#Define ROUND_DOWN(s) ~(s) int main() { cout<<sizeof(10)<<endl; // 4 cout<<ROUND_DOWN(22); // -23

Question

#Define ROUND_DOWN(s) ~(s) int main() { cout<<sizeof(10)<<endl; // 4 cout<<ROUND_DOWN(22); // -23

cout<<ROUND_DOWN(10); // -11

return 0;
}
hi guys
tilde is bit inversion but in macro has different behaviour
why its printed negative incremented by one?

0

03.09.2019

2 ответов

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swarnim

Cause there is no negative zero see 2's complement

0

03.09.2019

Andrea Biagiao · Accepted Answer

Andrea Biagiao

Have a look a 2-complement on Wikipedia

0

03.09.2019

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#Define ROUND_DOWN(s) ~(s) int main() { cout<<sizeof(10)<<endl; // 4 cout<<ROUND_DOWN(22); // -23

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