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

void main(void)
{
unsigned int a, b, mask=1;
int n;	char lr;

do { clrscr();      //do-while
	printf("Enter the SIDE from which to start "
					"(L: Left, R:Right)... ");
	lr=getch();
	} while(lr!='l' && lr!='L' && lr!='r' && lr!='R');
	if(lr=='L') lr='l'; if(lr=='R') lr='r';

while(1) 	{
	if(lr=='r')
		printf("\nEnter the no. to be ***"
					" (greater than 511):  ");
	if(lr=='l')
		printf("\nEnter the no. to be *** "
						"(less than 128):  ");
	scanf("%d",&a);
	if(lr=='r' && a>511)	break;
	else if(lr=='l' && a<128)	break;
	else continue;
	}
do {  printf("Enter the no. bits (1 to 16) ");
	 scanf("%d",&n);      } while(n<0 || n>16);

mask<<=n;
mask-=1;
b = a & mask;

printf("%u\n",b);
puts("O/P is:");
int i=0;
a=wherey();
while(b!=0)  	{
	gotoxy(n-i , a);
	printf("%d",b%2);
	b/=2;
	i++;
	}
while((n-i)!=0)  	{
	gotoxy(n-i , a);
	printf("0");
	i++;
	}	printf("\n");
while(!kbhit()) ;   //getch();
}