实验三：类与对象二

实验4：

vector_int.hpp:

#include <iostream>
#include <cassert>
using namespace std;
class vector_int{
    public:
    vector_int(int x,int y=1):m(x),n(y){
        p=new int[m];
        for(int i=0;i<m;i++)
        {
            p[i]=n;
        }
        cout<<"consructor vector"<<endl;
    }    
    ~vector_int(){
        cout<<"destructor vector"<<endl;
    }
    vector_int (vector_int &t):m(t.m),n(t.n){
        p=new int[m];
        for(int i=0;i<n;i++)
        {
            p[i]=n;
        }
        cout<<"copy vector"<<endl;
    }
    void show();
    int &at(int c){
        return p[c];
    }
    private:
    int m,n;
    int *p;
};
void vector_int::show(){
    for(int i=0;i<m;i++)
    {
        cout<<p[i]<<" ";
    }
    cout<<endl;
}

task4.cpp:

#include <iostream>
#include "vector_int.hpp"
int main()
{
    using namespace std;
    int n;
    cin>>n;
    vector_int x(n);
    x.show();
    vector_int x1(n,6);
    x1.show();
    vector_int y(x1);
    y.show();
    y.at(0)=999;
    x1.show();
    y.show();
}

实验结果：

 

 实验五：

matrix.hpp:

#ifndef MATRIX_H
#define MATRIX_H


#include <iostream>

using namespace std;
class Matrix
{
public:    
    Matrix(int n);
    Matrix(int n,int m);
    Matrix(const Matrix &x);
    ~Matrix();
    void set(const double *pvalue);
    void set(int i,int j,int value);
    double &at(int i,int j);
    double at(int i,int j)const;
    int get_lines()const;
    int get_cols()const;
    void print()const;    
private:
    int lines;
    int cols;
    double *p;
} ;
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];
    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_cols()const{
    return cols;
}
int Matrix::get_lines()const{
    return lines;
}
void Matrix::print()const{
   for(int i=0;i<lines;i++)
   {
        for(int m=0;m<cols;m++)
        {
          cout<<p[i*cols+m]<<",";    
     }
     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);
    m1.set(x);
    m1.print();
    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();
}

实验结果：