实验三 类和对象II

实验任务4

“Vector_int.hpp"

#ifndef VECTOR_INT
#define VECTOR_INT 

#include <bits/stdc++.h>
using namespace std;


class Vector_int
{
    public:
        Vector_int(int n);
        Vector_int(int n, int value);
        Vector_int(const Vector_int &a);
        int& at(int i);
        void show();
        ~Vector_int(){ int size = 0; delete[] p;}
        
    private:
        int size;
        int *p = NULL;
 };
 
Vector_int::Vector_int(int n)
 {
     size = n;
     p = new int[size];
 }
 
 Vector_int::Vector_int(int n,int value)
 {
     size = n;
     p = new int[size];
     for(int i = 0 ;i < size; i++)
         p[i] = value;
 }
 
 Vector_int::Vector_int(const Vector_int &a)
 {
     size = a.size;
     p = new int[size];
     for(int i = 0 ;i < size; i++)
         p[i] = a.p[i];
 }
 
 int& Vector_int::at(int i)
 {
    assert( p!=NULL && i >= 0 && i < size);
    int &res = p[i];
    return res;
 }
 void Vector_int::show()
 {
     for(int i = 0; i < size; i++)
         cout << p[i] <<' ';
     cout << endl;
 }
 
 #endif

 

"task4.cpp"

#include "Vector_int.hpp"
#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n = 10;
    Vector_int x1(n);
    
    Vector_int x2(n,6);
    cout << "数组x2的值";
    x2.show();
    
    Vector_int y(x2);
    cout << "原数组y的值";
    x2.show();    

    y.at(0) = 999;
    cout << "修改后数组y的值";
    y.show();    
    
    
    
    return 0;
}

"输出结果"

 

 

实验任务五

”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;
     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++)
     {
         if(pvalue == NULL) break;
         p[i] = pvalue[i];
     }
 }

 void Matrix::set(int i, int j, int value)
 {
    p[(i-1)*lines + j-1] = value;
 }

 double& Matrix::at(int i, int j)
 {
     double &res = p[i*lines + j];
     return res;
 }
 double Matrix::at(int i, int j) const
 {
     return p[i*lines + 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*cols; i++)
     {
         cout << p[i];
         if((i+1)%cols == 0) cout << endl;
         else cout << ", ";
     }
 }
#endif

"task5.cpp"

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


int main()
{
    using namespace std;



    double x[] = {6,5,4,3,2,1};



    Matrix m1(2,3);    // 创建一个2x3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) << " " << m1.at(0,2) << endl;
    cout << endl;



    Matrix m2(3,2);
    m2.set(x);
    m2.print();
    cout << "the first line is: " << endl;
    cout << m2.at(0, 0) << " " << m2.at(0, 1) << endl;
    cout << endl;



    Matrix m3(m2);
    m3.set(0, 0, 999);
    m3.print();
}

 

"运行截图