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<title>2.4.5 Floating point literals
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<H2><A NAME=
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2.4.5 Floating point literals
Floating point literals are described by the following lexical
<div class=
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<td><a id='tok-floatnumber' xml:id='tok-floatnumber'
>floatnumber
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<td><a class='grammartoken'
href=
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</a> |
<a class='grammartoken'
href=
"floating.html#tok-exponentfloat">exponentfloat
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<td><a id='tok-pointfloat' xml:id='tok-pointfloat'
>pointfloat
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<td>[
<a class='grammartoken'
href=
"floating.html#tok-intpart">intpart
</a>]
<a class='grammartoken'
href=
"floating.html#tok-fraction">fraction
</a> |
<a class='grammartoken'
href=
"floating.html#tok-intpart">intpart
</a> "."</td></tr>
<td><a id='tok-exponentfloat' xml:id='tok-exponentfloat'
>exponentfloat
</a></td>
<td>(
<a class='grammartoken'
href=
"floating.html#tok-intpart">intpart
</a> |
<a class='grammartoken'
href=
"floating.html#tok-pointfloat">pointfloat
</a>)
<a class='grammartoken'
href=
"floating.html#tok-exponent">exponent
</a></td></tr>
<td><a id='tok-intpart' xml:id='tok-intpart'
>intpart
</a></td>
<td><a class='grammartoken'
href=
"identifiers.html#tok-digit">digit
</a>+
</td></tr>
<td><a id='tok-fraction' xml:id='tok-fraction'
>fraction
</a></td>
<td>"." <a class='grammartoken'
href=
"identifiers.html#tok-digit">digit
</a>+
</td></tr>
<td><a id='tok-exponent' xml:id='tok-exponent'
>exponent
</a></td>
<td>(
"e" |
"E") [
"+" |
"-"]
<a class='grammartoken'
href=
"identifiers.html#tok-digit">digit
</a>+
</td></tr>
<a class=
"grammar-footer"
href=
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>Download entire grammar as text.
</a>
Note that the integer and exponent parts of floating point numbers
can look like octal integers, but are interpreted using radix
10. For
example,
"<tt class="samp
">077e010</tt>" is legal, and denotes the same number
as
"<tt class="samp
">77e10</tt>".
The allowed range of floating point literals is
implementation-dependent.
Some examples of floating point literals:
<div class=
"verbatim"><pre>
3.14 10.
.001 1e100
3.14e-10 0e0
Note that numeric literals do not include a sign; a phrase like
<code>-
1</code> is actually an expression composed of the operator
<code>-
</code> and the literal
<code>1</code>.
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<span class=
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2.4.2, documentation updated on
28 September
2005.
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