实验3 数组、指针与现代C++标准库

#pragma once
#include<iostream>
#include<string>
#include<iomanip>

using namespace std;

class Info {
public:
	string nickname, contact, city;
	int n;

	Info(string ni, string co, string ci, int x) {
		nickname = ni;
		contact = co;
		city = ci;
		n = x;
	}

	void print() {
		cout << left << setw(10) << "昵称:" << nickname<<endl;
		cout << left << setw(10) << "联系方式:" <<contact << endl;
		cout << left << setw(10) << "所在城市:" << city << endl;
		cout << left << setw(10) << "预定人数:" << n << endl;
		cout << endl;
	}

};

　　

#include"Info.h"
#include<iostream>
#include<vector>
#include<limits>
#include<string> 
#include<algorithm>

using namespace std;

int main() {
	cout << "录入信息：" << endl;
	cout << left << setw(10) << "昵称" 
		<< setw(20) << "联系方式（邮箱、手机号）" 
		<< setw(10) << "所在城市" 
		<< setw(10) << "预定参加人数" << endl;
	
	const int capacity = 100;
	int n = 0, s = 0, m = 0, i = 0;
	string ju;
	string name, contact, city;

	vector<Info>audience_info_list;
	while (cin>>name)
	{
		cin >> contact >> city;
		cin >> n;

		s += n;
		m++;
		if (s > capacity)
		{
			cout << "对不起，只剩" << (capacity - s + n) << "个位置" << endl
				<< "1.输入u，更新（update）预定信息" << endl
				<< "2.输入q，退出预定" << endl
				<< "你的选择：";
			cin >> ju;
			if (ju == "u")
			{
				s -= n;
				m -= 1;
				continue;
			}
			if (ju == "q")
			{
				s -= n;
				m -= 1;
				break;
			}
		}
		Info a{ name,contact,city,n };
		audience_info_list.push_back(a);
		
	}

	cout << "截至目前，一共有" << s << "位听众预定参加。预定听众信息如下：" << endl;
	for (i=0;i < m;i++)
	{
		audience_info_list[i].print();
	}

}

　

6.

#pragma once
#include<iostream>
#include<string>

using namespace std;

class TextCoder
{
private:
	string text;
	void encoder()
	{
		for (auto& st : text)
		{
			if (st >= 'a' && st <= 'u')
				st += 5;
			else if (st >= 'A' && st <= 'U')
				st += 5;
			else if (st >= 'v' && st <= 'z')
				st = st - 26+ 5;
			else if (st >= 'V' && st <= 'Z')
				st = st - 26+ 5;
		}
	}
	void decoder() 
	{
		for (auto& st : text)
		{
			if (st >= 'f' && st <= 'z')
				st -= 5;
			else if (st >= 'F' && st <= 'Z')
				st -= 5;
			else if (st >= 'a' && st <= 'e')
				st = st + 26 - 5;
			else if (st >= 'A' && st <= 'E')
				st = st +26 - 5;
		}
	}

public:
	TextCoder(string t)
	{
		text = t;
	}
	TextCoder(TextCoder& obj);
	string get_ciphertext()
	{
		encoder();
		return text;
	}
	string get_deciphertext()
	{
		decoder();
		return text;
	}
};

　　

#include "TextCoder.h"
#include <iostream>
#include <string>
void test() {
	using namespace std;
	string text, encoded_text, decoded_text;
	cout << "输入英文文本: ";
	while (getline(cin, text)) {
		encoded_text = TextCoder(text).get_ciphertext(); 
			cout << "加密后英文文本:\t" << encoded_text << endl;
			decoded_text = TextCoder(encoded_text).get_deciphertext(); 
			cout << "解密后英文文本:\t" << decoded_text << endl;
		cout << "\n输入英文文本: ";
	}
} int main() {
	test();
}