int fromTwoComp(int input)
{
	int mask = 1 << 31; // but 1 in the first bit
	int neg = (input & mask);

	if(neg == mask) //if first bit of neg is 1 then input is negative
	{
		input -= 1;
		input = 1 - input; //swap 0 and 1
		input = input | mask; //make first bit 1
		return input;
	}
	else //not negative, its just like normal binary
	{
		return input;
	}
}