实验任务4
1 #ifndef VECTOR_INT_HPP
2 #define VECTOR_INT_HPP
3 #include <iostream>
4 #include <cassert>
5 using namespace std;
6 class Vector_int
7 {
8 public:
9 Vector_int(int n);
10 Vector_int(int n,int v);
11 Vector_int(const Vector_int &x);
12 ~Vector_int()
13 {
14 cout<<"deleting..."<<endl;
15 delete[] p;
16 };
17 int &at(int index);
18 private:
19 int size;
20 int value;
21 int index;
22 int *p;
23 };
24 Vector_int::Vector_int(int n):size(n)
25 {
26 cout<<"dynamic create array..."<<endl;
27 p=new int[n];
28 for(int x=0;x<size;x++)
29 {
30 p[x]=0;
31 }
32 }
33 Vector_int::Vector_int(int n,int v):size(n),value(v)
34 {
35 cout<<"dynamic create array with value..."<<endl;
36 p=new int[n];
37 for(int x=0;x<size;x++)
38 {
39 p[x]=value;
40 }
41 }
42 Vector_int::Vector_int(const Vector_int &x):size(x.size)
43 {
44 cout<<"deep-copy create array..."<<endl;
45 p=new int[size];
46 for(int i=0;i<size;i++)
47 {
48 p[i]=x.p[i];
49 }
50 }
51 int &Vector_int::at(int index)
52 {
53 assert(index>=0&&index<size);
54 return p[index];
55 }
56 #endif
1 #include <iostream>
2 #include "vector_int.hpp"
3 /* run this program using the console pauser or add your own getch, system("pause") or input loop */
4 using namespace std;
5
6 int main() {
7 int n;
8 cout<<"请输入n的值："<<endl;
9 cin>>n;
10 Vector_int x(n);
11 cout<<"x.at(0)="<<x.at(0)<<endl;
12 Vector_int z(n,6);
13 cout<<"z.at(0)="<<z.at(0)<<endl;
14 Vector_int y(x);
15 y.at(0)=999;
16 cout<<"y.at(0)="<<y.at(0)<<endl;
17 }
实验任务5
1 #ifndef MATRIX_H
2 #define MATRIX_H
3
4 #include <iostream>
5 #include <cassert>
6
7 class Matrix
8 {
9 public:
10 Matrix(int n); // 构造函数，构造一个n*n的矩阵
11 Matrix(int n, int m); // 构造函数，构造一个n*m的矩阵
12 Matrix(const Matrix &X); // 复制构造函数，使用已有的矩阵X构造
13 ~Matrix(){delete[] p;}; //析构函数
14 void set(const double *pvalue); // 用pvalue指向的连续内存块数据为矩阵赋值
15 void set(int i, int j, int value); //设置矩阵第i行第j列元素值为value
16 double &at(int i, int j); //返回矩阵第i行第j列元素的引用
17 double at(int i, int j) const; // 返回矩阵第i行第j列元素的值
18 int get_lines() const; //返回矩阵行数
19 int get_cols() const; //返回矩列数
20 void print() const; // 按行打印输出矩阵
21 private:
22 int lines; // 矩阵行数
23 int cols; // 矩阵列数
24 double *p; // 指向存放矩阵数据的内存块的首地址
25 };
26
27 Matrix::Matrix(int n):lines(n),cols(n)
28 {
29 p=new double[lines*cols];
30 }
31
32 Matrix::Matrix(int n,int m):lines(n),cols(m)
33 {
34 p=new double[lines*cols];
35 }
36
37 Matrix::Matrix(const Matrix &X):lines(X.lines),cols(X.cols)
38 {
39 p=new double[lines*cols];
40 for (auto i=0;i<lines*cols;i++)
41 {
42 p[i]=X.p[i];
43 }
44 }
45
46 void Matrix::set(const double *pvalue)
47 {
48 int x=0;
49 for (auto i=0;i<lines*cols;i++)
50 {
51 p[i]=pvalue[x++];
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 using namespace std;
83 for(int i=0;i<lines*cols;i++)
84 {
85 cout<<p[i];
86 if((i+1)%cols==0&&i!=0)
87 {
88 cout<<endl;
89 }
90 else
91 {
92 cout<<",";
93 }
94 }
95 }
96 #endif
1 #include <iostream>
2 #include "matrix.hpp"
3
4 int main()
5 {
6 using namespace std;
7
8 double x[] = {2,4,6,8,10,12};
9
10 Matrix m1(3, 2); // 创建一个3×2的矩阵
11 m1.set(x); // 用一维数组x的值按行为矩阵m1赋值
12 m1.print(); // 打印矩阵m1的值
13 cout << "the first line is: " << endl;
14 cout << m1.at(0, 0) << " " << m1.at(0, 1) << endl;
15 cout << endl;
16
17 Matrix m2(2, 3);
18 m2.set(x);
19 m2.print();
20 cout << "the first line is: " << endl;
21 cout << m2.at(0, 0) << " " << m2.at(0, 1) << " " << m2.at(0, 2) << endl;
22 cout << endl;
23
24 Matrix m3(m2);
25 m3.set(0, 0, 888);
26 m3.print();
27 }
