实验6 模板类、文件I/O和异常处理

task4

vector.hpp

#include <iostream>
#include <stdexcept>
using namespace std;

template <typename T>
class Vector {
private:
    T* data;
    int size;
public:
    Vector() : data(nullptr), size(0) {}
    Vector(int n) : size(n) {
        data = new T[n];
        for (int i = 0; i < n; i++) {
            data[i] = T();
        }
    }
    Vector(const Vector& other) : size(other.size) {
        data = new T[size];
        for (int i = 0; i < size; i++) {
            data[i] = other.data[i];
        }
    }
    Vector(int n, T t):size{n} {
    data= new T[n];
    for (int i = 0; i < n; i++)
         data[i] = t;
 }
    ~Vector() {
        delete[] data;
    }
    int get_size() const {
        return size;
    }
    T& at(int i) {
        if (i < 0 || i >= size) {
            throw out_of_range("Index out of range");
        }
        return data[i];
    }
    T& operator[](int i) {
        return at(i);
    }
    friend void output(const Vector& v) {
        for (int i = 0; i < v.size; i++) {
            cout << v.data[i] << " ";
        }
        cout << endl;
    }
};

task4.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 * 0.618;

    output(x1);

    Vector<int> x2(n, 777);
    Vector<int> x3(x2);

    output(x2);
    output(x3);

    x2.at(0) = 42;
    output(x2);

    x3[0] = 666;
    output(x3);
}

int main() {
    test();
}

运行结果

task5

#include<iostream>
#include<fstream>

void output(std::ostream &out) {
    for (int i = 0; i <= 26; i++) {
        out.width(2);
        if (i == 0) out << ' ';
        else out << i;
        for (int j = 0; j <= 26; j++) {
            out << ' ';
            if (i == 0) out << (char)('a' + (i + j) % 26);
            else out << (char)('A' + (i + j) % 26);
        }
        out << '\n';
    }
}
void output() {
    output(std::cout);
    std::ofstream ofile;
    ofile.open("cipher_key.txt");
    output(ofile);
    ofile.close();
}
int main() {
    output();
}