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c++coding-style

What do you usually use int value, '255' and hexadecimal value, '0xff' on c++?

Is there a performance issue or any other reason?

Solution

  • There is absolutely no performance benefit in using one over the other, but note that the use of a hexadecimal literal means that the implied type can include unsigned integral types, (cf. decimal literals which can't) and that can have surprising effects:

    void foo(const unsigned&)
{
    // pay me a bonus
}

void foo(const long&)
{
    // reformat my hard disk
}

int main()
{
    foo(0xffffffff); // thankfully unsigned on a platform with 32 bit int.
}

    See http://en.cppreference.com/w/cpp/language/integer_literal, including the link to C at the bottom of that page.