//请看功能介绍,附:C++98 CALC V2.1可以更改屏幕颜色 
#include<windows.h>
#include<iostream>
#include<unistd.h>
#include<iomanip>
#include<cmath>
#include<ctime>
using namespace std;
void time() {
    time_t now = time(0);
    tm *localTime = localtime(&now);
    cout << "·当前时间: ";
    cout << (localTime->tm_year + 1900) << "-"
         << (localTime->tm_mon + 1) << "-"
         << localTime->tm_mday << " "
         << localTime->tm_hour << ":"
         << localTime->tm_min << ":"
         << localTime->tm_sec << endl;
    cout << endl;
}
long double jia(long double a,long double b) {
    cout << "输入第一个加数" << endl;
    cin >> a;
    cout << "输入第二个加数" << endl;
    cin >> b;
    cout << fixed << a + b << endl << endl;
    time();
}
long double jian(long double a,long double b) {
    cout << "输入被减数" << endl;
    cin >> a;
    cout << "输入减数(比被减数小)" << endl;
    cin >> b;
    cout << fixed << a - b << endl;
    time();
}
long double cheng(long double a,long double b) {
    cout << "输入第一个乘数" << endl;
    cin >> a;
    cout << "输入第二个乘数" << endl;
    cin >> b;
    cout << fixed << a * b << endl;
    time();
}
int chu(int a,int b) {
    cout << "输入被除数" << endl;
    cin >> a;
    cout << "输入除数(比除数小,不得为0)" << endl;
    cin >> b;
    if (a % b != 0) cout << a / b << "······" << a % b << endl;
    else cout << cout << a / b << endl;
    time();
}
int chf(int a,int b) {
    cout << "[x]的[y]次方?(按顺序输入x与y)" << endl;
    cin >> a >> b;
    cout << pow(a,b) << endl;
    time();
}
int main() {
    int s;
    mainc:
    cout << "   CCCCCCCCCCC                             999999999        888888888" << endl;
    cout << " CCCCCCCCCCCCC BL_TURTLE's CansLC         99999999999      88888888888" << endl;
    cout << "CCCC                                     9999     9999    888       888" << endl;
    cout << "CCC                +++         +++       999       999    888       888" << endl;
    cout << "CCC                +++         +++       9999     9999    888       888" << endl;
    cout << "CCC            +++++++++++ +++++++++++    99999999999      88888888888" << endl;
    cout << "CCC            +++++++++++ +++++++++++     999999999       88888888888" << endl;
    cout << "CCC                +++         +++              999       888       888" << endl;
    cout << "CCC                +++         +++             999        888       888" << endl;
    cout << "CCCC                                          999         888       888" << endl;
    cout << " CCCCCCCCCCCCC C++98 CALC V2.1               999           88888888888" << endl;
    cout << "   CCCCCCCCCCC                              999             888888888" << endl;
    cout << "------------------------------------------------------------------------" << endl;
    cout << "欢迎使用 C++98 计算器!" << endl << endl;
//    cout << "版本: Calc V2.1" << endl;
//    cout << "开发: BL_TURTLE's CansLC(2025/4/21,V2.1测试版)" << endl;
    cout << "想做什么? 使用[1] 使用Windows计算器[2] 退出[3] 功能介绍[4] 设置[5]" << endl;//新增设置 
    cin >> s;
    if (s == 1) {
        usec:
        cout << "加法[1]" << endl;
        cout << "减法[2]" << endl;
        cout << "乘法[3]" << endl;
        cout << "除法[4]" << endl;
        cout << "乘方[5]" << endl;
        cout << "显示时间[6]" << endl;
        cout << "回到主界面[7]" << endl;
        int sss,a,b;cin >> sss;
        if (sss == 1) {
            jia(a,b);
            cout << "回到哪里? 主界面[1] “使用”界面[2]" << endl;
            int gotowhere;cin >> gotowhere;
            if (gotowhere == 1) {
                cout << endl;
                goto mainc;
            }
            else if (gotowhere == 2) {
                cout << endl;
                goto usec;
            }
            else {
                cout << "输入错误(已经回到主页面)" << endl;
                goto mainc;
            }
        }
        else if (sss == 2) {
            jian(a,b);
