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How do I detect if an integer has under- or

overflowed?

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unsigned x = 0 ; unsigned newx = x -1; if (newx > x)

Shlomi Fish
unsigned x = 0 ; unsigned newx = x -1; if (newx > ...

- actually if you got the number from SCANF or CIN you cant know the "original" number so i guess that you cant detect that over / under flow

Nils- Автор вопроса
Shlomi Fish
unsigned x = 0 ; unsigned newx = x -1; if (newx > ...

Not actually what if the overflow or underflow causes the number to be larger or higher than the reference?

Nils
Not actually what if the overflow or underflow cau...

IT CAN BE IN ONLY A FEW CASES THAT YOU CAN PREDICT

Nils- Автор вопроса
Idan
IT CAN BE IN ONLY A FEW CASES THAT YOU CAN PREDICT

Imagine this... uint x = 123; x += UNSIGNED_INT_MAX; and x will still be 123 even though it overflowed

Nils
Not actually what if the overflow or underflow cau...

The C++ standard specifies that any unsigned integer that overflows acts like number % (UINT_MAX + 1). Its completely assured when you overflow you start over from 0 with the remainder.

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