实验二

task5:

　

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

using namespace std;

int main()
{
    int t = 0, i = 0;
    char choice;
    cout << "录入信息：" << "\n" <<"称呼/昵称，联系方式（邮箱/手机号），所在城市，预定参加人数" << endl; 
    string n_nickname, n_contact, n_city;
    int n; 
    const int capacity = 100;
    vector<info> audience_info_list;
    while(cin >> n_nickname){
        cin >> n_contact >> n_city >> n;
        if(t + n <=capacity){
            info amb(n_nickname, n_contact, n_city, n);
            audience_info_list.push_back(amb);
            t+=n;
            if(t == capacity)
                break;
        }
        else{
            cout << "对不起，只剩" << (capacity-t) << "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：" ;
            cin >> choice;
            if(choice == 'u')
                cout << "请重新输入: " ;
            else
                break;  
        }
}
    cout << "截至目前，一共有" << t  << "位听众预定参加，预定听众消息如下：" << endl;
    for(auto it = audience_info_list.begin(); it != audience_info_list.end(); ++it)
        it->print();    
            
    return 0;
}

#include<iostream>
#include<string>
using namespace std;
class info{
    public:
        info(string nickname, string contact, string city, int n):
            m_nickname(nickname), m_contact(contact), m_city(city), m_n(n){
            } 
        void print() const {
            cout << "称呼： " << m_nickname << endl;
            cout << "联系方式： " << m_contact << endl;
            cout << "所在城市： " << m_city << endl;
            cout << "预定人数： " << m_n << endl;
        } 
    private:
        string m_nickname;
        string m_contact;
        string m_city;
        int m_n;
};

task6:

　　

#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: ";
    }
}

#include<iostream>
#include<string>

using namespace std;

class TextCoder{
    public:
        TextCoder(string text):m_text(text){}
        string encoder(){
            for(int i = 0; i < m_text.size() ; i++){
            if((m_text[i] >= 'a' && m_text[i] <= 'u')||(m_text[i] >= 'A' && m_text[i] <= 'U') ) 
                m_text[i] += 5;
            else if( (m_text[i] > 'u' && m_text[i] <= 'z') || (m_text[i] > 'U' && m_text[i] <='Z') )
                m_text[i] -= 21; 
            }
            return m_text;
        }
        string decoder(){
            for(int i = 0; i < m_text.size(); i++){
                if((m_text[i] >= 'f' && m_text[i] <= 'z') || (m_text[i] >= 'F' && m_text[i] <= 'Z'))
                    m_text[i] -= 5;
                else if((m_text[i] >= 'a' && m_text[i] < 'f') || (m_text[i] >= 'A' && m_text[i] < 'F'))
                    m_text[i] += 21;
            }
            return m_text;
        }
        ~TextCoder()=default;
    private:
        string m_text;
};

五、实验总结

　　1.isalpha()函数，判断是否是字母，是返回非0值，不是返回0；

　　2.对一个对象赋值，可以重新创建一个对象，给其赋值以后再将其拷贝给我们需要的对象。