negative.cpp

#include <iostream>
#include <bitset>
#include <cstring>

void printBin(int num) 
{
	unsigned char arr[4] = {0,};
	char *ptr = reinterpret_cast<char *>(&num);
	std::memcpy(arr, ptr, sizeof(int));
	std::bitset<8> buf;

	std::cout << " " << num << " : 0b";
	for(auto i = 3; i >= 0; --i)
	{
		std::cout << std::bitset<8>(arr[i]);
	}
	std::cout << std::endl;
	std::cout << "!" << num << " : 0b";
	for(auto i = 3; i >=0; --i)
	{
		buf = std::bitset<8>(arr[i]);
		std::cout << buf.flip();
	}
	std::cout << std::endl;
}



int main() 
{
	for(auto i = -5; i <= 5; ++i)
		printBin(i);
}

How to Compile
g++ -std=c++11 -o negative negative.cpp