实验三 类与对象Ⅱ

#include<iostream>
#include<cassert>
using namespace std;
class vector_int{
    private:
        int q;
        int *p;
    public:
        vector_int(int Q,int P=0);
        vector_int(const vector_int &v) ;
        ~vector_int();
        void print()const;
        int &at(int b);
        
};
vector_int::vector_int(int Q,int P):q(Q)
{
    p=new int[q];
    for(int i=0;i<q;i++)
    {
        p[i]=P;
    }
    cout<<"Default Constructor called."<<endl;
}
vector_int::vector_int(const vector_int &v)
{
    q=v.q;
    p=new int[q];
    for(int i=0;i<q;i++)
    {
        p[i]=v.p[i];
    }
    cout<<"Copy Constructor called."<<endl;
    
}
vector_int::~vector_int()
{
    delete[] p;
    cout<<"Destructor called."<<endl;
}
int &vector_int::at(int b)
{
    return p[b];
}
void vector_int::print()const
{
    for(int i=0;i<q;i++)
    {
        cout<<p[i]<<" ";
    }
    cout<<"\n";
}

#include<iostream>
#include<cassert>
#include"vector_int.hpp"
using namespace std;
int main()
{
    int n;
    cin>>n;
    vector_int x1(n); 
    vector_int x2(n, 6); 
    vector_int y(x2); 
    y.at(0) = 999; 
    cout<<"x1:";
    x1.print(); 
    cout<<"x2:";
    x2.print();
    cout<<"y:";
    y.print();
}

 

#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(auto 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 j=0;j<cols;j++)
        {
            cout<<p[i*cols+j]<<",";
        }
        cout<<"\n";
    }
}

#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();
    return 0;
}