实验6

#include<fstream>
#include<iostream>
#include<bits/stdc++.h>

using namespace std;

void output(ofstream &out, string To = "con"){

    out.open(To);
    
    if(!out.is_open()){
        cout << "open fail!!\n";
        return ;
    }

    out << "  ";
    for(char c = 'a'; c <= 'z'; c ++)
        out << ' ' << c;
    out << endl;
    
    for(int i = 1; i <= 26; i ++){
        out << setw(2) << i;
        for(int j = 1; j <= 26; j ++)
            out << ' ' << (char)((j+ i - 1) % 26 + 'A');
        out << endl;
    }

    out.close();
}

int main(){
    
    ofstream out;
    
    output(out);
    output(out, "cipher_key.txt");
}

 hpp

#pragma once
#include<iostream>
#include<cassert>

using namespace std;

// delaration of template class
template<typename T>
class Vector {
public:
    Vector(int n) :size{ n } {
        p = new T[n];
    }

    Vector(int n, T value) :size{ n } {
        p = new T[n];
        for (int i = 0; i < size; i++) {
            p[i] = value;
        }
    }

    Vector(const Vector& v) :size{ v.size } {
        p = new T[size];
        for (int i = 0; i < size; i++) {
            p[i] = v.p[i];
        }
    }

    ~Vector() {
        delete[] p;
    }

    int get_size() { 
        return size; 
    }

    T& at(int index) {
        assert(index >= 0 && index < size);
        return p[index];
    }

    T& operator[](int index) {
        assert(index >= 0 && index < size);
        return p[index];
    }

    template<typename T1>
    friend void output(const Vector<T1>& v);
private:
    int size;
    T* p;
};

template<typename T1>
void output(const Vector<T1>& v) {
    for (int i = 0; i < v.size; i++) {
        cout << v.p[i] << " ,";
    }
    cout << endl;
}

　　cpp

#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();
}