实验三

task5:

//info.hpp

#include<iostream>
#include<string>
using namespace  std;
class info {
private:
    string nickname, contact, city;
    int n;
    static int a;
public:
    info(string ni, string co, string ci, int nn) :nickname(ni), contact(co), city(ci), n(nn) { a += n; }
    info() :nickname("n"), contact("co"), city("ci"), n(0) {}
    void print()const;
    static void printa();
    static int geta() { return a; }
};
int info::a = 0;
void info::print()const {
    cout << "昵称：     " << nickname << endl;
    cout << "联系方式： " << contact << endl;
    cout << "城市：     " << city << endl;
    cout << "预定人数：  " <<n<<endl << endl;
}
void info::printa() {
    cout << "截至目前，一共有" << a << "位听众预定参加。预定听众信息如下："<<endl;
}

//task5.cpp

#include<iostream>
#include<string>
#include<iomanip>
#include"info.hpp"
using namespace std;
const int capacity = 100;
int main() {
    string ni, co, ci, choose;
    int nn, f = 1, l = 0;
    info vector[capacity];
    cout << "录入信息：" << endl << endl;
    cout <<  "昵称\t\t"<< "联系方式（邮箱/手机号）\t\t" << "所在城市\t\t" << "预定参加人数\t\t" << endl;
    while (cin >> ni>>co>> ci>> nn) {
        if (info::geta()+nn> 100) { f = 0; break; }
        info i(ni, co, ci, nn);
        vector[l] = i;
        l++;
    }
    if (f == 0) {
        cout << "对不起，只剩" << capacity - info::geta() << "个位置。" << endl << "1.输入u，更新预定信息" << endl << "2.输入q，退出预定" << endl << "你的选择：";
        cin >> choose;
        cout << endl << endl;
    }
    info::printa();
    for (int j = 0; j < l; j++) {
        vector[j].print();
    }
}

运行结果：

task6:

//textcoder.hpp

#include<iostream>
#include<string>
using namespace std;
class TextCoder {
public:
    TextCoder(){}
    TextCoder(string t):text(t){}
    string get_ciphertext();
    string get_deciphertext();
private:
    string text;
    void encoder();//形参列表为空！
    void decoder();
};

void TextCoder::encoder() {
    for (int i = 0; i < text.length(); i++) {
        if (('a' <= text[i] && text[i] <= 'z') || ('A' <= text[i] && text[i] <= 'Z')) {
            if (('v' <= text[i] && text[i] <= 'z') || ('V' <= text[i] && text[i] <= 'Z')) { text[i] = text[i] - 21; }
            else { text[i] = text[i] + 5;}
        }
    }
    
}
string TextCoder::get_ciphertext() {
    
    encoder();
    return text;
}
string TextCoder::get_deciphertext() {
    
    decoder();
    return text;
}
void TextCoder::decoder() {
    for (int i = 0; i <text.length(); i++) {
        if (('a' <= text[i] && text[i] <= 'z') || ('A' <= text[i] && text[i] <= 'Z')) {
            if (('f' <= text[i] && text[i] <= 'z') || ('F' <= text[i] && text[i] <= 'Z')) { text[i] = text[i] - 5; }
            else { text[i] = text[i] + 21;}
        }    
    }
}

//task6.cpp

#include "textcoder.hpp"
#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(); // 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).get_deciphertext(); // 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: ";
    }
}
int main() {
    test();
}

运行结果：