> What are the rules in C when you compare a double
> variable with a single constant?
>
> void foo(double d)
> {
> /* Does d get converted to single, or does 0.0f get converted to
> * double?
> */
> if (d == 0.0f)
> printf("zero\n");
> }
The 0.0f is converted to a double. One site [1] has a likely looking
reference. :) Sadly, I don't know how to check the C spec directly (I
think that it is not free).
[1] https://www.eskimo.com/~scs/cclass/int/sx4cb.html
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