#include <stdio.h>


int getBit(char c, int index)
{
	char value = c;	
	if(((value >> index) % 2)) return 1;

	return 0;
}


int getData(char *ptr, int index, int size)
{
	int var = 0;
	int bin = 1;
	
	int i = index;
	index += size;

	while(index > i) 
	{
		var += getBit(ptr[index/8], index%8) * bin;
	index--;
	}

	return var;
}


int main()
{
	char A[] = "ABBB";
        printf("%d.\n", getData(&A[0], 0, 7));
	return 0;
}