实验三 类与对象2

任务四

 

vector_hpp

#ifndef VECTOR_INT_HPP
#define VECTOR_INT_HPP

#include <iostream>
using namespace std;

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

Vector_int::Vector_int(int size,int v)
{
    n=size;
    value=v;
    p = new int[n];
    for(int i=0;i<n;i++){
        p[i] = value;
    }
    cout << "调用构造函数" << endl;
}//构造函数

Vector_int::Vector_int(Vector_int &v)
{
    n=v.n;
    value=v.n;
    p = new int[n];
    for(int i=0;i<n;i++){
        p[i] = value;
    }
    cout << "调用复制构造函数" << endl;
}//复制构造函数

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

void Vector_int::print(){
    for(int i=0;i<n;i++){
        cout << p[i];
        if(i!=n-1){
            cout << ",";
        }else{
            cout << endl;
        }
    }
    return;
}

Vector_int::~Vector_int(){
    delete[] p;
    cout << "调用析构函数" << endl;
}//析构函数


#endif

task3.hpp

#include "Vector_int.hpp"
#include <iostream>
using namespace std;
int main(){

　Vector_int x1(3);
　x1.print();

　Vector_int x2(5, 4);
　x2.print();

　Vector_int y(x2);

　y.print();

　y.at(0) = 500;
　y.print();

return 0;

}

 

 

 

任务五

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 = 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)
{
    int sum = X.lines * X.cols;
    p = new double[sum];
    for (int i = 0; i < sum; 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)
{
    int k = i * cols + j;
    assert(k >= 0 && k < lines* cols);
    return p[k];
}

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++)
            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: \n";
    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: \n";
    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();
}