实验六 模板类和文件IO

1.1 Vector.hpp:

#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

template <class T>
class Vector
{
public:
    Vector(int n) : size{n}
    {
        p = new T[size];
    }
    Vector(int n, T value) : size{n}
    {
        p = new T[size];
        int i;
        for (i = 0; i < size; i++)
            p[i] = value;
    }
    ~Vector()
    {
        delete[] p;
    }

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

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

    Vector(const Vector<T> &v1) : size{v1.size}
    {
        p = new T[size];
        int i;
        for (i = 0; i < size; i++)
            p[i] = v1.p[i];
    }

    int get_size() const { return size; }

    friend void output(Vector<T> &v)
    {
        int i;
        for (i = 0; i < v.size; i++)
            cout << v.p[i] << " ";
        cout << endl;
    }

private:
    int size;
    T *p;
};

1.2 task4.cpp:

#include <iostream>
#include "Vector.hpp"

void test()
{
    using namespace std;

    int n;
    while(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);
    }
    cin.clear();
}

int main()
{
    test();
}

1.3 运行结果：

 

2.1 task5.cpp:

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

using namespace std;
void output(ostream &out)
{
    int n = 26;
    out << "  ";
    for (auto i = 'a'; i <= 'z'; i++)
    {
        out << setw(3) << i;
    }
    out << endl;

    for (int i = 1; i <= 26; i++)
    {
        out << setw(3) << i;
        n++;
        for (int j = n; j < n + 26; j++)
        {
            int ch = j % 26 + 65;
            out << setw(2) << char(ch);
        }
        out << endl;
    }
}
int main()
{
    ofstream out;
    output(cout);
    out.open("cipher_key.txt");
    output(out);
    out.close();
}

2.2 运行结果:

2.3 cipher_key运行结果：