Program to show the implementation of Double Mouse Click

 # include <stdlib.h>
 # include  <stdio.h>
 # include  <conio.h>
 # include    <dos.h>

 const int InitMouse( );

 void ShowMouseCursor( );
 void HideMouseCursor( );

 void SetMousePosition(int x,int y);
 void GetMousePosition(int *x,int *y);

 void SetMouseHorizontalRange(int x_min,int x_max);
 void SetMouseVerticalRange(int y_min,int y_max);
 void SetMouseRange(int x_min,int y_min,int x_max,int y_max);

 const int LeftMouseKeyPressed( );
 const int RightMouseKeyPressed( );

 const int DoubleLeftMouseKeyPressed( );
 const int DoubleRightMouseKeyPressed( );

 const int GetClickTime( );

 void ShowSystemTime( );

 void ShowBorder( );

 int main( )
 {
    int x_cord;
    int y_cord;

    int prev_x_cord;
    int prev_y_cord;

    clrscr( );
    textmode(BW80);

    if(!InitMouse( ))
    {
       printf(\"Fatal Error : Unable to detect the Mouse.\");
       printf(\"\\nPress ANY key to exit...\");

       getch( );
       exit(1);
    }

    ShowBorder( );

    ShowMouseCursor( );
    SetMousePosition(320,100);
    SetMouseRange(16,24,623,183);

    gotoxy(1,25);
    printf(\"Note: Press Double Mouse Key to exit.\");

    do
    {
       ShowSystemTime( );
       GetMousePosition(&x_cord,&y_cord);

       if(x_cord!=prev_x_cord || y_cord!=prev_y_cord)
       {
      gotoxy(1,1);
      printf(\"Current Mouse Coordinates : ( x=%d , y=%d  )\",x_cord,y_cord);

      prev_x_cord=x_cord;
      prev_y_cord=y_cord;
       }

       if(DoubleLeftMouseKeyPressed( ))
      break;

       else if(DoubleRightMouseKeyPressed( ))
      break;

       if(kbhit( ))
      getch( );
    }
    while(1);

    return 0;
 }


 //---------------------------  ShowBorder( )  ---------------------------//


 void ShowBorder( )
 {
    int count;

    gotoxy(2,3);
    printf(\"ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»\");

    for(count=0;count<20;count++)
    {
       gotoxy(2,(4+count));
       printf(\"º                                                                            º\");
    }

    gotoxy(2,24);
    printf(\"ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ\");
 }


 //---------------------------  InitMouse( )  ----------------------------//


 const int InitMouse( )
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.x.ax=0x0000;

    int86(0x33,&InReg,&OutReg);

    if(OutReg.x.ax==0x0000 && OutReg.x.bx==0xFFFF)
       return 0;

    return 1;
 }


 //-------------------------  ShowMouseCursor( )  ------------------------//


 void ShowMouseCursor( )
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.x.ax=0x0001;

    int86(0x33,&InReg,&OutReg);
 }


 //-------------------------  HideMouseCursor( )  ------------------------//


 void HideMouseCursor( )
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.x.ax=0x0002;

    int86(0x33,&InReg,&OutReg);
 }


 //------------------------  SetMousePosition( )  ------------------------//


 void SetMousePosition(int x,int y)
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.x.ax=0x0004;
    InReg.x.cx=x;
    InReg.x.dx=y;

    int86(0x33,&InReg,&OutReg);
 }


 //-------------------------  GetMousePosition( )  -----------------------//


 void GetMousePosition(int *x,int *y)
 {
    union REGS InReg;
    union REGS OutReg;

    *x=0;
    *y=0;

    InReg.x.ax=0x0003;

    int86(0x33,&InReg,&OutReg);

