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spec: more explicit comments for constant expression examples

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Fixes #3814.

R=rsc, iant
CC=golang-dev
https://golang.org/cl/6920057
This commit is contained in:
Robert Griesemer 2012-12-12 14:25:40 -08:00
parent a9a49fe962
commit 462860bd8d
1 changed files with 8 additions and 8 deletions
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16
doc/go_spec.html
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@ -3706,8 +3706,8 @@ an untyped complex constant.
</p>
<pre>
const ic = complex(0, c) // ic == 3.75i (untyped complex constant)
const iΘ = complex(0, Θ) // iΘ == 1.5i (type complex128)
const ic = complex(0, c) // ic == 3.75i (untyped complex constant)
const iΘ = complex(0, Θ) // iΘ == 1.5i (type complex128)
</pre>
<p>
@ -3717,8 +3717,8 @@ by any predeclared type in the language. The following are legal declarations:
</p>
<pre>
const Huge = 1 &lt;&lt; 100
const Four int8 = Huge &gt;&gt; 98
const Huge = 1 &lt;&lt; 100 // Huge == 1267650600228229401496703205376 (untyped integer constant)
const Four int8 = Huge &gt;&gt; 98 // Four == 4 (type int8)
</pre>
<p>
@ -3737,9 +3737,9 @@ of the constant type. The following constant expressions are illegal:
<pre>
uint(-1) // -1 cannot be represented as a uint
int(3.14) // 3.14 cannot be represented as an int
int64(Huge) // 1&lt;&lt;100 cannot be represented as an int64
Four * 300 // 300 cannot be represented as an int8
Four * 100 // 400 cannot be represented as an int8
int64(Huge) // 1267650600228229401496703205376 cannot be represented as an int64
Four * 300 // operand 300 cannot be represented as an int8 (type of Four)
Four * 100 // product 400 cannot be represented as an int8 (type of Four)
</pre>
<p>
@ -3750,7 +3750,7 @@ and -1 for signed and untyped constants.
<pre>
^1 // untyped integer constant, equal to -2
uint8(^1) // error, same as uint8(-2), out of range
uint8(^1) // illegal: same as uint8(-2), -2 cannot be represented as a uint8
^uint8(1) // typed uint8 constant, same as 0xFF ^ uint8(1) = uint8(0xFE)
int8(^1) // same as int8(-2)
^int8(1) // same as -1 ^ int8(1) = -2