实验三

 

#pragma once
#include<iostream>

class Vector_int
{
public:
    Vector_int(int n);
    Vector_int(int n, int m);
    Vector_int(Vector_int& x);
    int &at(int i);
    void print()const;
    ~Vector_int();
private:
    int* p;
    int size;
};

Vector_int::Vector_int(int n):size{n}
{
    p = new int[size]();
    std::cout << "constructor called." << std::endl;
}

Vector_int::Vector_int(int n, int m):size{n}
{
    p = new int[size]();
    for (int i = 0;i < size;i++)
        p[i] = m;
    std::cout << "constructor called." << std::endl;
}

Vector_int::Vector_int(Vector_int& x)
{
    size = x.size;
    p = new int[x.size]();
    for (int i = 0;i < x.size;i++)
        p[i] = x.p[i];
    std::cout << "constructor called." << std::endl;
}

int& Vector_int::at(int i)
{
    return p[i];
}

void Vector_int::print()const
{
    for (int i = 0;i <size;i++)
        std::cout << p[i] << ' ';
    std::cout << std::endl;
}

Vector_int::~Vector_int()
{
    delete[] p;
    std::cout << "configurator called." << std::endl;
}

 

task4.cpp

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

int main()
{
    using namespace std;
    int n=8;
    cout << "n=" << n << endl;
    Vector_int x1(n);
    x1.print();

    Vector_int x(n, 6);
    x1.print();

    Vector_int y(x);

    y.at(0) = 999;
    
    y.print();

}

运行截图

 实验任务5

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

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

Matrix::Matrix(const Matrix& x) : lines{ x.lines }, cols{ x.cols }
{
    p = new double[lines * cols];
    for (int 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 j = 0;
    for (int i = 0;i < lines * cols;i++)
    {
        if (j == cols)
        {
            std::cout << std::endl;
            j = 0;
        }
        std::cout << p[i] <<' ';
        j++;
    }
    std::cout << std::endl;
}
#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();         // 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();
}

运行截图