实验三 类和对象 II

vector_int.hpp

#include<iostream>

using namespace std;

class vector_int
{
    public:
        vector_int(int n,  int number = 0);
        vector_int(vector_int &v);
        ~vector_int()
        {
            cout<<"deleting..."<<endl;
            delete []p;
        }
        int &at(int index);
    private:
        int size;
        int *p;
}; 


vector_int::vector_int(int n,  int number)
{
    cout<<"Calling the constructor"<<endl;
    size = n;
    p = new int[size];
    for(int i = 0; i < size; i++)
        p[i] = number;
}

vector_int::vector_int(vector_int &v)
{
    cout<<"Calling the copy constructor"<<endl;
    p = new int[v.size];
    size = v.size;
    for(int i= 0; i < v.size; i++)
        p[i] = v.p[i];
}

int &vector_int::at(int index)
{
    if((index >= 0) && (index < size))
        return p[index];
}

task4.cpp

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

using namespace std;

int main()
{
    int n = 6, i;
    vector_int x(n, 6);
    // 输出X的值
    cout<<endl;
    cout<<"x的值为:"<<endl;
    for(i = 0; i< n - 1; i++)
        cout<<x.at(i)<<" ";
    cout<<x.at(i)<<endl;
    cout<<endl;
    
    // 调用复制构造函数 
    vector_int y(x);
    
    y.at(0) = 999;
    cout<<endl;
    cout<<"y的值为:"<<endl;
    for(i = 0; i< n - 1; i++)
        cout<<y.at(i)<<" ";
    cout<<y.at(i)<<endl;
    cout<<endl;
    return 0;
}

 

 

 

 

 

Matrix.hpp

#ifndef MATRIX_H
#define MATRIX_H

#include <iostream>
#include <cassert>

class Matrix
{
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为矩阵赋值
    void set(int i, int j, int value); //设置矩阵第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列元素的值
    int get_lines() const;             //返回矩阵行数
    int get_cols() const;              //返回矩列数
    void print() const;                // 按行打印输出矩阵
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
};


Matrix::Matrix(int n)
{
    p = new double[n * n];
    lines = n, cols = n;
}

Matrix::Matrix(int n, int m)
{
    p = new double[n * m];
    lines = n, cols = 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(int 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
{
    int i, j;
    for(i = 0; i < lines; i++)
    {
        for(j = 0; j < cols - 1; j++)
            std::cout<<p[i * cols + j]<<" ";
        std::cout<<p[i * cols + j]<<std::endl;
    }
}
#endif

 

task5.cpp

#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();         // 打印矩阵m1的值
    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 first 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();
}