    *x=OutReg.x.cx;
    *y=OutReg.x.dx;
 }


 //----------------------  SetMouseHorizontalRange( )  -------------------//


 void SetMouseHorizontalRange(int x_min,int x_max)
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.x.ax=0x0007;
    InReg.x.cx=x_min;
    InReg.x.dx=x_max;

    int86(0x33,&InReg,&OutReg);
 }


 //----------------------  SetMouseVerticalRange( )  ---------------------//


 void SetMouseVerticalRange(int y_min,int y_max)
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.x.ax=0x0008;
    InReg.x.cx=y_min;
    InReg.x.dx=y_max;

    int86(0x33,&InReg,&OutReg);
 }


 //--------------------------  SetMouseRange( )  -------------------------//


 void SetMouseRange(int x_min,int y_min,int x_max,int y_max)
 {
    SetMouseVerticalRange(y_min,y_max);
    SetMouseHorizontalRange(x_min,x_max);
 }


 //----------------------  LeftMouseKeyPressed( )  -----------------------//


 const int LeftMouseKeyPressed( )
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.x.ax=0x0003;

    int86(0x33,&InReg,&OutReg);

    return ((OutReg.x.bx==0x0001)?1:0);
 }


 //----------------------  RightMouseKeyPressed( )  ----------------------//


 const int RightMouseKeyPressed( )
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.x.ax=0x0003;

    int86(0x33,&InReg,&OutReg);

    return ((OutReg.x.bx==0x0002)?1:0);
 }


 //-------------------  DoubleLeftMouseKeyPressed( )  --------------------//


 const int DoubleLeftMouseKeyPressed( )
 {
    long first_click_time=0;
    long second_click_time=0;

    if(LeftMouseKeyPressed( ))
    {
       first_click_time=GetClickTime( );

       while(LeftMouseKeyPressed( ));

       do
       {
      second_click_time=GetClickTime( );
      second_click_time+=((GetClickTime( )<first_click_time)?100:0);

      if(LeftMouseKeyPressed( ))
      {
         while(LeftMouseKeyPressed( ));

         return 1;
      }
       }
       while((second_click_time-first_click_time)<25);
    }

    return 0;
 }


 //-------------------  DoubleRightMouseKeyPressed( )  -------------------//


 const int DoubleRightMouseKeyPressed( )
 {
    long first_click_time=0;
    long second_click_time=0;

    if(RightMouseKeyPressed( ))
    {
       first_click_time=GetClickTime( );

       while(RightMouseKeyPressed( ));

       do
       {
      second_click_time=GetClickTime( );
      second_click_time+=((GetClickTime( )<first_click_time)?100:0);

      if(RightMouseKeyPressed( ))
      {
         while(RightMouseKeyPressed( ));

         return 1;
      }
       }
       while((second_click_time-first_click_time)<25);
    }

    return 0;
 }


 //--------------------------  GetClickTime( )  --------------------------//


 const int GetClickTime( )
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.h.ah=0x2C;

    int86(0x21,&InReg,&OutReg);

    return OutReg.h.dl;
 }


 //-------------------------  ShowSystemTime( )  -------------------------//


 int prev_hr=0;
 int prev_min=0;
 int prev_sec=0;

 void ShowSystemTime( )
 {
    union REGS InReg;
    union REGS OutReg;

    InReg.h.ah=0x2C;

    int86(0x21,&InReg,&OutReg);

    if(prev_hr!=(int)OutReg.h.ch || prev_min!=(int)OutReg.h.cl ||
                         prev_sec!=(int)OutReg.h.dh)
    {
       gotoxy(67,2);
       printf(\"             \");

       gotoxy(67,2);

       if((int)OutReg.h.ch>9)
      printf(\"%d\",(int)OutReg.h.ch);

       else
      printf(\"0%d\",(int)OutReg.h.ch);

       printf(\" : \");

       if((int)OutReg.h.cl>9)
      printf(\"%d\",(int)OutReg.h.cl);

       else
      printf(\"0%d\",(int)OutReg.h.cl);

       printf(\" : \");

       if((int)OutReg.h.dh>9)
      printf(\"%d\",(int)OutReg.h.dh);

       else
      printf(\"0%d\",(int)OutReg.h.dh);

       prev_hr=(int)OutReg.h.ch;
       prev_min=(int)OutReg.h.cl;
       prev_sec=(int)OutReg.h.dh;
    }
 }