实验任务5
1 #pragma once
2 #include<iostream>
3
4 using std::cout;
5 using std::endl;
6
7 class vectorInt {
8 public:
9 //构造函数和析构函数
10 vectorInt(int n);
11 vectorInt(int n, int value);
12 vectorInt(const vectorInt& X);
13 ~vectorInt(); //~vectorInt()=default; 默认合成的析构函数
14
15 //其它成员函数
16 int& at(int i);
17 int get_size();
18
19 //友元函数
20 friend void output(const vectorInt& X);
21
22 private:
23 int size;
24 int* p;
25 };
26
27 vectorInt::vectorInt(int n) :size{ n } {
28 cout << "constructor 1 called.\n";
29 p = new int[size];
30 }
31
32 vectorInt::vectorInt(int n, int value) :size{ n }
33 {
34 cout << "constuctot 2 called" << endl;
35 p = new int[size];
36 for (int i = 0; i < n; ++i)
37 p[i] = value;
38 }
39
40 vectorInt::vectorInt(const vectorInt& X) :size{ X.size }
41 {
42 cout << "copy constuctot called" << endl;
43 p = new int[X.size];
44 for (auto i = 0; i < X.size; ++i)
45 p[i] = X.p[i];
46 }
47
48 vectorInt::~vectorInt() {
49 cout << "destructor called.\n";
50 delete[]p;
51 }
52
53 int& vectorInt::at(int i) {
54 return p[i];
55 }
56
57 int vectorInt::get_size() {
58 return size;
59 }
60
61 void output(const vectorInt& X) {
62 for (auto i = 0; i < X.size; i++)
63 cout << X.p[i] << " ";
64 cout << endl;
65 }
vectorInt.hpp
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 }
task5.cpp
实验测试截图：
实验任务6
1 #pragma once
2 #include <iostream>
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 // 类Matrix的实现：
24
25 Matrix::Matrix(int n) :lines(n), cols(n) {
26 p = new double[n * n];
27 }
28
29 Matrix::Matrix(int n, int m) :lines(n), cols(m){
30 p = new double[n * m];
31 }
32
33 Matrix::Matrix(const Matrix& X) :lines(X.lines), cols(X.cols) {
34 p = new double[X.lines * X.cols];
35 for (auto i = 0; i < X.lines * X.cols; i++) {
36 p[i] = X.p[i];
37 }
38 }
39
40 Matrix::~Matrix() {
41 delete[]p;
42 }
43
44 void Matrix::set(const double* pvalue) {
45 for (int i = 0; i < lines * cols; i++) {
46 p[i] = pvalue[i];
47 }
48 }
49
50 void Matrix::set(int i, int j, int value) {
51 p[i * cols + j] = value;
52 }
53
54 double& Matrix::at(int i, int j) {
55 return p[i * cols + j];
56 }
57
58 double Matrix::at(int i, int j)const {
59 return p[i * cols + j];
60 }
61
62 int Matrix::get_lines()const {
63 return lines;
64 }
65
66 int Matrix::get_cols()const {
67 return cols;
68 }
69
70 void Matrix::print()const {
71 for (auto i = 0; i < lines * cols; i++) {
72 cout << p[i] << " ";
73 if ((i+1) % cols == 0) cout << '\n';
74 }
75 }
matrix.hpp
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 }
task6.cpp
测试截图：
标签：const,Matrix,int,lines,cols,实验,数组,vectorInt,指针 From： https://www.cnblogs.com/Terrence0403/p/16861280.html