实验1 类和对象

#include<iostream>
using std::cout;
using std::endl;

class Point{
    public:
        Point(int x0=0,int y0=0);
        Point(const Point& p);
        ~Point()=default;
        
        int get_x() const{return x;}
        int get_y() const{return y;}
        void show() const;
        
    private:
        int x,y;
};

Point::Point(int x0,int y0):x{x0},y{y0}{
       cout <<"copy constructor called"<<endl;
}

Point ::Point(const Point& p):x{p.x},y{p.y} {
       cout <<"copy constructor called"<<endl;
}

void Point::show() const{
    cout<<"("<<x<<","<<y<<")"<<endl;
}

int main() {
      Point p1(4, 5); 
      p1.show();
      Point p2 = p1;
       
      p2.show();
      Point p3{p2};
       
      p3.show();
      cout << p3.get_x() << endl;
}

 

实验三

#include<iostream>
#include<iomanip>

using std::cout;
using std::endl;

class Clock{
    public:
        Clock(int h=0,int m=0,int s=0);
        Clock(const Clock&t);
        ~Clock()=default;
         
        void set_time(int h,int m=0,int s=0);
        void show_time() const;
        
    private:
        int hour,minute,second;
};

Clock::Clock(int h, int m, int s): hour{h}, minute{m}, second{s} {
        cout << "constructor called" << endl;
}

Clock::Clock(const Clock& t): hour{t.hour}, minute{t.minute},second{t.second} {
        cout << "copy constructor called" << endl;
}

void Clock::set_time(int h,int m,int s){
    hour=h;
    minute=m;
    second=s;
}

void Clock::show_time()const{
    using std::setw;
    using std::setfill;
    
    cout<<setfill('0')<<setw(2)<<hour<<":"<<setw(2)<<minute<<":"<<setw(2)<<second<<endl;
    
}

Clock reset(){
    return Clock(0,0,0);
}

int main(){
    Clock c1(12,0,5);
    c1.show_time();
    
    c1=reset();
    c1.show_time();
    
    Clock c2(c1);
    c2.set_time(6);
    c2.show_time();
}

 

实验四

#include<iostream>

class X{
    public:
        X();
        ~X();
        X(int m);
        X(const X &obj);
        X(X&&obj)noexcept;
        void show() const;
    
    private:
        int data;
};

X::X():data{42}{
    std::cout<<"default constructor called.\n";
}

X::~X(){
    std::cout<<"destructor called.\n";
}

X::X(int m):data{m}{
    std::cout<<"constructor called.\n";
}

X::X(const X& obj): data{obj.data} {
    std::cout << "copy constructor called.\n";
}

X::X(X&& obj) noexcept: data{obj.data} {
    std::cout << "move constructor called.\n";
}

void X::show()const{
    std::cout<<data<<std::endl;
}

int main(){
    X x1;
    x1.show();
    
    X x2{1111};
    x2.show();
    
    X x3{x1};
    x3.show();
    
    X x4{std::move(x2) };
    x4.show();
}

 

实验一

#include <iostream>
#include <string>
#include <vector>
int main()
{
using namespace std;
string s1;
string s2{"c plus plus"}; 
string s3{s2};
string s4 = s2; 
s1 = "oop";


vector<string> v1;
v1.push_back(s1); 
v1.push_back(s2 + "1");
v1.push_back(s3 + "2");
v1.push_back(s4 + "3");

cout << "output1: " << endl;
for(auto item: v1)
cout << item << endl;

cout << "ouput2: ";
for(auto p = v1.begin(); p != v1.end(); ++p)
cout << *p << endl;

cout << "output3: " << endl;
for(auto i = 0; i < v1.size(); ++i)
cout << v1[i] << endl;
vector<string> v2{v1.rbegin(), v1.rend()}; 

cout << "v2: " << endl;
for(auto item: v2)
cout << item << endl;
}

 

 

 实验5

#include<iostream>
#include<iomanip>
using namespace std;

class Rectangle {
public:
    Rectangle(); //默认构造函数
    Rectangle(float l, float w); //带有两个参数的构造函数
    Rectangle(Rectangle& r); //复制构造函数
    ~Rectangle() {};//析构函数

    float len() { return length; }
    float wide() { return width; }
    float area() { float area = length * width; return area; }
    float circumference() { float cir = 2 * (length + width); return cir; }
    void resize(float times) { length *= times; width *= times; }
    void resize(float l_times, float w_times) { length *= l_times; width *= w_times; }

private:
    float length, width;

};

Rectangle::Rectangle() :length(2.0), width(1.0) {
}
Rectangle::Rectangle(float l, float w) : length(l), width(w) {
}


Rectangle::Rectangle(Rectangle& r) {
    length = r.length;
    width = r.width;
}

void output(Rectangle r) {

    cout << "矩形信息：\n";
    cout << fixed << setprecision(2);
    cout << "长：" << r.len() << endl << "宽: " << r.wide()<<endl << "面积：" << r.area() << endl << "周长: " << r.circumference() << endl<<endl;

}

int main() {
    Rectangle rect1;
    output(rect1);

    Rectangle rect2(10.0, 5.0);
    output(rect2);

    Rectangle rect3(rect1);
    rect3.resize(2.0);
    output(rect3);

    rect3.resize(5.0, 2.0);
    output(rect3);
}