count 1 bits

count_one_bit.cpp

#include <iostream>

size_t count_one_bit(uint64_t num)
{
	size_t count = 0x0;

	while (num > 0x0)
	{
		if ((num & 0x01) != 0)
		{
			count++;
		}
		num >>= 0x01;
	}

	return count;
}


int main()
{
	std::cout << count_one_bit(0xFF) << std::endl;
	std::cout << count_one_bit(1) << std::endl;
	std::cout << count_one_bit(56) << std::endl;
	std::cout << count_one_bit(10) << std::endl;
	std::cout << count_one_bit(100) << std::endl;
	std::cout << count_one_bit(0b11010101010) << std::endl;
	std::cout << count_one_bit(0b11010111010) << std::endl;
	std::cout << "-----------------------------" << std::endl;
}