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doc: more tweaks to the FAQ

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Change-Id: I0a3726f841122643bd1680ef6bd450c2039f362b
Reviewed-on: https://go-review.googlesource.com/28213
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Robert Griesemer 2016-08-30 17:09:30 -07:00
parent 859cab099c
commit 6ebacf18a5
1 changed files with 13 additions and 4 deletions
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doc/go_faq.html
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@ -1269,10 +1269,19 @@ On the other hand, floating-point scalars and complex
types are always sized (there are no <code>float</code> or <code>complex</code> basic types),
because programmers should be aware of precision when using floating-point numbers.
The default type used for an (untyped) floating-point constant is <code>float64</code>.
Thus <code>foo := 3.0</code> declares a variable <code>foo</code> of type <code>float64</code>.
For a <code>float32</code> variable initialized by a constant, the variable type must be specified explicitly
in the variable declaration <code>var foo float32 = 3.0</code>, or the constant must be given a
type with a conversion as in <code>foo := float32(3.0)</code>.
Thus <code>foo</code> <code>:=</code> <code>3.0</code> declares a variable <code>foo</code>
of type <code>float64</code>.
For a <code>float32</code> variable initialized by an (untyped) constant, the variable type
must be specified explicitly in the variable declaration:
</p>
<pre>
var foo float32 = 3.0
</pre>
<p>
Alternatively, the constant must be given a type with a conversion as in
<code>foo := float32(3.0)</code>.
</p>
<h3 id="stack_or_heap">