Catch-The-Blocks

#include<stdio.h>
#include<graphics.h>
#include<dos.h>
#include<conio.h>
int main()
{
int gd = DETECT,gm;
char c, buff[15];
int score=0,o=0,miss=0;
int x=400,y=200,i=1,k=0,ya=275,yb=125;
int ch=ya,ch1=yb;
int x1=x+320;
int timer,speed;
initgraph(&gd, &gm, "C:\\TC\\BGI");
setbkcolor(4);
printf("Game length (seconds) : ");
scanf("%d",&timer);
printf("Game speed (default 10) : ");
scanf("%d",&speed);
timer=timer*100;
while(i<timer)
{

cleardevice();
if(miss==50)
    goto sos;
x=x-speed+2;
if(x<0)
{
x=640;
 if(rand()%2==0)
    ch=ya;
 else
    ch=yb;

}
if(x==40)
{{if((ch>y-70)&&(ch<y+20))
score++;
else
    miss++;
}
}
setcolor(14);
rectangle(x,ch,x+50,ch+50);

x1=x1-speed+2;
if(x1<0)
{
x1=640;
 if(rand()%2==0)
    ch1=ya;
 else
    ch1=yb;



}
setcolor(14);
rectangle(x1,ch1,x1+50,ch1+50);
if(x1==40)
{{if((ch1>y-70)&&(ch1<y+20))
score++;
else
    miss++;
}
}
if(kbhit()!=0)
{c=getch();
    if(c=='P')
	y=(y+speed+2)%640;
if(c=='H')
    {
	y=y-speed-2;
	if(y<0) y=640;
    }
}

circle(20,y,20);

delay(10);

i++;
}
sos:closegraph();
printf("Enter 1 to know your score : ");
scanf("%d",&o);
if(o==1)
printf("Your score is %d out of %d.",score,score+miss);
getch();
return 0;



}