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| -rw-r--r-- | doc/go_faq.html | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/doc/go_faq.html b/doc/go_faq.html index 50108c075b..905bf9c9a3 100644 --- a/doc/go_faq.html +++ b/doc/go_faq.html @@ -1262,11 +1262,17 @@ size of value should use an explicitly sized type, like <code>int64</code>. Prior to Go 1.1, the 64-bit Go compilers (both gc and gccgo) used a 32-bit representation for <code>int</code>. As of Go 1.1 they use a 64-bit representation. +</p> + +<p> On the other hand, floating-point scalars and complex -numbers are always sized: <code>float32</code>, <code>complex64</code>, -etc., because programmers should be aware of precision when using -floating-point numbers. -The default size of a floating-point constant is <code>float64</code>. +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>. </p> <h3 id="stack_or_heap"> |