实验三 类和对象Ⅱ

//Vector_int.hpp
#ifndef VECTOR_INT_H
#define VECTOR_INT_H

#include<iostream>
#include<cassert>
using std::cout;
using std::endl;
class Vector_int
{
private:
    int size;
    int* p;
public:
    Vector_int(int n);
    Vector_int(int n, int value);
    Vector_int(const Vector_int& x);
    ~Vector_int();
    int& at(int index);
    void show();
};

Vector_int::Vector_int(int n) :size(n)
{
    cout << "调用构造函数" << endl;
    p = new int[n]();
    
}
Vector_int::Vector_int(int n, int value) : size(n)
{
    cout << "调用构造函数" << endl;
    p = new int[n];
    for (auto i = 0; i < size; ++i)
        p[i] = value;
}
Vector_int::Vector_int(const Vector_int& x):size(x.size)
{
    cout << "调用复制构造函数" << endl;
    p = new int[size];
    for (auto i = 0; i < size; ++i)
        p[i] = x.p[i];
}
Vector_int::~Vector_int()
{
    cout << "调用析构函数" << endl;
    delete[]p;
}
int& Vector_int::at(int index)
{
    assert(index <= 0 && index < size);
    return p[index];
}
void Vector_int::show()
{
    for (auto i = 0; i < size; ++i)
        cout << p[i] << ",";
    cout << "\b\b\n";
}
#endif

//task4.cpp
#include<iostream>
#include"Vector_int.hpp"
using namespace std;
int main()
{
    int n;
    cin >> n;
    Vector_int x(n);
    x.show();
    Vector_int x1(n, 6);
    x1.show();
    Vector_int y(x);
    y.show();
    y.at(0) = 999;
    y.show();
}

 

//Matrox.hpp
#ifndef MATRIX_H
#define MATRIX_H

#include<iostream>

class Matrix
{
private:
    int lines;//矩阵行数
    int cols;//矩阵列数
    double* p;//指向存放矩阵数据的内存块的首地址
public:
    Matrix(int n);//构造函数，构造一个n*n的矩阵
    Matrix(int n, int m);//构造函数，构造一个n*m的矩阵
    Matrix(const Matrix& x);//复制构造函数，使用已有的矩阵x构造
    ~Matrix();//析构函数
    void set(const double* pvalue);//用pvalue指向的连续内存块数据按行为矩阵赋值
    void set(int i, int j, int value);//设置矩阵的第i行第j列元素值为value
    double &at(int i, int j);//返回矩阵第i行第j列元素的引用
    double at(int i, int j)const;//返回矩阵第i行第j列的元素
    int get_lines()const;//返回矩阵行数
    int get_cols()const;//返回矩阵列数
    void print()const;//按行打印输出矩阵
};
Matrix::Matrix(int n) :lines(n), cols(n)
{
    p = new double[n * n];
}
Matrix::Matrix(int n, int m) : lines(n), cols(m)
{
    p = new double[n * m];
}
Matrix::Matrix(const Matrix& x) : lines(x.lines), cols(x.cols)
{
    p = new double[lines * cols];
    for (auto i = 0; i < lines * cols; ++i)
        p[i] = x.p[i];
}
Matrix::~Matrix()
{
    delete[]p;
}
void Matrix::set(const double* pvalue)
{
    for (auto i = 0; i < lines * cols; ++i)
        p[i] = pvalue[i];
}
void Matrix::set(int i, int j, int value)
{
    p[i * cols + j] = value;
}
double& Matrix::at(int i, int j)
{
    return p[i * cols + j];
}
double Matrix::at(int i, int j)const
{
    return p[i * cols + j];
}
int Matrix::get_lines()const
{
    return lines;
}
int Matrix::get_cols() const
{
    return cols;
}
void Matrix::print() const
{
    for (int i = 0; i < lines; ++i)
    {
        for(int j=0;j<cols;++j)
        {
            std::cout << p[i * cols + j] << ",";
        }
        std::cout << "\b\b\n";
    }
}
#endif

//task5.cpp
#include<iostream>
#include"Matrix.hpp"

int main()
{
    using namespace std;

    double x[] = { 1,2,3,4,5,6 };
    Matrix m1(3, 2);//创建一个3*2的矩阵
    m1.set(x);//用一维数组x的值按行为矩阵m1赋值
    m1.print();
    cout << "the first line is:" << endl;
    cout << m1.at(0, 0) << " " << m1.at(0, 1) << endl;//输出矩阵m1第一行两个元素的值
    cout << endl;

    Matrix m2(2, 3);
    m2.set(x);
    m2.print();
    cout << "the first line is:" << endl;
    cout << m2.at(0, 0) << " " << m2.at(0, 1) << " " << m2.at(0, 2) << endl;
    cout << endl;

    Matrix m3(m2);//用矩阵m2构造新的矩阵m3
    m3.set(0, 0, 999);//将矩阵m3第0行第0列元素的值设为999
    m3.print();
}