实验任务四
vector_int.hpp
1 #ifndef VECTOR_INT_HPP
2 #define VECTOR_INT_HPP
3 #include<iostream>
4 #include<cassert>
5
6 using namespace std;
7 class Vector_int
8 {
9 public:
10 Vector_int(int n) : size{n}
11 {
12 cout << "constructor called." << endl;
13 p = new int[size]();
14 for(int i = 0; i < size; i++)
15 p[i] = 0;
16 }
17
18 Vector_int(int n, int m) : size{n}
19 {
20 cout << "constructor called." << endl;
21 p = new int[size];//向系统申请n个int型数据项空间
22 for(int i = 0; i < size; i++)
23 p[i] = m;
24 }
25
26 Vector_int(const Vector_int &x) : size{x.size}
27 {
28 cout << "copy constructor called." << endl;
29 p = new int[size];
30 for(int i = 0; i < size; i++)
31 {
32 p[i] = x.p[i];
33 }
34 }
35
36 ~Vector_int()
37 {
38 cout << "deleting..." << endl;
39 delete[] p;
40 }
41 //设置数组元素值
42 void reset_p()
43 {
44 int temp;
45 cout << "请输入数组元素： " << endl;
46 for(int i = 0; i < size; i++)
47 {
48 cin >> temp;
49 p[i] = temp;
50 }
51 }
52
53 void show_p()
54 {
55 cout << "数组元素： " << endl;
56 for(int i = 0; i < size; i++)
57 {
58 cout << p[i] << " ";
59 }
60 cout << endl;
61 }
62
63 // 通过at()方法访问对象中索引为index的数据项
64 int &at(int index)
65 {
66 assert(index >= 0 && index < size);
67 return p[index];
68 }
69 private:
70 int size;//数组大小
71 int *p;
72 };
73
74 #endif
task4.cpp
1 #include<iostream>
2 #include"vector_int.hpp"
3
4 using namespace std;
5
6 int main()
7 {
8 int n, m, index;
9 cin >> n >> m;
10 Vector_int x(n);
11 x.show_p();
12 x.reset_p();
13 x.show_p();
14 x.at(0) = 999;
15 cout << "索引后";
16 x.show_p();
17
18 Vector_int x2(n, m);
19 x2.show_p();
20 x2.reset_p();
21 x2.show_p();
22 x.at(0) = 999;
23 cout << "索引后";
24 x.show_p();
25
26 Vector_int y(x2);
27 y.show_p();
28 x.at(0) = 999;
29 cout << "索引后";
30 x.show_p();
31
32 return 0;
33 }
实验任务五
Matrix.hpp
1 #ifndef MATRIX_H
2 #define MATRIX_H
3 #include <iostream>
4
5 using namespace std;
6 class Matrix
7 {
8 public:
9 Matrix(int n); // 构造函数，构造一个n*n的矩阵
10 Matrix(int n, int m); // 构造函数，构造一个n*m的矩阵
11 Matrix(const Matrix &X); // 复制构造函数，使用已有的矩阵X构造
12 ~Matrix(); //析构函数
13 void set(const double *pvalue); // 用pvalue指向的连续内存块数据按行为矩阵赋值
14 void set(int i, int j, int value); //设置矩阵第i行第j列元素值为value
15 double &at(int i, int j); //返回矩阵第i行第j列元素的引用
16 double at(int i, int j) const; // 返回矩阵第i行第j列元素的值
17 int get_lines() const; //返回矩阵行数
18 int get_cols() const; //返回矩列数
19 void print() const; // 按行打印输出矩阵
20 private:
21 int lines; // 矩阵行数
22 int cols; // 矩阵列数
23 double *p; // 指向存放矩阵数据的内存块的首地址
24 };
25 // 类Matrix的实现：
26 Matrix::Matrix(int n): lines{n}, cols{n}
27 {
28 p = new double[n*n];
29 }
30
31 Matrix::Matrix(int n, int m):lines{n}, cols{m}
32 {
33 p = new double[n*m];
34 }
35
36 Matrix::Matrix(const Matrix &X):lines{X.lines}, cols{X.cols}
37 {
38 p = new double[lines*cols];
39 for(int i = 0; i < lines*cols; i++)
40 {
41 p[i] = X.p[i];
42 }
43 }
44
45 Matrix::~Matrix() {}
46
47 void Matrix::set(const double *pvalue)
48 {
49 for(int i = 0; i < lines*cols; i++)
50 {
51 p[i] = pvalue[i];
52 }
53 }
54
55 void Matrix::set(int i, int j, int value)
56 {
57 p[i * cols + j] = value;
58 }
59
60 double &Matrix::at(int i, int j)
61 {
62 return p[i * cols + j];
63 }
64
65 double Matrix::at(int i, int j) const
66 {
67 return p[i * cols + j];
68 }
69
70 int Matrix::get_lines() const
71 {
72 return lines;
73 }
74
75 int Matrix::get_cols() const
76 {
77 return cols;
78 }
79
80 void Matrix::print() const
81 {
82
83 for(int i = 0; i < lines; i++)
84 {
85 for(int j = 0; j < cols; j++)
86 {
87 cout << p[i * cols +j] << " ";
88 }
89 cout << endl;
90 }
91 }
92 #endif
task5.cpp
1 #include <iostream>
2 #include "matrix.hpp"
3 int main()
4 {
5 using namespace std;
6 double x[] = {3, 2, 1, 8, 9, 7};
7 Matrix m1(3, 2); // 创建一个3×2的矩阵
8 m1.set(x); // 用一维数组x的值按行为矩阵m1赋值
9 m1.print(); // 打印矩阵m1的值
10 cout << "the first line is: " << endl;
11 cout << m1.at(0, 0) << " " << m1.at(0, 1) << endl; // 输出矩阵m1第1行两个元素的值
12 cout << endl;
13 Matrix m2(2, 3);
14 m2.set(x);
15 m2.print();
16 cout << "the first line is: " << endl;
17 cout << m2.at(0, 0) << " " << m2.at(0, 1) << " " << m2.at(0, 2) << endl;
18 cout << endl;
19 Matrix m3(m2); // 用矩阵m2构造新的矩阵m3
20 m3.set(0, 0, 10); // 将矩阵m3第0行第0列元素值设为10
21 m3.print();
22 }