long _10_to_2_(int x) {
	
	int i;
	int mod;
	long double_ = 0;

	for (i = 0; x>0; i++) {
	
		mod =  x % 2;
		x = (x - mod) / 2;
		double_ += mod * pow((double)10,i);
	}
	return double_;

}