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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: C89 "bug"
Date: Fri, 13 Dec 2024 10:15:32 -0800
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Thiago Adams <thiago.adams@gmail.com> writes:
> Does anyone knows how can I convert this code (external declaration) to C89?
>
> union U {
>     int i;
>     double d;
> };
>
> union U  u = {.d=1.2};
>
> The problem is that in C89 only the first member of the union is
> initialized.

The obvious solution is:
    union U u;
    u.d = 1.2;
But that works only if u has automatic storage duration.

You could also define a function that takes a double argument and
returns a union U result.

Of course the best solution is to use C99 or later, unless there's
some reason you can't.

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