实验6 模板类、文件I/O和异常处理

实验任务4

Vector.hpp

#ifndef VECTOR_HPP
#define VECTOR_HPP

#include <iostream>
#include <stdexcept>

template <typename T>
class Vector;

template <typename U>
void output(const Vector<U>& vec);

template <typename T>
class Vector {
private:
    T* elements;
    size_t size;

public:
    Vector(size_t size) : size(size) {
        elements = new T[size];
    }

    Vector(size_t size, const T& value) : size(size) {
        elements = new T[size];
        for (size_t i = 0; i < size; ++i) {
            elements[i] = value;
        }
    }

    Vector(const Vector& other) : size(other.size) {
        elements = new T[size];
        for (size_t i = 0; i < size; ++i) {
            elements[i] = other.elements[i];
        }
    }

    ~Vector() {
        delete[] elements;
    }

    size_t get_size() const {
        return size;
    }

    T& at(size_t index) {
        if (index >= size) {
            throw std::out_of_range("越界");
        }
        return elements[index];
    }

    T& operator[](size_t index) {
        if (index >= size) {
            throw std::out_of_range("越界");
        }
        return elements[index];
    }

    friend void output<T>(const Vector<T>& vec);
};

template <typename U>
void output(const Vector<U>& vec) {
    for (size_t i = 0; i < vec.size; ++i) {
        std::cout << vec.elements[i] << " ";
    }
    std::cout << std::endl;
}

#endif

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 * 0.7;

    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();
}

 

实验任务5 

task5.cpp

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

void output(std::ostream& output)
{
output << " ";
for (int i = 97; i < 123; i++)
{
output << setw(2) << char(i);
}
output << endl;

for (int i = 1; i <= 26; i++)
{
output << setw(2) << i;
int j;
for (j=i;j<i+26;j++)
{
output<<setw(2)<<char(65+j%26);
}
output << endl;
}
}

int main()
{
ofstream out;
output(cout);
out.open("cipher_key.txt");
output(out);
return 0;
}