实验四 现代c++ 标准库与类的模板

#include <iostream>
#include <string>
#pragma once 
using namespace std;

class TextCoder {
private:
    string text;

    void encoder();

    void decoder();

public:
    TextCoder(const string &Text);

    string get_ciphertext();

    string get_deciphertext();
};

TextCoder::TextCoder(const string &Text) : text{Text} {}

void TextCoder::encoder() {
    for (char &ch : text) {
        if (isalpha(ch))//判断是否是字符 
         {
            char base = islower(ch) ? 'a' : 'A';
            ch = (ch - base + 7) % 26 + base;
        }
    }
}

void TextCoder::decoder() {
        for (char &ch : text) {
            if (isalpha(ch)) {
                char base = isupper(ch)?'A':'a';
                ch = (ch - base + 26 - 7) % 26 + base;
            }
        }
    }

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>
#include <vector>
#include <string>

using namespace std;

class Info {
private:
    string nickname;
    string contact;
    string city;
    int n;

public:
    Info(const string &nickname, const string &contact, const string &city, int n)
        : nickname(nickname), contact(contact), city(city), n(n) {} 

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

    }
};

int main() {
    const int limitsum = 100;//const常量安全性  
    vector<Info> audience_info_list;

    cout << "录入信息：" << endl << endl;
    cout << "昵称         联系方式(邮箱/手机号)      所在城市    预约参加人数" << endl;

    int totalNumber = 0; 

    while (1) {
        string nickname, contact, city;
        int n;
        if (!(cin >> nickname >> contact >> city >> n)) 
        {
            break; //ctrl+z退出循环 
        }

        if (n <= 0) {
            cout << "预定参加人数必须大于0，请重新输入。\n";
            continue;
        }

        if (n > limitsum) {
            char choice;
            cout << "对不起，只剩" << limitsum - totalNumber << "个名额。" << 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：";
            cin >> choice;
            cout<<endl; 

            if (choice == 'q') {
                break; 
            } else if (choice == 'u') {
                cout << "请重新输入信息:\n";
                continue;
            }
        }

        totalNumber += n;
        audience_info_list.emplace_back(nickname, contact, city, n);
        //.emplace_back()从尾部直接构造对象，而不需要用push_back把一个个对象构造出来再插入，
        //避免拷贝更加高效 
    }

    cout << "截止目前，一共有" << totalNumber << "位预约人数预定参加。预定听众信息如下：" << endl;

    for (const auto &info : audience_info_list) {
        info.output();
    }
    //迭代器遍历输出 
}