Found a bug in my code and noticed the following, when subtracting 2 numbers like
unsigned int a, b (with b > a)
signed long result = a - b
The result is always positive, even though b is larger. I expected that since result is signed, the result would be converted to signed too, but apparently not. How can i fix this?
The problem is, your math is happening -- with unsigned ints, resulting in an unsigned int -- before the value is converted to a long. When an unsigned type is converted to a larger signed type, the value doesn't change. So your result will only ever have a chance of being negative if long and int are the same size.
Try converting at least one of your values to a long before you do your math. That should be enough to get your result to be signed.