1 #include<iostream> 
 2 #include<string>
 3 #include<iomanip>
 4 #include<vector>
 5 using namespace std;
 6 class info{
 7 public:
 8     info(string nickname0,string contact0,string city0,int n0);
 9     void print();
10 private:
11     string nickname;
12     string contact;
13     string city;
14     int n;
15 };
16 info::info(string nickname0,string contact0,string city0,int n0):nickname(nickname0),contact(contact0),city(city0),n(n0){};
17 void info::print(){
18     cout<<setw(15)<<left<<"称呼:"<< nickname <<endl;
19     cout<<setw(15)<<left<<"联系方式:"<< contact <<endl;
20     cout<<setw(15)<<left<<"所在城市:"<< city <<endl;
21     cout<<setw(15)<<left<<"预订人数:"<< n <<endl;
22 }
23 
24 int main(){
25     char a;
26     vector<info>audience_info_list;
27     const int capacity = 100;
28     string nickname,contact,city;
29     int n;
30     int sum = 0;
31     cout<<"录入信息："<<endl;
32     cout<<endl;
33     cout<<"称呼/昵称，联系方式（邮箱/手机号），所在城市，预定参加人数"<<endl;
34     while(cin>>nickname>>contact>>city>>n){
35         sum+=n;
36         if(capacity>=sum){
37             info massage(nickname,contact,city,n);
38             audience_info_list.push_back(massage) ;
39             
40         }
41         else{
42             int b;
43             b=sum-capacity;
44             cout<<"对不起，只剩"<< n-b <<"个位置"<<endl;
45             cout<<"1.输入u，更新(update)预订信息"<<endl;
46             cout<<"2.输入q，退出；预定"<<endl;
47             cout<<"你的选择是：" ; 
48             cin>>a;
49             if(a=='q'){
50                 break;
51             } 
52             else if(a=='u'){
53                 continue;
54             }
55             cout<<endl;
56         }
57     } 
58     cout<<endl;
59     cout<<"截至目前，一共有"<<sum-n<<"位听众预定参加。预定听众信息如下："<<endl;
60     cout<<endl;
61     for(auto it = audience_info_list.begin();it!=audience_info_list.end();it++){
62         it->print();
63     } 
64 }
 1 #include<iostream>
 2 #include<string>
 3 using namespace std;
 4 class TextCoder
 5 {
 6 public:
 7     TextCoder(string temp):text(temp){}
 8     ~TextCoder()=default;\
 9     string encoder()
10     {
11         for(int i=0;i<text.size();i++)
12         {
13             if(text[i]<='u'&&text[i]>='a')
14             {
15                 text[i]+=5;
16                 continue;
17             }
18             if(text[i]<='z'&&text[i]>='v')
19             {
20                 text[i]='a'+(static_cast<int>(text[i]-'z')+4);
21                 continue;
22             }
23             if(text[i]<='U'&&text[i]>='A')
24             {
25             text[i]+=5;
26             continue;
27             }
28             if(text[i]<='Z'&&text[i]>='V')
29             {
30                 text[i]='A'+(static_cast<int>(text[i]-'Z'+4));
31                 continue;
32             }
33         }
34         return text;
35     }
36     string decoder()
37     {
38         for(int i=0;i<=text.size();i++)
39         {
40             if(text[i]<='z'&&text[i]>='f')
41             {
42                 text[i]-=5;
43                 continue;
44              } 
45              if(text[i]<='e'&&text[i]>='a')
46              {
47                  text[i]='z'-(4-static_cast<int>(text[i]-'a'));
48                  continue;
49              }
50              if(text[i]<='Z'&&text[i]>='F')
51              {
52                  text[i]-=5;
53                  continue;
54              }
55              if(text[i]<='E'&&text[i]>='A')
56              {
57                  text[i]='Z'-(4-static_cast<int>(text[i]-'A'));
58                  continue;
59              }
60         }
61         return text;
62     }
63 private:
64     string text;
65 };
66 
67 
68 
69 
70 int main()
71 {
72     using namespace std;
73     string text,encoded_text,decoded_text;
74     cout<<"输入英文文本：";
75     while(getline(cin,text)) 
76     {
77         encoded_text=TextCoder(text).encoder();
78         cout<<"加密后英文文本：\t"<<encoded_text<<endl;
79         decoded_text=TextCoder(text).decoder();
80         cout<<"解密后的英文文本：\t"<<decoded_text<<endl;
81         cout<<"输入英文文本："; 
82     }
83 }