            cout << "回到哪里? 主界面[1] “使用”界面[2]" << endl;
            int gotowhere;cin >> gotowhere;
            if (gotowhere == 1) {
                cout << endl;
                goto mainc;
            }
            else if (gotowhere == 2) {
                cout << endl;
                goto usec;
            }
            else {
                cout << "输入错误(已经回到主页面)" << endl;
                goto mainc;
            }
        }
        else if (sss == 3) {
            cheng(a,b);
            cout << "回到哪里? 主界面[1] “使用”界面[2]" << endl;
            int gotowhere;cin >> gotowhere;
            if (gotowhere == 1) {
                cout << endl;
                goto mainc;
            }
            else if (gotowhere == 2) {
                cout << endl;
                goto usec;
            }
            else {
                cout << "输入错误(已经回到主页面)" << endl;
                goto mainc;
            }
        }
        else if (sss == 4) {
            chu(a,b);
            cout << "回到哪里? 主界面[1] “使用”界面[2]" << endl;
            int gotowhere;cin >> gotowhere;
            if (gotowhere == 1) {
                cout << endl;
                goto mainc;
            }
            else if (gotowhere == 2) {
                cout << endl;
                goto usec;
            }
            else {
                cout << "输入错误(已经回到主页面)" << endl;
                goto mainc;
            }
        }
        else if (sss == 5) {
            chf(a,b);
            cout << "回到哪里? 主界面[1] “使用”界面[2]" << endl;
            int gotowhere;cin >> gotowhere;
            if (gotowhere == 1) {
                cout << endl;
                goto mainc;
            }
            else if (gotowhere == 2) {
                cout << endl;
                goto usec;
            }
            else {
                cout << "输入错误(已经回到主页面)" << endl;
                cout << endl;
                goto mainc;
            }
        }
        else if (sss == 6) {
        	cout << "因为开发人员技术Too Low,所以只能显示15秒的时间" << endl;
        	Sleep(1000);
        	cout << endl;
        	int Time = 15;
            while (Time--) {
                time_t rawtime;
                struct tm *timeinfo;
                char buffer[80];
                time(&rawtime);
                timeinfo = localtime(&rawtime);
                strftime(buffer,sizeof(buffer),"%H:%M:%S",timeinfo);
                cout << "\r" << buffer << flush;
                sleep(1);
            }
            cout << endl << endl;
            cout << "回到哪里? 主界面[1] “使用”界面[2]" << endl;
            int gotowhere;cin >> gotowhere;
            if (gotowhere == 1) {
                cout << endl;
                goto mainc;
            }
            else if (gotowhere == 2) {
                cout << endl;
                goto usec;
            }
            else {
                cout << "输入错误(已经回到主页面)" << endl;
                cout << endl;
                goto mainc;
			}
        }
        else if (sss == 7) {
            cout << endl;
            goto mainc;
        }
        else {
            cout << "输入错误(已经回到主页面)" << endl;
            cout << endl;
            goto mainc;
        }
    }
    else if (s == 2) {
        system("calc");
        cout << "还要继续? 要[1] 不要[2]" << endl;
        int ss;cin >> ss;
        if (ss == 1) {
            while (1) {
                system("calc");
            }
        }
        else if (ss == 2) {
            system("Color 0A");
            cout << endl;
            goto mainc;
        }
        else {
            cout << "输入错误(已经回到主页面)" << endl;
            goto mainc;
        }
    }
    else if (s == 3) {
        goto end;
    }
    else if (s == 4) {
        cout << "功能介绍:" << endl;
        cout << "·运算数字范围更大(运用 “long double”)" << endl;
        cout << "·选择想做什么用数字输入,取消符号输入" << endl;
