Program to show the Basic Mouse Handling in Text Mode

 # 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( );

 void show_border( );

 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);
    }

    show_border( );

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

    gotoxy(1,25);
    printf(\"Note: Press ANY key to exit.\");

    do
    {
       GetMousePosition(&x_cord,&y_cord);

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

      prev_x_cord=x_cord;
      prev_y_cord=y_cord;
       }

       if(LeftMouseKeyPressed( ))
       {
      gotoxy(1,2);
      printf(\"*** Left Mouse Key Pressed\");

      while(LeftMouseKeyPressed( ));

      gotoxy(1,2);
      printf(\"                           \");
       }

       if(RightMouseKeyPressed( ))
       {
      gotoxy(1,2);
      printf(\"*** Right Mouse Key Pressed\");

      while(RightMouseKeyPressed( ));

      gotoxy(1,2);
      printf(\"                           \");
       }
    }
    while(!kbhit( ));

    getch( );
    return 0;
 }


 //--------------------------  show_border( )  ---------------------------//


 void show_border( )
 {
    int i;

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

    for(i=0;i<20;i++)
    {
       gotoxy(2,(4+i));
       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);
 }