实验三

 ## 实验五

### info.hpp

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

class Info{
public:
    Info(string name,string cont,string city,int n){
        this->nickname = name;
        this->contact = cont;
        this->city = city;
        this->n = n;
        size += n;
    }
public:
    string nickname;
    string contact;
    string city;
    int n;
    static int size;  //当前容量
};
int Info::size = 0;

### task5.cpp

#include "info.hpp"
#include <vector>
#include <algorithm>

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

void show_info(){
    cout << "截止目前，一共有" << Info::size << "位听众预定参加。预定信息如下：" << endl;
    for(vector<Info>::iterator it = audience_info_list.begin(); it!=audience_info_list.end(); it++) {
        cout << "昵称：       "   << it->nickname << endl;
        cout << "联系方式：     " << it->contact << endl;
        cout << "所在城市：     " << it->city << endl;
        cout << "预定人数：     " << it->n << endl;
    }
    cout << endl;
    puts("");
}

void add_info(string nickname,string contact,string city,int n){
    if(n+Info::size <=capacity){
        Info inf(nickname, contact, city, n);
        audience_info_list.push_back(inf);
        cout << "恭喜您！预约成功~~" << endl;
        return;
    }else {
        char c;
        cout << "人数剩余不足~~还剩 " << capacity - Info::size << " 人" << endl;
        cout << "1.输入u更新预定人数:" << endl;
        cout << "2.输入q退出预定:" << endl;
        cout << "你的选择：" << endl;
        cin >>c;
        if(c=='q'){
            show_info();
            return;
        }
        else if(c=='u')   
            {
                cout << "更新人数：" << endl;
                cin >> n;
                if(n+Info::size <=capacity){
                    cout << " 更新成功" << endl;
                    Info inf(nickname, contact, city, n);
                    audience_info_list.push_back(inf);
                    return;
                }
                else{
                    cout << "错误指令！！" << endl;
                    return;
                }
            }
    }
}


int main(){
    cout << "录入信息：" << endl << endl;
    cout << "输入1录入信息 输入2显示当前录入人数：" << endl;
    int op;
    while(cin >> op){
        if(op==1){
            string nickname;
            string contact;
            string city;
            int n;
            cout << "昵称   " << "联系方式（邮箱/手机号）  " << "所在城市   " << "预定参加人数   " << endl;
            cin >> nickname >> contact >> city >> n;
            add_info(nickname, contact, city, n);
        }else if (op == 2) {
            show_info();
        }else {
            cout << "错误指令！" << endl;
            break;
        }
    }
    return 0;
}

 

 

 

## task 6

### textcoder.hpp

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

class TextCoder{
public:
    TextCoder(string text) : text(text) {}
    string get_ciphertext(){
        encoder();
        return text;
    }
    string get_deciphertext(){
        decoder();
        return text;
    }
private:
    //  2022, oop and c plus plus
    void encoder(){
        for (int i = 0; i <text.length(); i++){
            if(text[i] >='a' && text[i] <='u')  text[i]+=5;
            else if(text[i] >='v' && text[i] <='z')  text[i]-=21;
            else if(text[i] >='A' && text[i] <='U')  text[i]+=5;
            else if(text[i] >='V' && text[i] <='Z')  text[i] -=21;
            else
                ;
        }   
    }
    void decoder() {
        for (int i = 0; i <text.length(); i++){
            if(text[i] >='f' && text[i] <='z')  text[i]-=5;
            else if(text[i] >='a' && text[i] <='e')  text[i]+=21;
            else if(text[i] >='F' && text[i] <='Z')  text[i]-=5;
            else if(text[i] >='V' && text[i] <='Z')  text[i] +=21;
            else
                ;
        }
    }
private:
    string text;
};

### cpp

#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(); 
}