实验4 类与数组、指针

实验五

vectorint.h

#pragma once

#include<iostream>

using namespace std;

class vectorInt {
public:
	int s, * p;

	vectorInt(int m)
	{
		p = new int [m];
		s = m;
		cout << "constructor 1 called." << endl;
	}
	vectorInt(int m, int value)
	{
		p = new int [m];
		s = m;
		for (int i = 0;i < m;i++)
			p[i] = value;
		cout << "constructor 2 called." << endl;
	}
	vectorInt(const vectorInt& x)
	{
		s = x.s;
		p = new int[s];
		for (int i = 0;i < s;i++)
			p[i] = x.p[i];
		cout << "copy constructor called." << endl;
	}
	~vectorInt()
	{
		delete[] p;
		cout << "destructor called" << endl;
	}

	int &at(int m)
	{
		return p[m];
	}
	int get_size()
	{
		return s;
	}

	friend void output(const vectorInt& x)
	{
		for (int i = 0;i < x.s;i++)
			cout << x.p[i] << ",";
		cout << "\b" <<" " << endl;
	}
};

　　task

#include <iostream>
#include "vectorint.h"
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();
}

实验六

Matrix.h

#pragma once

#include <iostream>

using std::cout;
using std::endl;

class Matrix {
public:
	Matrix(int n)
	{
		lines = n;
		cols = n;
		p = new double[lines * cols];
	}
	Matrix(int n, int m)
	{
		lines = n;
		cols = m;
		p = new double[lines * cols];
	}
	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()
	{
		delete[] p;
	}

	void set(const double* pvalue)
	{
		for (int i = 0;i < lines * cols;i++)
		{
			p[i] = *pvalue;
			pvalue++;
		}
	}
	void set(int i, int j, int value)
	{
		p[i * cols + j] = value;
	}
	double& at(int i, int j)
	{
		return p[i * cols + j];
	}
	double at(int i, int j) const
	{
		return p[i * cols + j];
	}
	int get_lines() const
	{
		return lines;
	}
	int get_cols() const
	{
		return cols;
	}
	void print() const
	{
		for (int i = 0;i < lines * cols;i++)
		{
			cout << p[i] << ",";
			if ((i+1) % cols == 0)
				cout << "\b" << " " << endl;
		}
	}
private:
	int lines; 
	int cols; 
	double* p; 
};

　　task

#include <iostream>
#include "Matrix.h"
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();
}