实验三 类与对象2

Vector_int.hpp:

#ifndef VERCTOR_INT_HPP
#define VERCTOR_INT_HPP

#include <cassert>
#include <iostream>
using namespace std;

class Vector_int{
	public:
    Vector_int(int n,int m = 0);
    Vector_int(const Vector_int &v);
    ~Vector_int();
    int &at(int index); 
    void print() const;
    private:
    int size; 
    int *p;
};

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

Vector_int::Vector_int(const Vector_int &v) : size(v.size)
{
    p = new int[size];
    for(auto i=0; i<size; ++i)
        p[i] = v.p[i];
}

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

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

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

task4.cpp:

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

int main()
{
	using namespace std;
	int n;
	cin >> n;
	Vector_int x(n);
	Vector_int x1(n,6);
	Vector_int y(x1);
	y.at(0) = 999;
	cout << "x：";
	x.print();
	cout << "x1：";
	x1.print();
	cout << "y：";
	y.print();
}

　运行结果：

 

Matrix.hpp:

#ifndef MATRIX_H
#define MATRIX_H

#include <iostream>
#include <cassert>
using namespace std;

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 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];
}

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_cols() const
{
	return cols;
}

int Matrix::get_lines() const
{
	return lines;
}

void Matrix::print() const
{
	for(int i = 0;i < lines;i++)
	{
		for(int j = 0;j < cols;j++)
		{
			cout << p[i*cols + j] << ",";
		}
		cout << 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();
}

运行结果：