实验任务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="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<<"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;
}
实验任务2
#include<iostream>
using namespace std;
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(12, 18);
p1.show(); Point p2 = p1;
p2.show(); Point p3{p2};
p3.show(); cout << p3.get_x() << endl;
}
实验任务3
#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(15, 20, 5);
c1.show_time();
c1 = reset();
c1.show_time();
Clock c2(c1);
c2.set_time(6);
c2.show_time();
}
实验任务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 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{ 2049 };
x2.show();
X x3{ x1 };
x3.show();
X x4{ std::move(x2) };
x4.show();
}
x1.show();
调用默认构造函数;
x2.show();
调用构造函数;
X x3{ x1 };
调用复制构造函数;
X x4{ std::move(x2) };
调用移动构造函数
实验任务5
#include <iostream>
#include <iomanip>
class Rectangle {
public:
Rectangle();
Rectangle(double length, double width);
Rectangle(Rectangle& rect);
~Rectangle();
double len() const { return length; }
double wide() const { return width; }
double area() const { return width * length; }
double circumference() const { return (length + width) * 2; }
void resize(double times);
void resize(double length_times, double width_times);
private:
double length, width;
};
Rectangle::Rectangle() :length{ 2.0 }, width{ 2.0 } {}
Rectangle::Rectangle(double l, double w) : length{ l }, width{ w } {}
Rectangle::Rectangle(Rectangle& rect) : length{ rect.length }, width{ rect.width } {}
Rectangle::~Rectangle() {}
void Rectangle::resize(double times)
{
length = length * times;
width = width * times;
}
void Rectangle::resize(double length_times, double width_times)
{
length = length * length_times;
width = width * width_times;
}
void output(const Rectangle& rect) {
using namespace std;
cout << "矩形信息: \n";
cout << fixed << setprecision(2);
cout << setw(3) << "长度为:" << rect.len() << endl;
cout << setw(3) << "宽度为:" << rect.wide() << endl;
cout << setw(3) << "周长为:" << rect.circumference() << endl;
cout << setw(3) << "面积为: " << rect.area() << endl;
};
int main() {
Rectangle rect1;
output(rect1);
Rectangle rect2(10, 5);
output(rect2);
Rectangle rect3(rect1);
rect3.resize(2);
output(rect3);
rect3.resize(5, 2);
output(rect3);
}