实验任务5

Info.hpp

#include <iostream>
#include <string>

using namespace std;

class Info
{
    public:
        Info(string a, string b, string c, int d);
        void print() const;
    private:
        string nickname, contact, city;
        int n;
};

Info::Info(string a, string b, string c, int d) : nickname{a}, contact{b}, city{c}, n{d} {}

void Info::print() const
{
    cout << "称呼:         " << nickname << endl;
    cout << "联系方式:     " << contact << endl;
    cout << "所在城市:     " << city << endl;
    cout << "预定人数:     " << n << endl;
}

task5.cpp

#include "info.hpp"
#include <iostream>
#include <string>
#include <vector>

using namespace std;

const int capacity = 100;
vector<Info> audience_info_list;

int main()
{
    cout << "录入信息：" << endl;
    cout << endl;
    cout << "称呼/昵称，联系方式(邮箱/手机号)，所在城市，预定参加人数" << endl;

    int d, now = 0;
    string a, b, c;

    while(cin >> a >> b >> c >> d)
    {
        Info temp(a, b, c, d);
        if(now + d <= capacity)
        {
        	now += d;
        	audience_info_list.push_back(temp);
		}
        else
        {
            cout << "对不起，只剩" << capacity - now << "个位置." << endl;
            cout << "1. 输入u, 更新(update)预定信息" << endl;
            cout << "2. 输入q, 退出预定" << endl;
            cout << "你的选择：";

            char op;
            cin >> op;

            if(op == 'u')
              continue;
            else if(op == 'q')
              break;
        }
    }
    cout << "截至目前，一共有" << now << "位听众预定参加。预定听众信息如下：" << endl;
    for(auto const& obj : audience_info_list)
      obj.print();
    return 0;
}

运行结果

实验任务6

TextCoder.hpp

#include <string>

using namespace std;

class TextCoder
{
    public:
        TextCoder(string s) : text{s} {}
        string encoder();
        string decoder();
    private:
        string text;
};
string TextCoder::encoder()
{
    for(auto &ch : text)
    {
        if(ch >= 'a' && ch <= 'z')
        {
            ch += 5;
            if(ch > 'z')
              ch -= 'z' - 'a';
        }
        else if(ch >= 'A' && ch <= 'Z')
        {
            ch += 5;
            if(ch > 'Z')
              ch -= 'Z' - 'A';
        }
    }
    return text;
}
string TextCoder::decoder()
{
    for(auto &ch : text)
    {
        if(ch >= 'a' && ch <= 'z')
        {
            ch -= 5;
            if(ch < 'a')
              ch += 'z' - 'a';
        }
        else if(ch >= 'A' && ch <= 'Z')
        {
            ch -= 5;
            if(ch > 'Z')
              ch += 'Z' - 'A';
        }
    }
    return text;
}

task6.cpp

#include "textcoder.hpp"
#include <iostream>
#include <string>

int main()
{
    using namespace std;

    string text, encoded_text, decoded_text;

    cout << "输入英文文本: ";
    while (getline(cin, text))
    {
        encoded_text = TextCoder(text).encoder();  // 这里使用的是临时无名对象
        cout << "加密后英文文本:\t" << encoded_text << endl;

        decoded_text = TextCoder(encoded_text).decoder(); // 这里使用的是临时无名对象
        cout << "解密后英文文本:\t" << decoded_text << endl;
        cout << "\n输入英文文本: ";
    }
}

运行结果

实验总结

之前一直以为标准库里的vector、array、string、迭代器等十分难上手，没有接触，现在发现十分好用，配合auto变量能让代码变得简洁易懂，以后要经常使用。