实验三类与对象2

task4:

vector_int.hpp

#include<iostream>
using namespace std;

class vector_int{
    public:        
        ~vector_int(){
            delete a;
            show();
        }
        vector_int(int n){
            size = n;
               a = new int[size];
            show();
        }
        vector_int(int n,int t){
            size = n;
            a = new int[size];
            for(int i = 0; i < size; i++)
            a[i] = t;
            show();
        }
        vector_int(const vector_int &obj){
            size = obj.size;
            a = new int[size];
            for(int i = 0; i < size; i++)
            a[i] = obj.a[i]; 
            show();
        }
        void show(){
               cout << "size: " << size << endl;
              cout << "data:" << endl;
                for(int i = 0; i < size; i++)
            cout << a[i] << ' ';
               cout << endl;    
            }
        int &at(int t){
            return a[t];
        }

    private:
        int size;
        int *a; 
};

task4.cpp

#include<iostream>
#include"vector_int.hpp"
using namespace std;

int main()
{
    int n,t;
    cin >> n >> t;
    vector_int x(n);
    vector_int y(n,t);
    vector_int z(y);
    z.at(1) = 999;
    cout << z.at(1) << endl;
    return 0;
}

 

 task5:

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[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;
    p=new double[lines*cols];
    for(int i = 0; i < lines * cols; i++)
        p[i] = X.p[i];
}

Matrix::~Matrix()
{
    delete[] p; //delete[] 调用每个成员的析构函数 与new[]配套 
}

void Matrix::set(const double *pvalue)
{
    for(int i = 0; i < lines * cols; i++)
        p[i] = *(pvalue++);
}

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; //返回行数 
}

int Matrix::get_cols() const
{
    return cols; //返回列数 
}

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();
    return 0;
}