Task4

//VEctor.hpp
#include<bits/stdc++.h>

using namespace std;

template<typename T>
class Vector{
    
private:
    
    int length;
    T * base;
    
public:
    
    Vector(const int & n, const T & x);
    Vector(const int & n);
    Vector(const Vector<T> & obj);
    ~ Vector();
    
    T & at(const int & w) const ;
    T & operator [] (const int & w) const ;
    int get_size() const;

    template<typename TT>
    friend void output(const Vector<TT> & obj);
};

template<typename T>
Vector<T>::Vector(const int & n){
    length = n;
    base = new T[n];
}

template<typename T>
Vector<T>::Vector(const int & n, const T & x){
    length = n;
    base = new T[n];
    for(int i = 0; i < n; i ++)
        base[i] = x;
}

template<typename T>
Vector<T>::Vector(const Vector<T> & obj){
    int n = obj.get_size();
    length = n;
    base = new T[n];
    for(int i = 0; i < n; i ++)
        base[i] = obj[i];
}

template<typename T>
T & Vector<T>::at(const int & w) const {
    return base[w];
}

template<typename T>
T & Vector<T>::operator [] (const int & w) const {
    return base[w];
}

template<typename T>
int Vector<T>::get_size() const {
    return length;
}

template<typename T>
Vector<T>::~Vector(){
    delete [] base;
}

template<typename TT>
void output(const Vector<TT> & obj){
    for(int i = 0; i < obj.get_size(); i ++)
        cout << obj[i] << " ";
    cout << endl;
}

//task6.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();
}

测试结果

Task5

// Task5.cpp
#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) << right << i;
        for(int drt = 1; drt <= 26; drt ++)
            out << ' ' << (char)((drt + i - 1) % 26 + 'A');
        out << endl;
    }

    out.close();
}

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

测试结果