h2.c

#include 

int main(void)
{
	int i, num, bit ,length;
	printf("please input num: ");
	scanf("%x", &num);
	printf("please input bit: ");
	scanf("%d", &bit);
	printf("please input length: ");
	scanf("%d", &length);

	i = ((1 << length) - 1) & (num >> (bit - length + 1));
	printf("The bit is: %x \n", i);

	return 0;
}