        cout << "·如果不想使用这个计算器,用“使用Windows计算器”选项打开Windows计算器" << endl;
        cout << "·如果输入数字错误,将回到主界面而不是退出程序" << endl;
        cout << "·这个版本只能输入数字" << endl;//新增一条介绍 
        jieshao:
        cout << endl << "想做什么? 退出[1] 回到主界面[2]" << endl;
        int ss;cin >> ss;
        if (ss == 1) {
            goto end;
        }
        else if (ss == 2) {
            goto mainc;
        }
        else {
            cout << "输入错误(已经回到主页面)" << endl;
            goto mainc;
        }
    }
    else if (s == 5) {
        shezhi:
        cout << "设置页面:" << endl;
        cout << "[1]颜色设置" << endl;
        cout << "[2]使用教程" << endl;
        cout << "[3]关于" << endl;
        cout << "[4]离开" << endl;
        int ss;cin >> ss;
        if (ss == 1) {
            cout << "[1]系统(浅灰文字,黑色背景)" << endl;
            cout << "[2]绿色(绿色文字,黑色背景)" << endl;
            cout << "[3]蓝色(蓝色文字,黑色背景)" << endl;
            cout << "[4]青色(青色文字,黑色背景)" << endl;
            cout << "[5]退出至“设置”页面" << endl;
            cout << "注意暂时不可避免的错误:颜色发生变化后,屏幕上的一些文字会变多!" << endl;
            int ss;cin >> ss;
            if (ss == 1) {
                system("color 07");
                goto shezhi;
            }
            else if (ss == 2) {
                system("color 0A");
                goto shezhi;
            }
            else if (ss == 3) {
                system("color 09");
                goto shezhi;
            }
            else if (ss == 4) {
                system("color 0B");
                goto shezhi;
            }
            else if (ss == 5) {
                goto shezhi;
            }
            else {
                cout << "输入错误(已经回到主页面)" << endl;
                cout << endl;
                goto mainc;
            }
        }
        else if (ss == 2) {//设置里面的使用教程 
            cout << "C++98 CALC V2.1 的使用教程" << endl;
            cout << "·请在输入运算数据或选择数据时,仅输入数字,否则陷入死循环" << endl;
            cout << "·如果希望查看现在的时间,可以前往“使用”屏幕" << endl;
            cout << "·如果遇到了一些BUG或其他问题,请联系我们[现在输入3,查看“联系我们”],我们将会解决" << endl;
            cout << "回到哪里? 设置页面[1] 主屏幕[2]" << endl;
            int ss; cin >> ss;
            if (ss == 1) {
                cout << endl;
                goto shezhi;
            }
            else if (ss == 2) {
                cout << endl;
                goto mainc;
            }
            else if (ss == 3) {
                cout << endl;
                goto guanyv;
            }
            else {
                cout << "输入错误(已经回到主页面)" << endl;
                cout << endl;
                goto mainc;
            }
        }
        else if (ss == 3) {
            guanyv:
            cout << "关于C++98 CALC" << endl;
            cout << "版本: Calc V2.1" << endl;
            cout << "适用: Dev-C++5.11" << endl;
            cout << "开发: BL_TURTLE's CansLC(2025/4/25,V2.1正式版)" << endl;
            cout << "博客: https://blog.csdn.net/B142434?type=blog" << endl;
            cout << "洛谷: https://www.luogu.com.cn/user/1427890" << endl;
            cout << "B站UID: 3546609795205173" << endl;
            cout << "开发者的OJ: https://hydro.ac/d/BobOJ/" << endl;
            cout << "联系我们: 434443625@qq.com" << endl;
            cout << "退出至设置[1]" << endl;
            int ss; cin >> ss;
            if (ss == 1) {
                cout << endl;
                goto shezhi;
            }
            else {
                cout << "输入错误(已经回到主页面)" << endl;
                cout << endl;
                goto mainc;
            }
        }
        else if (ss == 4) {
            cout << endl;
            cout << endl;
            goto mainc;
        }
        else {
            cout << "输入错误(已经回到主页面)" << endl;
            cout << endl;
            goto mainc;
        }
    }
    else {
        cout << "输入错误(已经回到主页面)" << endl;
        cout << endl;
        goto mainc;
    }
    end:
    return 0;
}