实验六

实验四

#include<iostream>
#include<cassert>

using std::cout;
using std::endl;
template<class T>
class Vector {
public:
    Vector(int n, int m);
    Vector(int n);
    Vector(const Vector<T>& a);
    ~Vector();
    friend void output(Vector<T>& p1) {
        for (int i = 0; i < p1.size; i++)
        {
            cout << p1.p[i] << ",";
        }
        cout << endl;
    }
    T& at(int index) {
        return p[index];
       
    }
    T& operator[](int i)
    {
        return p[i];
    }
private:
    int size;
    T* p;
};
template<class T>
Vector<T>::Vector(int n) :size(n) {
    cout << "constructor 1 called." << endl;
    p = new T[size];
    int m = 1;
    for (int i = 0; i < size; i++)
    {
        p[i] = m;
    }
};
template<class T>
Vector<T>::Vector(int n, int m) :size(n) {

    p = new T[size];
    for (int i = 0; i < size; i++)
    {
        p[i] = m;
    }
};
template<class T>
Vector<T>::Vector(const Vector<T>& a) :size{ a.size }
{
    cout << "constructor 2 called." << endl;
    cout << "copy constructor called." << endl;
    p = new T[size];
    for (int i = 0; i < size; i++)
    {
        p[i] = a.p[i];
    }
}
template<class T>
Vector<T>::~Vector()
{
    delete[] p;
}

实验五

#include<iostream>
#include<fstream>
#include<iomanip>

using namespace std;
void output(std::ostream& out) {
    int j = 26;
    out << "  ";
    for (int i = 97; i < 123; i++) {
        out << setw(2) << char(i);
    }
    out << endl;
    for (int i = 1; i < 27; i++) {
        out << setw(2) << i;
        j++;
           for (int k = j; k < j + 26; k++) {
               int a = k % 26 + 65;
                out << setw(2) << char(a);
        }
            out << endl;
    }
}int main() {
    ofstream out;
    output(cout);
    out.open("cipher_key.txt");
    output(out);
    out.close();
    return 0;

}