Press Me Button Game in C

/* 
Write a program for Press me button game in C
 */

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

union REGS i, o;
int left = 265, top = 250;

void initialize_graphics_mode()
{
int gd = DETECT, gm, error;

initgraph(&gd,&gm,"C:\\TC\\BGI");

error = graphresult();

if( error != grOk )
{
perror("Error ");
printf("Press any key to exit...\n");
getch();
exit(EXIT_FAILURE);
}
}

void showmouseptr()
{
i.x.ax = 1;
int86(0x33,&i,&o);
}

void hidemouseptr()
{
i.x.ax = 2;
int86(0x33,&i,&o);
}

void getmousepos(int *x,int *y)
{
i.x.ax = 3;
int86(0x33,&i,&o);

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

void draw_bar()
{
hidemouseptr();
setfillstyle(SOLID_FILL,CYAN);
bar(190,180,450,350);
showmouseptr();
}

void draw_button(int x, int y)
{
hidemouseptr();
setfillstyle(SOLID_FILL,MAGENTA);
bar(x,y,x+100,y+30);
moveto(x+5,y);
setcolor(YELLOW);
outtext("Press me");
showmouseptr();
}

void draw()
{
settextstyle(SANS_SERIF_FONT,HORIZ_DIR,2);
outtextxy(155,451,"www.cprogrammingworld123.blogspot.in");
setcolor(BLUE);
rectangle(0,0,639,450);
setcolor(RED);
outtextxy(160,25,"Try to press the \"Press me\" button");
outtextxy(210,50,"Press escape key to exit");
setfillstyle(XHATCH_FILL,GREEN);
setcolor(BLUE);
bar(1,1,75,449);
bar(565,1,638,449);
showmouseptr();
draw_bar();
draw_button(left,top);
}

void initialize()
{
initialize_graphics_mode();

if( !initmouse() )
{
closegraph();
printf("Unable to initialize the mouse");
printf("Press any key to exit...\n");
getch();
exit(EXIT_SUCCESS);
}

draw();
}

int initmouse()
{
i.x.ax = 0;
int86(0x33,&i,&o);
return ( o.x.ax );
}

void get_input()
{
int x, y;

while(1)
{
getmousepos(&x,&y);

/* mouse pointer in left of button */

if( x >= (left-3) && y >= (top-3) && y <= (top+30+3) && x < left )
{
draw_bar();
left = left + 4;

if( left > 350 )
left = 190;

draw_button(left,top);
}

/* mouse pointer in right of button */

else if( x <= (left+100+3) && y >= (top-3) && y <= (top+30+3) && x>(left+100))
{
draw_bar();
left = left - 4;

if( left < 190 )
left = 350;

draw_button(left,top);
}

/* mouse pointer above button */

else if( x >= (left-3) && y >= (top-3) && y < (top) && x<=(left+100+3))
{
draw_bar();
top = top + 4;

if( top > 320 )
top = 180;

draw_button(left,top);
}

/* mouse pointer below button */

else if( x >= (left-3) && y > (top+30) && y <= (top+30+3) && x<=(left+100+3))
{
draw_bar();
top = top - 4;

if( top < 180 )
top = 320;

draw_button(left,top);
}

if(kbhit())
{
if( getkey() == 1 )
exit(EXIT_SUCCESS);
}
}
}

int getkey()
{
i.h.ah = 0;
int86(22,&i,&o);

return( o.h.ah );
}

main()
{
initialize();

get_input();
return 0;
}