Complex c3(c1);

    cout << "c1 = ";
    c1.show();
    cout << endl;

    cout << "c2 = ";
    c2.show();
    cout << endl;
    cout << "c2.imag = " << c2.get_imag() << endl;

    cout << "c3 = ";
    c3.show();
    cout << endl;

    cout << "abs(c1) = ";
    cout << abs(c1) << endl;

    cout << boolalpha;
    cout << "c1 == c3 : " << is_equal(c1, c3) << endl;
    cout << "c1 == c2 : " << is_equal(c1, c2) << endl;

    Complex c4;
    c4 = add(c1, c2);
    cout << "c4 = c1 + c2 = ";
    c4.show();
    cout << endl;

    c1.add(c2);
    cout << "c1 += c2, " << "c1 = ";
    c1.show();
    cout << endl;
}

 

task4

User.hpp

#ifndef USER_HPP
#define USER_HPP

#include<bits/stdc++.h>
using namespace std;
class User{
    public:
        User(string a,string b = "111111",string c = ""):name{a},password{b},email{c} 
        {
            n++;
        }
        ~User() = default;
        void set_email()
        {
            cout << "Enter email address:";
            cin >> email;
            while(email.find('@') == -1 )
            {
                cout << "Warning:@ should be included.Please try again." << endl;
                cout << "Enter email address:"; 
                cin >> email;
            }
            cout << "email is set successfully..." << endl;
        }
        void change_passwd()
        {
            string d,e;
            int cnt=1;
            cout << "Enter old password:";
            cin >> d;
            while(cnt!=3)
            {
                if(d==password)
                {
                    cout << "Enter new password:";
                    cin >> e;
                    while(e.length() != 6)
                    {
                        cout << "Warning:length of the password should be six.Please try again." << endl;
                        cout << "Enter new password:";
                        cin >> e;
                    }
                    password = e;
                    cout << "new passwd is set successfully..." << endl;
                    break;
                }
                else
                {
                    cout << "password input error. Please re-enter again:";
                    cin >> d;
                    cnt++;
                    continue;
                }
            }
            if(cnt>=3)
            {
                cout << "password input error. Please try after a while." << endl;
            }
        }
        void print_info()
        {
            cout << left << setw(10) << "name:" << name << endl;
            cout << left << setw(10) << "passwd:" << "******" << endl;
            cout << left << setw(10) << "email:" << email << endl; 
        }
        static void print_n()
        {
            cout << "there are " << n << " users." << endl;
        }
    private:
        string name;
        string password;
        string email;
        static int n;
};
int User::n=0;

#endif

 

 

main.cpp

#include "User.hpp"
#include <iostream>

int main()
{
    using namespace std;

    cout << "testing 1......" << endl;
    User user1("Ronin","982576","982576@qq.com");
    user1.print_info();

    cout << endl
         << "testing 2......" << endl
         << endl;
    User user2("Donald");
    user2.change_passwd();
    user2.set_email();
    user2.print_info();

    User::print_n();
}

 

 

通过本次实验，我了解了string类的对象声明及其函数find、length等。

本次实验，在进行User.hpp编写时，因为中途曾进行编译，生成了一个.gch文件，导致后续编译时一直报错。

上网查了以后,明白那是gcc为了优化编译速度,如果一个文件里面包含的 .h  比较多的话，

gcc会先将.h头文件预编译成为 .h.gch文件,以便下次编译时能够更快,将会将.h.gch文件自动载入。

但该文件有一个很不好的地方就是，

如果我们修改了文件头的 .h 文件, gcc仍旧会编译原来的 .h.gch 文件, 不会载入新修改的文件头,很容易造成错误。

对于此的解决方案,我选择了直接删除.gch文件(更好的方案是选择全部重新编译)

而百度得知只需要将 Makefile文件 的 clean 目标项 修改为 rm -f *.o *.h.gch , 然后在重新编译就好.....