C Floating point arithmetic

[Roger Rose]

>>	float a,b;
>>
>>	a = b + 1.0;	/* Gets done in double because 1.0 is a double.
>>			Gag me with a spoon. */
>
> Nah, gets done in single because the compiler realizes that 1.0 has
> the same representation in single and double, and therefore that
> the result of the addition will be the same.

Sorry, it get's done in double.  ALL floats are converted to double prior
to any operation.  (Refer to K&R p. 41 on implicit type conversions.)
-- 

Roger Rose
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