实验三

动态数组类

头文件

#ifndef VECTOR_INT_HPP
#define VECTOR_INT_HPP

#include<iostream>

class Vector_int
{
public:
    Vector_int(int n);//指定数组对象大小
    Vector_int(int n, int value);
    Vector_int(const Vector_int& x);//复制构造函数
    ~Vector_int();
    void at(int a=0);
private:
    int size;
    int* p;
};
Vector_int::Vector_int(int n)
{
    size = n;
    std::cout << "create size" << std::endl;
    p = new int[n];
    for (auto i = 0; i < size; ++i)
        p[i] = 0;
}
Vector_int::Vector_int(int n, int value):size{n}
{
    p = new int[n];
    for (auto i = 0; i < size; ++i)
        p[i] = value;
    std::cout << "create size and initialize" << std::endl;
}
Vector_int::Vector_int(const Vector_int& x)//深度复制
{
    size = x.size;
    p = new int[size];
    for (auto i = 0; i < size; ++i)
        p[i] = x.p[i];
    std::cout << "create size and initialize" << std::endl;
}
Vector_int::~Vector_int()
{
    std::cout << "delete……" << std::endl;
    delete[] p;
}
void Vector_int::at(int a)
{
    std::cout << p[a] << std::endl;
}
#endif

主函数

#include<iostream>
#include "Vector_int.hpp"
int main()
{
    using namespace std;
    Vector_int x0(5);
    cout<<"x0.at(0)=";
    x0.at(0);
    
    Vector_int x1(5,6);
    cout << "x1.at(1)=";
    x1.at(1);


    Vector_int y(x1);
    cout << "y.at(0)=";
    y.at(0);

}

运行图

 

 动态矩阵类

头文件

#ifndef MATRIX_HPP
#define MATRIX_HPP

class Matrix
{
public:
    Matrix(int n=1);//n*n矩阵
    Matrix(int n=1, int m=1);//n*m矩阵
    Matrix(const Matrix& x);
    ~Matrix();
    void set(const double* pvalue);
    void set(int i, int j, int value);
    double& at(int i, int j);
    double at(int i, int j)const;
    int get_lines()const { return lines; }
    int get_cols()const { return cols; }
    void print()const;
public:
    int lines;
    int cols;
    double *p;
};
Matrix::Matrix(int n):lines{ n }, cols{ n }
{
    p = new double[lines*cols];
    
}
Matrix::Matrix(int n, int m) : lines{ n }, cols{ m }
{
    p = new double[lines * cols];
}
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; ++i)
        for (auto j = 0; j < cols; ++j)
            p[i * cols + j] = pvalue[i * cols + j];
}
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];
}
void Matrix::print()const
{
    for (auto i = 0; i < lines; ++i)
    {
        for (auto j = 0; j < cols; ++j) 
        {
            std::cout << p[i * cols + j] << " ";
        }
        std::cout << "\n";
    }        
}

#endif

主函数

#include<iostream>
#include "Matrix.hpp"

int main()
{
    using namespace std;

    double x[] = { 1,2,3,4,5,6 };

    Matrix m1(3, 2);
    m1.set(x);
    m1.print();
    cout << "the first line is:" << endl;
    cout << m1.at(0, 0) << " " << m1.at(0, 1) << endl;
    cout << endl;

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

    Matrix m3(m2);
    m3.set(0, 0, 999);
    m3.print();
}

运行图