实验3 类与数组、指针

 1 #pragma once
 2 
 3 #include <iostream>
 4 using std::cout;
 5 using std::endl;
 6 
 7 class Point {
 8 public:
 9     Point(int x0 = 0, int y0 = 0);
10     ~Point() = default;
11 
12     int get_x() const;
13     int get_y() const;
14     void show() const;
15     void move(int new_x, int new_y);
16 
17 private:
18     int x, y;
19 };
20 
21 Point::Point(int x0, int y0): x{x0}, y{y0} {   
22 }
23 
24 int Point::get_x() const {
25     return x;
26 }
27 
28 int Point::get_y() const {
29     return y;
30 }
31 
32 void Point::show() const {
33     cout << "(" << x << ", " << y << ")" << endl;
34 }
35 
36 void Point::move(int new_x, int new_y) {
37     x = new_x;
38     y = new_y;
39 }

 1 #include <iostream>
 2 #include "point.hpp"
 3 #include <vector>
 4 
 5 using std::vector;
 6 using std::cin;
 7 
 8 // 输出vector<Point>对象内所有点的坐标
 9 void output(const vector<Point> &v) {
10     for(auto &t: v)
11         t.show();
12 }
13 
14 void test() {
15     int n;
16     cout << "输入动态Point数组类对象中元素个数: ";
17     cin >> n;
18 
19     vector<Point> x(n);
20     cout << "x对象中所有点坐标信息: " << endl;
21     output(x); 
22 
23     vector<Point> y(x);  // 基于vector<Point>对象x构建对象y
24     cout << "\nx对象中所有点坐标信息: " << endl;
25     output(y);
26     
27     cout << "\n更新x对象......" << endl;
28     x.at(0).move(30, 50);       // 更新对象x内索引为0的点对象坐标
29     x.push_back(Point(2, 2));   // 向x对象末尾添加一个点对象
30 
31     cout << "\nx对象中所有点坐标信息: " << endl;
32     output(x);          
33     cout << "\ny对象中所有点坐标信息: " << endl; 
34     output(y);           
35 }
36 
37 int main() {
38     test();
39 }

 1 #pragma once
 2 
 3 #include <iostream>
 4 using std::cout;
 5 using std::endl;
 6 
 7 class Point {
 8 public:
 9     Point(int x0 = 0, int y0 = 0);
10     ~Point() = default;
11 
12     int get_x() const;
13     int get_y() const;
14     void show() const;
15     void move(int new_x, int new_y);
16 
17 private:
18     int x, y;
19 };
20 
21 Point::Point(int x0, int y0): x{x0}, y{y0} {   
22 }
23 
24 int Point::get_x() const {
25     return x;
26 }
27 
28 int Point::get_y() const {
29     return y;
30 }
31 
32 void Point::show() const {
33     cout << "(" << x << ", " << y << ")" << endl;
34 }
35 
36 void Point::move(int new_x, int new_y) {
37     x = new_x;
38     y = new_y;
39 }

 1 #pragma once
 2 
 3 #include "point.hpp"
 4 #include <cassert>
 5 #include <iostream>
 6 
 7 class vectorPoint{
 8 public:
 9     vectorPoint(int n);
10     ~vectorPoint();
11     
12     int get_size() const;           // 获得当前动态数组内元素个数
13     Point& at(int index);           // 返回下标为index的元素引用
14     Point& at(int index) const;     // 返回下标为index的元素const引用
15 
16 private:
17     int size; // 动态数组的大小
18     Point *ptr;
19 };
20 
21 vectorPoint::vectorPoint(int n) : size{n} {
22     ptr = new Point[n];
23 }
24 
25 vectorPoint::~vectorPoint() {
26     delete[] ptr;
27 }
28 
29 int vectorPoint::get_size() const {
30     return size;
31 }
32 
33 Point& vectorPoint::at(int index) {
34     assert(index >= 0 && index < size);  // 宏，在测试模式下工作。如果不满足条件，则程序终止
35     return ptr[index];
36 }
37 
38 Point& vectorPoint::at(int index) const {
39     assert(index >= 0 && index < size);  
40     return ptr[index];
41 }

 1 #include "vectorPoint.hpp"
 2 #include <iostream>
 3 
 4 // 输出vectorPoint对象内的所有数据
 5 void output(const vectorPoint &v) {
 6     for(auto i = 0; i < v.get_size(); ++i)
 7         v.at(i).show();
 8 }
 9 
10 // 测试vectorPoint类：构造对象、复制构造对象
11 void test() {
12     using namespace std;
13 
14     int n;
15     cout << "输入vectorPoint对象中元素个数: ";
16     cin >> n;
17 
18     vectorPoint x(n);
19     cout << "x对象中所有点坐标信息: " << endl;
20     output(x); 
21 
22     vectorPoint y(x);
23     cout << "\ny对象中所有点坐标信息: " << endl;
24     output(y); 
25 
26     cout << "\n更新x对象中点坐标信息......" << endl;
27     x.at(0).move(30, 50);
28     x.at(1).move(-1, -1);
29 
30     cout << "x对象中所有点坐标信息: " << endl;
31     output(x); 
32 
33     cout << "\ny对象中所有点坐标信息: " << endl;
34     output(y); 
35 }
36 
37 int main() {
38     test();
39 }