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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c++
Subject: Re: Don't be fooled by cpp.sh
Date: Mon, 16 Dec 2019 22:29:57 -0800
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Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
[...]
> intmax_t is useful, in part because it solves the printf problem.  You
> can portably print any integer i using
>
>   printf("%ld\n", (intmax_t)i);

You mean "%jd\n".

> whether i is an extended type like __int128 or even some weird 99-bit
> integer type.

To be completely sure, you need to use either intmax_t or uintmax_t
depending on whether the argument is signed or unsigned.  If you
have a name for the type, you can do something like

    big_type i = some_value;
    if ((big_type)-1 > (big_type)0) {
        printf("%ju\n", (uintmax_t)i);
    }
    else {
        printf("%jd\n", (intmax_t)i);
    }

But quite often you'll know from context whether the type is signed or
unsigned, even if you don't know which type it is.

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
    [Note updated email address]
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */