#include<dos.h>
#include<conio.h>
#include<string.h>
#include<math.h>
#include<stdlib.h>
#include<stdio.h>
#define HEX 0
#define DEC 1
#define OCT 2
#define BIN 3

int index=0,choice=0;
/*初始化鼠标器*/
void initmouse()
{
 _AX=0;
 geninterrupt(0x33);

}
/*显示鼠标光标*/
void showmouse()
{
 _AX=1;
 geninterrupt(0x33);
}
/*隐藏鼠标*/
void hidemouse()
{
 _AX=2;
 geninterrupt(0x33);
}
/*取鼠标状态和鼠标位置*/
void getmouse(int *button,int *x,int *y)
{
 _AX=3;
 _BX=0;
 geninterrupt(0x33);
 *button=_BL;
 *x=_CX;
 *y=_DX;
}
/*设置程序中的数字字符表*/
int getnum(char c)
{
 int j;
 char alpha_set[36]="0123456789abcdefghijklmnopqrstuvwzyz";
 for(j=0;j<36;j++)
 {
  if(alpha_set[j]==c)
   break;
 }
 return j;
}
/*把任意radix进制的数，转换为十进制数*/
unsigned long convert_to_decimal(char *_num,int radix)
{
 int i,len;
 unsigned long dec=0;
 len=strlen(_num);
 len--;
 for(i=0;_num[i]!=NULL;i++,len--)
 {
  dec+=(getnum(_num[i])*pow(radix,len));
 }
 return dec;
}
/*在给定的坐标(x,y)的位置显示一个字符串*/
void display(int x,int y,char string[80])
{ gotoxy(x,y);
 cprintf(string);
}
/*清屏，并且把背景色设置为青绿色*/
void make_screen_cyan()
{
 textbackground(CYAN);
 clrscr();
}
/*绘制程序的初始界面*/
void start_screen()
{
 index=0;
 hidemouse();
 make_screen_cyan();
 textbackground(RED);
 textcolor(BLACK);
 display(20,1,"Radix Converter by NILOY MONDAL.");
 display(10,2,"Email:-yiwei@zju.edu.cn");
 display(30,3,"Press Escape to Quit");
 textbackground(CYAN);
 display(10,5,"Hexadecimal:- ");
 display(10,7,"Decimal    :- ");
 display(10,9,"Octal      :- ");
 display(10,11,"Binary     :- ");
 textbackground(BLUE);
 display(23,5,"                                                      ");
 display(23,7,"                                                      ");
 display(23,9,"                                                      ");
 display(23,11,"                                                      ");
 if(choice==HEX)
  gotoxy(24,5);
 else if(choice==DEC)
  gotoxy(24,7);
 else if(choice==OCT)
  gotoxy(24,9);
 else if(choice==BIN)
  gotoxy(24,11);
 showmouse();
}

void main()
{
 char text[80]="\0",buffer[80];
 char ch,*charhex,*chardec,*charoct,*charbin;
 int button,mousex,mousey,x,y;
 unsigned long deci;

 initmouse();
 start_screen();
 showmouse();
 while(1)
 {
  if(kbhit())
  {
   ch=getch();
/*ESCAPE键的ASCII值是27，如果用户按下ESC，程序结束*/
   if(ch==27)  
    break;
/*如果按删除键并且光标没有越过输入框的边界*/
   if(ch=='\b'&&wherex()>=24)  
   {
/*把光标退后一格，并且放一个空格在那里*/
    cprintf("\b");
    cprintf("%c",255);
/*再把光标退后一格，弹出删除的字符*/
    cprintf("\b");
    if(index!=0)
     index--;   
    text[index]=NULL;
   }
   else if(wherex()>=24&&ch>='0'&&ch<='f')
   {
    cprintf("%c",ch);
/*把字符放入字符数组*/
    text[index]=ch;   
/*把数组最后一位置零*/
    text[index+1]=NULL; 
    index++;
   }
/*保存当前的坐标*/
   x=wherex(),y=wherey();
/*程序首先把字符串通过convert_to_decimal()转化为十进制数，之后调用stdlib.h定义的ltoa()把十进制数转换为其它进制数，比如二进制、八进制、十六进制等等.*/
   switch(choice)
   {
    case HEX:
     deci=convert_to_decimal(text,16);
     gotoxy(24,7);
     printf("%ld                             ",deci);
     gotoxy(24,11);
     printf("%s                              ",ltoa(deci,buffer,2));
     gotoxy(24,9);
     printf("%s                              ",ltoa(deci,buffer,8));
     break;
    case DEC:
     deci=atol(text);
     gotoxy(24,5);
     printf("%s                             ",ltoa(deci,buffer,16));
     gotoxy(24,9);
     printf("%s                             ",ltoa(deci,buffer,8));
     gotoxy(24,11);
     printf("%s                             ",ltoa(deci,buffer,2));
     break;
    case OCT:
     deci=convert_to_decimal(text,8);
     gotoxy(24,7);
     printf("%ld                             ",deci);
     gotoxy(24,5);
     printf("%s                             ",ltoa(deci,buffer,16));
     gotoxy(24,11);
     printf("%s                              ",ltoa(deci,buffer,2));
     break;
    case BIN:
     deci=convert_to_decimal(text,2);
     gotoxy(24,5);
     printf("%s                            ",ltoa(deci,buffer,16));
     gotoxy(24,7);
     printf("%ld                            ",deci);
     gotoxy(24,9);
     printf("%s                            ",ltoa(deci,buffer,8));
     break;
   }
   gotoxy(x,y);
  }
  getmouse(&button,&mousex,&mousey);
  mousex++,mousey++;
/*下面的代码检测用户在什么地方按了什么按钮*/
  if(mousex/8>23&&mousex/8<50&&mousey/16==2&&button&1==1)
  {
   choice=HEX;
   start_screen();
  }
  else if(mousex/8>23&&mousex/8<50&&mousey/16==3&&button&1==1)
  {
   choice=DEC;
   start_screen();
  }

  else if(mousex/8>23&&mousex/8<50&&mousey/16==4&&button&1==1)
  {
   choice=OCT;
   start_screen();
  }
  else if(mousex/8>23&&mousex/8<50&&mousey/16==5&&button&1==1)
  {
   choice=BIN;
   start_screen();
  }
 }

}

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