实验4 现代C++标准库与类模板

 1 #pragma once
 2 
 3 #include <iostream>
 4 #include <string>
 5 
 6 using namespace std;
 7 
 8 class TextCoder {
 9     private:
10         string text;
11     private:
12         void encoder();
13         void decoder();
14     public:
15         string get_ciphertext();
16         string get_deciphertext();
17         TextCoder(string &s);
18 };
19 
20 void TextCoder::encoder() {
21     for (auto &i : text){
22         if (i >= 'a' && i <= 'z')
23             i = 'a' + ((i - 'a') + 7) % 26;
24         else if (i >= 'A' && i <= 'Z')
25             i = 'A' + ((i - 'A') + 7) % 26;
26     }
27 }
28 
29 void TextCoder::decoder() {
30     for (auto &i : text){
31         if (i >= 'a' && i <= 'z')
32             i = 'a' + ((i - 'a') + 26 - 7) % 26;
33         else if (i >= 'A' && i <= 'Z')
34             i = 'A' + ((i - 'A') + 26 - 7) % 26;
35     }
36 }
37 
38 string TextCoder::get_ciphertext() {
39     encoder();
40     return text;
41 }
42 
43 string TextCoder::get_deciphertext() {
44     decoder();
45     return text;
46 }
47 
48 TextCoder::TextCoder(string &s): text{s} {
49 }

 1 #include "textcoder.hpp"
 2 #include <iostream>
 3 #include <string>
 4 
 5 void test() {
 6     using namespace std;
 7 
 8     string text, encoded_text, decoded_text;
 9 
10     cout << "输入英文文本: ";
11     while (getline(cin, text)) {
12         encoded_text = TextCoder(text).get_ciphertext();  // 这里使用的是临时无名对象
13         cout << "加密后英文文本:\t" << encoded_text << endl;
14 
15         decoded_text = TextCoder(encoded_text).get_deciphertext(); // 这里使用的是临时无名对象
16         cout << "解密后英文文本:\t" << decoded_text << endl;
17         cout << "\n输入英文文本: ";
18     }
19 }
20 
21 int main() {  
22     test(); 
23 }

 1 #pragma once
 2 
 3 #include <iostream>
 4 #include <string>
 5 
 6 using namespace std;
 7 
 8 class Info {
 9     private:
10         string nickname;
11         string contact;
12         string city;
13         int n;
14     public:
15         Info(const string& nickname, const string& contact, const string& city, const int& n);
16         void print() const;
17 };
18 
19 Info::Info(const string& nickname, const string& contact, const string& city, const int& n): nickname{nickname}, contact{contact}, city{city}, n{n} {    
20 }
21 
22 void Info::print() const {
23     cout << "昵称：\t\t" << nickname << endl;
24     cout << "联系方式：\t" << contact << endl;
25     cout << "所在城市：\t" << city << endl;
26     cout << "预定人数：\t" << n << endl;
27 }

 1 #include <iostream>
 2 #include <string>
 3 #include <vector>
 4 #include "info.hpp"
 5 
 6 using namespace std;
 7 
 8 int main() {
 9     const int capacity = 100;
10     
11     int reserved = 0;
12     string nickname, contact, city;
13     int n;
14     
15     vector<Info> audience_info_list;
16     vector<Info> &v = audience_info_list;
17     
18     cout << "录入信息：\n";
19     cout << "昵称\t\t";
20     cout << "联系方式(邮箱/手机号)\t\t";
21     cout << "所在城市\t";
22     cout << "预定人数" << endl;
23     
24     while(cin >> nickname >> contact >> city >> n)
25     {
26         if(reserved + n <= capacity)
27         {
28             Info in(nickname, contact, city, n);
29             v.push_back(in);
30             reserved += n;
31         }
32         else
33         {
34             cout << "对不起,只剩" << capacity - reserved << "个位置.\n";
35             cout << "1.输入u，更新(updata)预定信息" << endl;
36             cout << "2.输入q，退出预定" << endl;
37             cout << "你的选择：";
38             
39             char c;
40             cin >> c;
41             if(c == 'q') break;
42             else if(c == 'u') continue;
43             else break; 
44         }
45         if (reserved == capacity) break;
46     }
47     cout << endl;
48     
49     cout << "截至目前,一共有" << reserved << "位听众预定参加.";
50     if(reserved != 0)
51     {
52         cout << "预定听众信息如下：" << endl;
53         for (auto i = 0; i < v.size(); i++)
54         {
55             v[i].print();
56             cout << endl;
57         }
58     }
59 }