实验1 类和对象

标签：width 对象 float int length 实验 include Rectangle

实验1

#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 = "opp";
    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 << "output2: ";
    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1

#include<iostream>
#include<string>
#include<vector>
#include<cmath>
#include<cstdlib>
#include<time.h>

template<typename T>
void output(const T& obj)
{
    for (auto item : obj)
        std::cout << item << " ";
    std::cout << std::endl;
}

int main()
{
    using namespace std;
    vector<int> v1{ 1,9,8,4 };
    v1.insert(v1.begin(), 2022);
    v1.insert(v1.end(), 2023);

    cout << "v1: ";
    output(v1);

    v1.pop_back();
    v1.erase(v1.begin());
    cout << "v1: ";
    output(v1);

    vector<string> v2{ "《1984》","《动物农场》","《美丽新世界》" };
    cout << "v2: ";
    output(v2);
}

实验2

#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 << "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(8, 2);
    p1.show();

    Point p2 = p1;
    p2.show();

    Point p3{ p2 };
    p3.show();
    cout << p3.get_x() << endl;
}

实验3

#include<iostream>
#include<iomanip>

using namespace std;

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 {
    cout << setfill('0') << setw(2) << hour << ":"
        << setw(2) << minute << ":"
        << setw(2) << second << endl;
}

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

int main()
{
    Clock c1(11, 0, 7);
    c1.show_time();

    c1 = reset();
    c1.show_time();

    Clock c2(c1);
    c2.set_time(6);
    c2.show_time();
}

实验4

#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 canstructor 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{ 2049 };
    x2.show();

    X x3{ x1 };
    x3.show();

    X x4(std::move(x2));
    x4.show();
}

析构函数的调用是在初始化的时候就进行了调用了，是按照声明的顺序进行调用的

实验5

#include<iostream>
#include<iomanip>

class Rectangle
{
private:
    float length, width;
public:
    Rectangle();
    Rectangle(float l, float w);
    Rectangle(const Rectangle& rect);
    ~Rectangle();
    float len();
    float wide();
    float area();
    float circumference();
    float resize(int times);
    float resize(int l_times,int W_times);
    void output(const Rectangle& rect);
};

Rectangle::Rectangle() :length{ 2.0 }, width{ 1.0 } {
}

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

Rectangle::Rectangle(const Rectangle& rect) : length{ rect.length }, width{ rect.width } {
}

Rectangle::~Rectangle() {
}

float Rectangle::len() {
    return length;
}

float Rectangle::wide() {
    return width;
}

float Rectangle::area(){
    return length * width;
}

float Rectangle::circumference() {
    return 2 * (length + width);
}

float Rectangle::resize(int times) {
    length = length*times;
    width = width*times;
    return length, width;
}

float Rectangle::resize(int l_times, int r_times) {
    length = length * l_times;
    width = width * r_times;
    return length, width;
}


void Rectangle::output(const Rectangle &rect) {
    using namespace std;

    cout << "矩阵信息:\n";
    cout << fixed << setprecision(2);
    cout << left << setw(8) << "长: " << len() << endl;
    cout << left << setw(8) << "宽: " << wide() << endl;
    cout << left << setw(8) << "面积: " << area() << endl;
    cout << left << setw(8) << "周长: " << circumference() << endl;
}

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

    Rectangle rect2(10, 5);
    rect2.output(rect2);

    Rectangle rect3(rect1);
    rect3.resize(2);
    rect3.output(rect3);

    rect3.resize(5, 2);
    rect3.output(rect3);
}

 

标签：width,对象,float,int,length,实验,include,Rectangle
From： https://www.cnblogs.com/lyjlyjlyj/p/16748719.html