实验任务五：
vectorInt.hpp： 1 #include <iostream>
2 #include <cassert>
3 using namespace std;
4 class vectorInt {
5 public:
6 vectorInt(int n);
7 vectorInt(int n, int x0);
8 vectorInt(const vectorInt& vp);
9 ~vectorInt();
10 int& at(int index);
11 int get_size()const;
12 friend void output(vectorInt&x);
13 private:
14 int size;
15 int* p;
16 };
17 int vectorInt::get_size()const {
18 return size;
19 }
20 vectorInt::vectorInt(int n, int x0) {
21 cout << "constructor 2 called" << endl;
22 size = n;
23 p = new int[size];
24 for (auto i = 0; i < size; ++i)
25 p[i] = x0;
26 }
27 vectorInt::vectorInt(const vectorInt& vp) : size{ vp.size } {
28 cout << "copy constructor called" << endl;
29 p = new int[size];
30 for (auto i = 0; i < size; ++i)
31 p[i] = vp.p[i];
32 }
33 vectorInt::vectorInt(int n) : size{ n } {
34 cout << "constructor 1 called" << endl;
35 p = new int[n];
36 }
37 vectorInt::~vectorInt() {
38 cout << "destructor called" << endl;
39 delete[] p;
40 }
41 int& vectorInt::at(int index) {
42 assert(index >= 0 && index < size);
43 return p[index];
44 }
45 void output(vectorInt& x) {
46 for (auto i = 0; i < x.size; ++i)
47 cout << x.at(i) << " ";
48 cout << endl;
49 }
task5.cpp：
1 #include <iostream>
2 #include "vectorInt.hpp"
3 void test() {
4 using namespace std;
5 int n;
6 cin >> n;
7 vectorInt x1(n);
8 for (auto i = 0; i < n; ++i)
9 x1.at(i) = i * i;
10 output(x1);
11 vectorInt x2(n, 42);
12 vectorInt x3(x2);
13 output(x2);
14 output(x3);
15 x2.at(0) = 77;
16 output(x2);
17 output(x3);
18 }
19 int main() {
20 test();
21 }
运行截图：
实验任务六：
Matrix.hpp: 1 #include <iostream>
2 #include<cassert>
3 using std::cout;
4 using std::endl;
5 class Matrix {
6 public:
7 Matrix(int n); // 构造函数，构造一个n*n的矩阵
8 Matrix(int n, int m); // 构造函数，构造一个n*m的矩阵
9 Matrix(const Matrix& X); // 复制构造函数，使用已有的矩阵X构造
10 ~Matrix(); //析构函数
11 void set(const double* pvalue); // 用pvalue指向的连续内存块数据按行为矩阵赋值
12 void set(int i, int j, int value); //设置矩阵第i行第j列元素值为value
13 double& at(int i, int j); //返回矩阵第i行第j列元素的引用
14 double at(int i, int j) const; // 返回矩阵第i行第j列元素的值
15 int get_lines() const; //返回矩阵行数
16 int get_cols() const; //返回矩列数
17 void print() const; // 按行打印输出矩阵
18 private:
19 int lines; // 矩阵行数
20 int cols; // 矩阵列数
21 double* p; // 指向存放矩阵数据的内存块的首地址
22 };
23 Matrix::Matrix(int n) :lines(n), cols(n) {
24 p = new double[n * n];
25 }
26 Matrix::Matrix(int n, int m) :lines(n), cols(m) {
27 p = new double[n * m];
28 }
29 Matrix::Matrix(const Matrix& X) :lines(X.lines), cols(X.cols) {
30 cout << "copy constructor called" << endl;
31 p = new double[lines * cols];
32 for (auto i = 0; i < cols * lines; i++)
33 p[i] = X.p[i];
34 }
35 Matrix::~Matrix() {
36 delete[]p;
37 }
38 void Matrix::set(const double* pvalue) {
39 for (auto i = 0; i < cols * lines; i++) {
40 p[i] = pvalue[i];
41 }
42 }
43 void Matrix::set(int i, int j, int value) {
44 p[i * cols + j] = value;
45 }
46 double& Matrix::at(int i, int j) {
47 assert(i >= 0 && i < lines&& j >= 0 && j < cols);
48 return p[i * cols + j];
49 }
50 double Matrix::at(int i, int j) const {
51 assert(i >= 0 && i < lines&& j >= 0 && j < cols);
52 return p[i * cols + j];
53 }
54 int Matrix::get_lines() const {
55 return lines;
56 }
57 int Matrix::get_cols() const {
58 return cols;
59 }
60 void Matrix::print() const {
61 for (auto i = 0; i < lines; i++) {
62 for (auto j = 0; j < cols; j++) {
63 cout << p[i * cols + j] << ' ';
64 }
65 cout << endl;
66 }
67 }
task6.cpp:
1 #include <iostream>
2 #include "matrix.hpp"
3 void test() {
4 using namespace std;
5 double x[] = { 1, 2, 3, 4, 5, 6 };
6 Matrix m1(3, 2); // 创建一个3×2的矩阵
7 m1.set(x); // 用一维数组x的值按行为矩阵m1赋值
8 m1.print(); // 打印矩阵m1的值
9 cout << "the first line is: " << endl;
10 cout << m1.at(0, 0) << " " << m1.at(0, 1) << endl; // 输出矩阵m1第1行两个元素的值
11 cout << endl;
12 Matrix m2(2, 3);
13 m2.set(x);
14 m2.print();
15 cout << "the first line is: " << endl;
16 cout << m2.at(0, 0) << " " << m2.at(0, 1) << " " << m2.at(0, 2) << endl;
17 cout << endl;
18 Matrix m3(m2); // 用矩阵m2构造新的矩阵m3
19 m3.set(0, 0, 999); // 将矩阵m3第0行第0列元素值设为999
20 m3.print();
21 }
22 int main() {
23 test();
24 }
运行截图：
更改数据后运行截图：
标签：const,Matrix,int,lines,cols,实验,vectorInt From： https://www.cnblogs.com/dyb20030328/p/16852868.html