实验4

#include<iostream>
#include<string>

using std::string;

class TextCoder {
    private:
        string text;
        void encoder();
        void decoder();
    public:
        TextCoder(string &str);
        TextCoder(const TextCoder &t);
        string get_ciphertext();
        string get_deciphertext();
};
TextCoder::TextCoder(string &str)
    : text{str} {
}
TextCoder::TextCoder(const TextCoder &t)
    : text{t.text} {
}
void TextCoder::encoder() {
    for (auto &i : text) {
        if (i >= 'a' && i <= 'z')
            i = 'a' + ((i - 'a') + 7) % 26;
        else if (i >= 'A' && i <= 'Z')
            i = 'A' + ((i - 'A') + 7) % 26;
    }
}
void TextCoder::decoder() {
    for (auto &i : text) {
        if (i >= 'a' && i <= 'z')
            i = 'a' + ((i - 'a') + 26 - 7) % 26;
        else if (i >= 'A' && i <= 'Z')
            i = 'A' + ((i - 'A') + 26 - 7) % 26;
    }

}
string TextCoder::get_ciphertext() {
    encoder();
    return text;
}
string TextCoder::get_deciphertext() {
    decoder();
    return text;
}

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

void test() {
    using namespace std;

    string text, encoded_text, decoded_text;

    cout << "输入英文文本: ";
    while (getline(cin, text)) {
        encoded_text = TextCoder(text).get_ciphertext();  // 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).get_deciphertext(); // 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: ";
    }
}

int main() {
    test();
}

#include<iostream>

using std::string;

class Info {
    private:
        string nickname;
        string contact;
        string city;
        int n;
    public:
        Info(string&,string&,string&,int&);
        void print();
};
Info::Info(string &nickname,string &contact,string &city,int &n) {
    this->nickname = nickname;
    this->contact = contact;
    this->city = city;
    this->n = n;
}
void Info::print() {
    std::cout<<"昵称：\t\t"<<nickname<<std::endl;
    std::cout<<"联系方式：\t"<<contact<<std::endl;
    std::cout<<"所在城市：\t"<<city<<std::endl;
    std::cout<<"预定人数：\t"<<n<<std::endl;
}

#include <iostream>
#include <string>
#include <vector>
#include"Info.hpp"
using namespace std;

int main() {
    const int capacity = 100;
    vector<Info> audience_info_list;
    vector<Info> &v = audience_info_list;
    int sum = 0;

    cout << "录入信息：\n\n";
    cout << "昵称\t\t";
    cout << "联系方式(邮箱/手机号)\t\t";
    cout << "所在城市\t";
    cout << "预定人数" << endl;
    string nickname, contact, city;
    int n;
    while (cin >> nickname >> contact >> city >> n) {
        if (sum + n <= capacity) {
            Info a(nickname, contact, city, n);
            v.push_back(a);
            sum += n;
        }
        else {
            cout << "对不起，只剩" << capacity - sum << "个位置。\n";
            cout << "1.输入u，更新(updata)预定信息" << endl;
            cout << "2.输入q，退出预定" << endl;
            cout << "你的选择：";

            char c;
            cin >> c;
            if (c == 'q') break;
            else if (c == 'u') continue;
            else break;
        }
        if (sum == capacity) break;
    }
    cout << endl;

    cout << "截至目前，一共有" << sum << "位听众预定参加。";
    if (sum != 0) {
        cout << "预定听众信息如下：" << endl;
        for (int i = 0; i < v.size(); i++) {
            v[i].print();
            cout << endl;
        }
    }
}