实验4

实验任务5

#pragma once
#include<iostream>
#include<cassert> 
using namespace std;
class vectorInt {
public:
    vectorInt(int n);
    vectorInt(int n, int value);
    vectorInt(const vectorInt&);
    ~vectorInt();
    int& at(int t) { return p[t]; }
    int get_size() { return size; }
    friend void output(vectorInt& p1);
private:
    int size;
    int* p;
};
vectorInt::vectorInt(int n) :size{ n } {
    cout << "constructor 1 called" << endl;
    p = new int[n];
}
vectorInt::vectorInt(int n, int value) :size{ n } {
    cout << "constructor 2 called" << endl;
    p = new int[n];
    for (auto i = 0; i < n; i++) {
        p[i] = value;
    }
}
vectorInt::vectorInt(const vectorInt& vi) :size{ vi.size }
{
    p = new int[size];
    cout << "copy constructor called." << endl;
    for (auto i = 0; i < vi.size; i++)
    {
        p[i] = vi.p[i];
    }
}
void output(vectorInt& p1)
{
    for (auto i = 0; i < p1.size - 1; ++i) {
        cout << p1.at(i) << ",";
    }
    cout << p1.at(p1.size - 1) << endl;
}
vectorInt::~vectorInt() {
    cout << "destructor called." << endl;
    delete[] p;
}

#include<iostream>
#include"标头.hpp"
void test() {
    using namespace std;
    int n;
    cin >> n;
    vectorInt x1(n);
    for (auto i = 0; i < n; ++i)
        x1.at(i) = i * i;
    output(x1);
    vectorInt x2(n, 42);
    vectorInt x3{ x2 };
    output(x2);
    output(x3);
    x2.at(0) = 77;
    output(x2);
    output(x3);
}
int main()
{
    test();
}

实验任务6

#pragma once
#include<iostream>
using std::cout;
using std::endl;
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[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; i++)
    {
        for (int j = 0; j < cols; j++)
        {
            p[i * cols + j] = x.p[i * cols + j];
        }
    }
}
Matrix::~Matrix()
{
    delete[] p;
}
void Matrix::set(const double* pvalue) {
    for (int i = 0; i < lines; i++)
    {
        for (int j = 0; j < cols; j++)
        {
            p[i * cols + j] = *pvalue;
            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;
}
int Matrix::get_cols()const {
    return cols;
}
void Matrix::print()const {
    for (int i = 0; i < lines; i++)
    {
        for (int j = 0; j < cols - 1; j++)
        {
            cout << p[i * cols + j] << ",";
        }
        cout << p[i * cols + cols - 1] << endl;
    }
}

#include<iostream>
#include"标头.hpp"
void test() {
    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();
}
int main()
{
    test();
}