#include <iostream>
#include <climits>
#include <limits>
#include <bitset>
#include <cassert>
 
bool is_null(int n)
{
	size_t bit_sum = 0;
 
	const int bit_size = sizeof(int) * CHAR_BIT;
	std::bitset<bit_size> bits(n);
 
	for(size_t i = 0; i < bits.size(); ++i)
	{
		bit_sum += bits[i];
	}
 
	return bit_sum == 0;
}
 
int main()
{
	assert(is_null(0) == true);
 
	assert(is_null(1) == false);
	assert(is_null(-1) == false);
 
	assert(is_null(std::numeric_limits<int>::min()) == false);
	assert(is_null(std::numeric_limits<int>::max()) == false);
 
	return 0;
}

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