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From: bart <bc@freeuk.com>
Newsgroups: comp.lang.c
Subject: Re: "A diagram of C23 basic types"
Date: Mon, 7 Apr 2025 19:02:34 +0100
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On 04/04/2025 04:01, Lawrence D'Oliveiro wrote:
> 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?

Try 20 * BILLION; it will overflow if not careful.

I'd normally write '20 billion' outside of C, since I use such numbers, 
with lots of zeros, constantly when writing test code.

But when it isn't all zeros, or the base isn't 10, then numeric 
separators are better.