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description Learn more about: Arithmetic overflow: '%operator%' operation produces a negative unsigned result at compile time
title C26454
keywords C26454
ms.date 01/08/2017
ms.topic reference
f1_keywords
C26454
helpviewer_keywords
C26454
dev_langs
C++

Arithmetic overflow: '%operator%' operation produces a negative unsigned result at compile time

This warning indicates that the subtraction operation produces a negative result which was evaluated in an unsigned context. This can result in unintended overflows.

Example

unsigned int negativeunsigned()
{
    const unsigned int x = 1u - 2u; // C26454 reported here
    return x;
}

To correct this warning, use the following code:

unsigned int negativeunsigned()
{
    const unsigned int x = 4294967295; // OK
    return x;
}

See also

ES.106: Don't try to avoid negative values by using unsigned