实验二：数组、指针与C++标准库

实验任务5

Info.cpp文件源码：

#include <iostream>
#include <string>
#include <vector>
using namespace std;

class Info {
public:
	Info(string NICKNAME, string CONTACT, string CITY, int N) : nickname(NICKNAME), contact(CONTACT), city(CITY), n(N) {}
	~Info() = default;
	void print()
	{
		cout << "称呼：\t\t" << nickname << endl;
		cout << "联系方式：\t" << contact << endl;
		cout << "所在城市：\t" << city << endl;
		cout << "预定人数：\t" << n << endl;
	}
private:
	string nickname;
	string contact;
	string city;
	int n;
};

　　task5.cpp源码：

#include <iostream>
#include <string>
#include <vector>
#include "Info.cpp"
using namespace std;

const int capacity = 100;

int main() {
	vector<Info>audience_info_list;
	string NICKNAME, CONTACT, CITY;
	int N, i = 0, sum = 0;
	cout << "录入信息：\n\n";
	cout << "称呼/昵称，联系方式（邮箱/手机号），所在城市，预定参加人数；\n";
	while (cin >> NICKNAME)
	{
		cin >> CONTACT;
		cin >> CITY;
		cin >> N;
		if (sum + N > capacity)
		{
			char flag;
			cout << "对不起，只剩下" << (capacity - sum) << "个位置。\n";
			cout << "1、输入u，更新(update)预定信息\n" << "2、输入q，退出预定\n" << "你的选择：\t";
			cin >> flag;
			if (flag == 'q') break;
			if (flag == 'u')
			{
				cout << "重新输入预定信息：\n";
				continue;
			}
		}
		sum += N;
		Info temp(NICKNAME, CONTACT, CITY, N);
		audience_info_list.push_back(temp);
		i++;
	}
	cout << "截至目前，一共有" << sum << "位听众预约参加。预定听众信息如下：\n";
	for (int j = 0; j < i; j++)
	{
		audience_info_list[j].print();
	}
}

　　编译演示：

 

 实验任务6

TextCoder.hpp文件源码：

#include <iostream>
#include <string>
using namespace std;

class TextCoder
{
public:
	TextCoder(string temp) : text(temp) {}
	~TextCoder() = default;
	string encoder()
	{
		for (int i = 0; i < text.size(); i++)
		{
			if (text[i] <= 'u' && text[i] >= 'a')
			{
				text[i] += 5;
				continue;
			}
			if (text[i] <= 'z' && text[i] >= 'v')
			{
				text[i] = 'a' + (4 + static_cast<int>(text[i] - 'z'));
				continue;
			}
			if (text[i] <= 'U' && text[i] >= 'A')
			{
				text[i] += 5;
				continue;
			}
			if (text[i] <= 'Z' && text[i] >= 'V')
			{
				text[i] = 'A' + (4 + static_cast<int>(text[i] - 'Z'));
				continue;
			}
		}
		return text;
	}
	string decoder()
	{
		for (int i = 0; i < text.size(); i++)
		{
			if (text[i] <= 'z' && text[i] >= 'f')
			{
				text[i] -= 5;
				continue;
			}
			if (text[i] <= 'e' && text[i] >= 'a')
			{
				text[i] = 'z' - (4 - static_cast<int>(text[i] - 'a'));
				continue;
			}
			if (text[i] <= 'Z' && text[i] >= 'F')
			{
				text[i] -= 5;
				continue;
			}
			if (text[i] <= 'E' && text[i] >= 'A')
			{
				text[i] = 'Z' - (4 - static_cast<int>(text[i] - 'A'));
				continue;
			}
		}
		return text;
	}
private:
	string text;
};

　　task6.cpp源码：

#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: ";
	}
}

　　编译演示：

 

 实验总结：1、vector类的使用，不能越界；2、在赋值前，不要对vector类的对象使用下标；