实验六

#include <iostream>
#include "vector.hpp"
void test()
{
    using namespace std;
    int n;
    cin >> n;

    Vector<double> x1(n);
    for (auto i = 0; i < n; ++i)
        x1.at(i) = i * 0.7;

    output(x1);

    Vector<int> x2(n, 42);
    Vector<int> x3(x2);

    output(x2);
    output(x3);

    x2.at(0) = 77;
    output(x2);

    x3[0] = 999;
    output(x3);
}

int main()
{
    test();
}

#include<iostream>
#include<stdexcept>
#include <cassert>
using namespace std;
template<typename T>
class Vector
{
private:
    int size;
    T* ptr;
public:

    Vector(int size)
    {
        if (size < 0)
            throw std::length_error("vector constructor:negative size");
        this->size = size;
        ptr = new T[this->size];
    }
    Vector(int size, T value)
    {
        if (size < 0)
            throw std::length_error("vector constructor:negative size");
        this->size = size; ptr = new T[size];
        for (auto i = 0; i < size; i++)
        {
            ptr[i] = value;
        }

    }
    Vector(const Vector<T>& x)
    {
        size = x.size;
        ptr = new T[size];
        for (auto i = 0; i < size; i++)
        {
            ptr[i] = x.ptr[i];
        }
    }
    ~Vector()
    {
        delete[] ptr;
    }
    int get_size() { return size; }
    T& at(int i)
    {
        assert(i >= 0 && i < size);
        return(ptr[i]);
    }
    T& at(int i) const
    {
        assert(i >= 0 && i < size);
        return(ptr[i]);
    }
    T& operator[](int i)
    {
        return ptr[i];
    }
    friend void output(Vector<T> x)
    {
        for (auto i = 0; i < x.get_size(); i++)
            cout << x.at(i) << ",";
        cout << "\b\b\n";
    }
};

#include<fstream>
#include<iostream>
#include<stdexcept>
#include<string>
#include <iomanip>
using namespace std;
void output(ostream& out)
{
    int i, j;
    string a[27][27];
    for (i = 0;i < 27;i++)
    {
        for (j = 0;j < 27;j++)
        {
            if (i == 0 && j == 0)
            {
                a[i][j] = ' ';
                out << a[i][j];
            }
            else if (i == 0)
            {
                a[i][j] = 'a' + j - 1;
                out << a[i][j];
            }
            else if (j == 0)
            {
                a[i][j] = '1' + i - 1;
                out << i;
            }
            else
            {
                a[i][j] = 'A' + (i + j + 26) % 26;
                out << a[i][j];
            }
        }
    }
}
int main()
{
    cout << setiosflags(ios::left);
    int i, j;
    string a[27][27];
    for (i = 0;i < 27;i++)
    {
        for (j = 0;j < 27;j++)
        {
            if (i == 0 && j == 0)
            {
                a[i][j] = ' ';
                cout << a[i][j] << "  ";
            }
            else if (i == 0)
            {
                a[i][j] = 'a' + j - 1;
                cout << a[i][j] << "  ";
            }
            else if (j == 0)
            {
                a[i][j] = '1' + i - 1;
                cout << i << "\t\b\b\b\b\b";
            }
            else
            {
                a[i][j] = 'A' + (i + j + 26) % 26;
                cout << a[i][j] << "  ";
            }
        }
        cout << endl;
    }
    cout << endl;
    ofstream out;
    out.open("cipher_key.txt");
    if (!out.is_open())
    {
        std::cout << "fail to open file " << std::endl;
        return 0;
    }
    output(out);
    out.close();

}