Assuming two's complement:
Whenever you OR any number with a negative number the result is negative. This is because the sign bit is set in the negative number and therefor will be set in the resulting number.
Pergunta
So what happens when you OR two negative numbers? Is it ever guaranteed that whenever you OR a positive with a negative, the result will be positive?
Solução
Assuming two's complement:
Whenever you OR any number with a negative number the result is negative. This is because the sign bit is set in the negative number and therefor will be set in the resulting number.