实验2 类和对象(2)

task1

代码：

#include <iostream>
#include <complex>
int main()
{
using namespace std;
complex<double> c1{3, 4}, c2{4.5};
const complex<double> c3{c2};
cout << "c1 = " << c1 << endl;
cout << "c2 = " << c2 << endl;
cout << "c3 = " << c3 << endl;
cout << "c3.real = " << c3.real() << endl;
cout << "c3.imag = " << c3.imag() << endl;
cout << "c1 + c2 = " << c1 + c2 << endl;
cout << "c1 - c2 = " << c1 - c2 << endl;
cout << "abs(c1) = " << abs(c1) << endl; // abs()是标准库中数学函数，对复数进行取模
cout << boolalpha; // 设置bool型值以true/false方式输出
cout << "c1 == c2 : " << (c1 == c2) << endl;
cout << "c3 == c2 : " << (c3 == c2) << endl;
complex<double> c4 = 2;
cout << "c4 = " << c4 << endl;
c4 += c1;
cout << "c4 = " << c4 << endl;
}

 

测试结果：

 

 

task2

代码：

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// 妯℃澘鍑芥暟
// 瀵规弧瓒崇壒瀹氭潯浠剁殑搴忓垪绫诲瀷T锛屼娇鐢ㄨ寖鍥磃or杈撳嚭
template<typename T>
void output1(const T &obj) {
    for(auto i: obj)
        std::cout << i << ", ";
    std::cout << "\b\b \n";
}

// 妯℃澘鍑芥暟
// 瀵规弧瓒崇壒瀹氭潯浠剁殑搴忓垪绫诲瀷T锛屼娇鐢ㄨ凯浠ｅ櫒杈撳嚭
template<typename T>
void output2(const T &obj) {
    for(auto p = obj.cbegin(); p != obj.cend(); ++p)
        std::cout << *p << ", ";
    std::cout << "\b\b \n";
}

int main() {
    using namespace std;

    array<int, 5> x1; // 鍒涘缓涓€涓猘rray瀵硅薄锛屽寘鍚?涓猧nt绫诲瀷鍏冪礌锛屾湭鍒濆鍖?
    cout << "x1.size() = " << x1.size() << endl; // 杈撳嚭鍏冪礌涓暟
    x1.fill(42); // 灏唜1鐨勬墍鏈夊厓绱犲€奸兘璧嬪€间负42
    x1.at(0) = 999;  // 鎶婁笅鏍囦负0鐨勫厓绱犱慨鏀逛负999
    x1.at(4) = -999; // 鎶婁笅鏍囦负4鐨勫厓绱犱慨鏀逛负-999
    x1[1] = 777; // 鎶婁笅鏍囦负1鐨勫厓绱犱慨鏀逛负777
    cout << "x1: ";
    output1(x1);
    cout << "x1: ";
    output2(x1);


    array<double, 10> x2{1.5, 2.2}; // 鍒涘缓瑕佺粰array瀵硅薄锛屽寘鍚?0涓猟ouble绫诲瀷鍏冪礌锛屽垵濮嬪寲閮ㄥ垎鍏冪礌
    cout << "x2.size() = " << x2.size() << endl;
    cout << "x2: ";
    output1(x2);

    array<int, 5> x3{x1};
    cout << boolalpha << (x1 == x3) << endl;
    x3.fill(22);
    cout << "x3: ";
    output1(x3);

    swap(x1, x3); // 浜ゆ崲x1鍜寈3鐨勬暟鎹?
    cout << "x1: ";
    output1(x1);
    cout << "x3: ";
    output1(x3);
}

 

测试结果：

 

task3

代码：

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

void test() {
    using std::cout;
    using std::endl;

    cout << Employee::doc << endl << endl;

    Employee employee1;
    employee1.set_info("Sam", 30000, 2015, 1, 6);
    employee1.update_hire_date(2017, 6, 30);
    employee1.update_salary(35000);
    employee1.display_info();
    cout << endl << endl;

    Employee employee2{"Tony", 20000, 2020, 3, 16};
    employee2.raise_salary(15); // 鎻愭垚15%
    employee2.display_info();
    cout << endl << endl;

    Employee::display_count();
}

int main() {
    test();
}

 

测试结果：

 

 

task4

代码：

#include<cmath>
class Complex
{
    public:
        Complex(){
            real=0;
            imag=0;
        }
        Complex(float x){
            real=x;
            imag=0;
        }
        Complex(float x,float y){
            real=x;
            imag=y;
        }
        Complex(const Complex &xx){
            real=xx.get_real();
            imag=xx.get_imag();
        }
        float get_real() const;
        float get_imag() const;
        void show() const;
        friend Complex add (const Complex,const Complex);
        friend bool is_equal (const Complex,const Complex);
        friend float abs (const Complex);
    private:
        float real,imag;
 } ;
Complex::float get_real() const{
            return real;
        }
Complex::float get_imag() const{
            return imag;
        }
Complex::void show() const{
            printf("%f+%fi\n",real,imag);
        }
Complex::void add(Complex &xx){
            real+=xx.get_real();
            imag+=xx.get_imag();
        }
Complex add(Complex a,Complex b)
{
    Complex c(a.get_real()+b.get_real(),a.get_imag()+b.get_imag());
    return c;
}
bool is_equal(Complex a,Complex b)
{
    if(a.get_imag()==b.get_imag()&&a.get_real()==b.get_real())
    return true;
    else return false;
}
float abs(Complex a)
{
    return sqrt(a.get_real()*a.get_real()+a.get_imag()*a.get_imag());
}

 

测试结果：

 

task5

代码：

#include<iostream>
#include<cstring>
using namespace std;
class User
{
    public:
        User(string a,string b="111111",string c="")
        {
            name=a;
            password=b;
            email=c;
            n++;
        }
        ~User(){
            n--;
        }
        static int n;
        void set_email()
        {
            printf("请输入邮箱：");
            cin>>email;
        }
        void change_passwd(){
            string f="";
            int t=0;
            while(f!=password&&t<3)
            {
            printf("输入旧密码：");
            cin>>f;
            t++;
            }
            if(t==3) printf("稍后再试");
            else 
            {
                printf("输入新密码:");
                cin>>f;
                password=f;
             } 
        }
        void print_info(){
            cout<<"用户名:"<<name<<endl;
            cout<<"密码：";
            for(int i=0;i<password.length();i++) cout<<'*';
            cout<<endl;
            cout<<"邮箱："<<email; 
        }
        static void print_n(){
            cout<<"n="<<n;
        }
    private:
        string name,password,email;
 } ;
 int User::n=0;

 

测试结果：