实验2 数组、指针与C++标准库
1. 本次实验，目标是在实践中学习C++标准库中string, vector, array以及迭代器相关的基础用法。
task5.cpp:
1 #include<iostream> 2 #include <vector> 3 #include"Info.hpp" 4 using namespace std; 5 const int capacity = 50; 6 int main() 7 { 8 vector<Info>audience_info_list; 9 cout << "录入信息:" << endl; 10 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; 11 string name, contact, city; 12 int num = 0, n; 13 int count = 0; 14 while (cin >> name) 15 { 16 if (name != "ok") 17 { 18 cin >> contact >> city >> n; 19 if (capacity - num - n < 0) 20 { 21 cout << "对不起，只剩" << capacity - num << "个位置。" << endl; 22 cout << "1.输入u，更新(update)预定信息。" << endl; 23 cout << "2.输入q,退出预定。" << endl; 24 cout << "你的选择："; 25 string choice; 26 cin >> choice; 27 if (choice == "u") 28 { 29 cout << "请更新(update)预定信息" << endl; 30 continue; 31 } 32 else if (choice == "q") 33 { 34 cout << endl; 35 break; 36 } 37 } 38 else 39 { 40 num += n; 41 count++; 42 audience_info_list.push_back(Info(name, contact, city, n)); 43 } 44 } 45 else 46 break; 47 } 48 49 cout << "截至目前，一共有" << num << "位听众预定参加。预定听众信息如下：" << endl; 50 for (auto const& i : audience_info_list) 51 i.print(); 52 return 0; 53 }
Info.hpp
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 class Info 5 { 6 public: 7 Info(string nickname, string contact, string city, int n1) :m_nickname(nickname), m_contact(contact), m_city(city), n(n1) {}; 8 void print() const; 9 private: 10 string m_nickname, m_contact, m_city; 11 int n; 12 }; 13 void Info::print()const 14 { 15 cout << "称呼： " << m_nickname << endl; 16 cout << "联系方式： " << m_contact << endl; 17 cout << "所在城市： " << m_city << endl; 18 cout << "预定人数： " << n << endl; 19 }
更改数据后得两次运行结果：
task6.cpp:
1 #include "textcoder.hpp" 2 #include <iostream> 3 #include <string> 4 5 int main() 6 { 7 using namespace std; 8 9 string text, encoded_text, decoded_text; 10 11 cout << "输入英文文本: "; 12 while (getline(cin, text)) 13 { 14 encoded_text = TextCoder(text).encoder(); // 这里使用的是临时无名对象 15 cout << "加密后英文文本:\t" << encoded_text << endl; 16 17 decoded_text = TextCoder(encoded_text).decoder(); // 这里使用的是临时无名对象 18 cout << "解密后英文文本:\t" << decoded_text << endl; 19 cout << "\n输入英文文本: "; 20 } 21 }
TextCoder.hpp:
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 class TextCoder 5 { 6 public: 7 TextCoder(string text); 8 string encoder(); 9 string decoder(); 10 private: 11 string text; 12 }; 13 TextCoder::TextCoder(string text0) :text(text0) {} 14 string TextCoder::encoder() 15 { 16 for (int i = 0; i < text.length(); i++) 17 { 18 if (text[i] >= 'A' && text[i] <= 'U' || text[i] >= 'a' && text[i] <= 'u') 19 text[i] += 5; 20 else if (text[i] >= 'V' && text[i] <= 'Z' || text[i] >= 'v' && text[i] <= 'z') 21 text[i] -= ('V' - 'A'); 22 } 23 return text; 24 } 25 string TextCoder::decoder() 26 { 27 for (int i = 0; i < text.length(); i++) 28 { 29 if (text[i] >= 'F' && text[i] <= 'Z' || text[i] >= 'f' && text[i] <= 'z') 30 text[i] -= 5; 31 else if (text[i] >= 'A' && text[i] <= 'E' || text[i] >= 'a' && text[i] <= 'e') 32 text[i] += ('V' - 'A'); 33 } 34 return text; 35 }
更改数据后的测试结果：
