实验6 模板类、文件I/O和异常处理

实验任务4

Vector.hpp

#pragma once

#include <iostream>
#include <stdexcept>
#include <string>

using namespace std;

template <typename T>
class Vector {
public:
    Vector (int x = 0, const T& value = T());
    Vector (const Vector& other);int get_size() const;
    
    T& at(int e);
    T& operator[](int e);
    
    template<typename T1>
    friend void output (const Vector<T1>& v);
    
private:
    T* data;
    int size;
}; 

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

template <typename T>
Vector<T>::Vector(const Vector& other) : size(other.size) {
    data = new T[size];
    for (int i = 0;i < size; ++i) {
        data[i] = other.data[i];
    }
}

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

template<typename T>
T& Vector <T>::at(int e) {
    if(e >= size) {
        throw std::out_of_range("Index out of range");
    }
    return data[e];
}

template <typename T>
T& Vector<T>::operator[](int e) {
    if(e >= size) {
        throw out_of_range("Index out of range");
    }
    return data[e];
}

template <typename T1>
void output(const Vector<T1>& v) {
    for (int i = 0;i < v.size;++i) {
        cout << v.data[i] << ",";
    }
    cout << "\b \b" <<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 * 0.7;

    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<iomanip>
#include<fstream>

using namespace std;

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

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