实验三作业

实验五：
#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

class Info
{
private:
    string nickname;
    string contact;
    string city;
    int num;
public:
    static int all;

    Info(string s1 = "", string s2 = "", string s3 = "", int n = 0) :
        nickname(s1), contact(s2), city(s3), num(n) {
        all += n;
    }

 
    void print() const
    {
        
        cout << setw(16) << nickname << setw(16) << contact << setw(16) << city << setw(16) << num << endl;
    }

    void pop_back() { all -= num; }
};

int Info::all = 0;


#include "info.hpp"
#include <vector>

using namespace std;
const int capability = 100;

void input(string& nickname, string& contact, string& city, int& num)
{
    cout << "请输入姓名：";
    cin >> nickname;
    cout << "请输入联系方式：";
    cin >> contact;
    cout << "请输入城市：";
    cin >> city;
    cout << "请输入人数：";
    cin >> num;
}

int main()
{
    string nickname, contact, city;
    int num, flag = 1;
    vector<Info> reserve{ 0 };
    while (flag)
    {
        cout << "当前人数  : " << Info::all << endl;
        input(nickname, contact, city, num);
        Info temp(nickname, contact, city, num);
        reserve.push_back(temp);
        if (Info::all > capability)
        {
            reserve.pop_back();
            temp.pop_back();
            cout << "人数过多! 剩余容量为: " << capability - Info::all << endl;
            cout << "请输入1修改人数或者输入0退出程序:";
            cin >> flag;
        }
        else if (Info::all == capability)
        {
            flag = 0;
            cout << "停止录入!" << endl;
        }
        else
        {
            cout << "是否继续录入?请输入1继续,否则请输入0: ";
            cin >> flag;
        }
        cout << endl;
    }
    cout.setf(ios::left);
    cout << setw(16) << "nickname:" << setw(16) << "contact:" << setw(16) << "city: " << setw(16) << "num: " << endl;
    for (const auto& i : reserve)
        i.print();
    return 0;
}

实验六

#include <iostream>
#include <string>

using namespace std;

bool islower(char text)
{
if ('a' <= text && text <= 'z')
return true;
else
return false;
}

bool isupper(char text)
{
if ('A' <= text && text <= 'Z')
return true;
else
return false;
}

string encode(char text)
{
string s;
if (islower(text))
return s = text + 5 - (text + 4) / ('z') * 26;
else if (isupper(text))
return s = text + 5 - (text + 4) / ('Z') * 26;
else
return s = text;
}

string decode(char text)
{
string s;
if (islower(text))
return s = text - 5 + ('a') / (text - 4) * 26;
else if (isupper(text))
return s = text - 5 + ('A') / (text - 4) * 26;
else
return s = text;
}

class TextCoder
{
private:
string text;

string encoder()
{

for (int i = 0; text[i]; ++i)
text.replace(i, 1, encode(text[i]));
return text;
}

string decoder()
{

for (int i = 0; text[i]; ++i)
text.replace(i, 1, decode(text[i]));
return text;
}
public:
TextCoder(string code) : text(code) {}
string get_ciphertext()
{
return encoder();
}
string get_deciphertext()
{
return decoder();
}
};