Re: "A diagram of C23 basic types"

Lawrence D'Oliveiro <ldo@nz.invalid> writes:

On Wed, 2 Apr 2025 16:33:46 +0100, bart wrote:

Here, tell me at a glance the magnitude of
this number:
 
     10000000000

>
    #define THOUSAND 1000
    #define MILLION (THOUSAND * THOUSAND)
    #define BILLION (THOUSAND * MILLION)
>
    uint64 num = 10 * BILLION;
>
Much easier to figure out, don’t you think?

On my system (when I change uint64 to uint64_t and add the
appropriate #include directives) I get a compile-time warning and num
is 1410065408.  On a system with 16-bit int (uncommon outside small
embedded systems these days), THOUSAND * THOUSAND would overflow.

Whereas 10000000000 (or 10'000'000'000) will have a type big enough
to hold its value.

--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */