What happens if you exceeds the maxium value of short int(c++)?

Question

What value will I get with this code for example,

short int num = 32766
num + 5 = ?

Maxium value for short int is 32767.

UB is UB is a potential [release of the kraken](http://coliru.stacked-crooked.com/a/a7f7ba72c4f268e8). — jaggedSpire, Jan 12 '17 at 17:25
@jaggedSpire Well that's interesting. I guess that I should stick to C if I want the wrapping-around then? — synchronizer, Jan 12 '17 at 17:27
@synchronizer it's [UB in C too](http://stackoverflow.com/questions/4240748/allowing-signed-integer-overflows-in-c-c) — jaggedSpire, Jan 12 '17 at 17:27

score 4 · Answer 1 · answered Jan 12 '17 at 17:29

4

Signed integer overflow is undefined behavior.

answered Jan 12 '17 at 17:29

AMA

If I have to give it a value, would that be 0 then? – Markus Fürst Jan 12 '17 at 17:31
3

@MarkusFürst The thing about undefined behavior is that we don't know what it will be. It depends on the compiler. – Mikel F Jan 12 '17 at 17:32
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@MarkusFürst don't give UB any values please, it does not deserve them, it is a nasty beast :) – AMA Jan 12 '17 at 17:33
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@MarkusFürst that's like assigning a numeric value to a banana, except less sensible. – jaggedSpire Jan 12 '17 at 17:39
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@MarkusFürst - You can't reason about a C++ program that is exhibiting undefined behaviour - follow that link and read about what compilers will do to such programs (and then follow the other links). – Martin Bonner supports Monica Jan 12 '17 at 17:55

1 Answers1