第三次实验

#include<iostream>
#include<vector>
#include<string>
#include"5.1.h"
using namespace std;

int main()
{

cout<<"录入信息:"<<endl;
cout<<" 昵称"<<"     "<<"联系方式（邮箱\手机号）"<<"     "<<"所在城市"<<"     "<<"预定参加人数" <<endl; 
    int i=0,n0=0,sum=0;
    const int capacity=100;//最多的听众人数
    vector <Info> audience_info_list;
    string s1,s2,s3,s4;
while(Info::num<=capacity&&cin>>s1){
cin>>s1;cin>>s2;cin>>s3;cin>>n0;
Info f1(s1,s2,s3,n0);
audience_info_list.push_back(f1);
Info::num=Info::num+n0;

if(Info::num>capacity)
{sum=capacity-(Info::num-n0);
    cout<<"对不起，只剩"<<sum<<"个位置"<<endl;
    cout<<"1.输入u，更新预定信息"<<endl;
     cout<<"2.输入q，退出预定"<<endl;
     char s;
     cout<<"您的选择：";
     cin>>s;
     if(s=='q')
     {
     Info::num=Info::num-n0;
     break;
    }
     else if (s=='u')    
     {Info::num=Info::num-n0;
    continue;

}
     
     else
     cout<<"输入错误，请重新输入"<<endl; }
     
}
cout<<"截至目前，一共有"<<Info::num<<"位听众预定参加，他们的信息如下"<<endl;
for(i=0;i<audience_info_list.size();i++)
audience_info_list[i].print(); 
}

#include<iostream>
using namespace std;
class Info{
    public:
        Info()=default;
    Info(string name0,string email0,string city0,int n0):nickname(name0),contact(email0),city(city0),n(n0){    }
    void print(){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;
    cout<<endl;}    
    static int num;
    private:
        string nickname,contact,city;
int n;
};
 int Info:: num =0;

#include<iostream>
#include<string>
using namespace std;
class TextCoder{
    
    public:
        TextCoder(string text1):text(text1){}
        string get_ciphertext(){excoder();return text;}
        string get_deciphertext(){decoder();return text;}
    private:
        void excoder(){
            int j=0;
            for(int i=0;i<text.length();++i){
    if(((text.at(j)>='a')&&(text.at(j)<='u'))||((text.at(j)>='A')&&(text.at(j)<='U')))
    text.at(j)=text.at(j)+5;
    else if(text.at(j)>'z'||text.at(j)<'A'||((text.at(j)>'Z')&&(text.at(j)<'a')))
;
else text.at(j)=text.at(j)-21;
j++;
}
}
        void decoder(){
            int j=0;
        for(int i=0;i<text.length();++i)
        {
                
if(((text.at(j)>='f')&&(text.at(j)<='z'))||((text.at(j)>='F')&&(text.at(j)<='Z')))
text.at(j)=text.at(j)-5;
else if(text.at(j)>'z'||text.at(j)<'A'||((text.at(j)>'Z')&&(text.at(j)<'a')))
;
else
    text.at(j)=text.at(j)+21;
j++;}
}
    private:
    string text;
};