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| @node Double precision, Floating Point, Mixed precision, Arithmetic |
@node Double precision, Floating Point, Mixed precision, Arithmetic |
| @subsection Double precision |
@subsection Double precision |
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The outer (aka text) interpreter converts numbers containing a dot into |
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a double precision number. Note that only numbers with the dot as last |
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character are standard-conforming. |
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| doc-d+ |
doc-d+ |
| doc-d- |
doc-d- |
| doc-dnegate |
doc-dnegate |
| @node Floating Point, , Double precision, Arithmetic |
@node Floating Point, , Double precision, Arithmetic |
| @subsection Floating Point |
@subsection Floating Point |
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The format of floating point numbers recognized by the outer (aka text) |
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interpreter is: a signed decimal number, possibly containing a decimal |
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point (@code{.}), followed by @code{E} or @code{e}, optionally followed |
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by a signed integer (the exponent). E.g., @code{1e} ist the same as |
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@code{+1.0e+1}. Note that a number without @code{e} |
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is not interpreted as floating-point number, but as double (if the |
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number contains a @code{.}) or single precision integer. Also, |
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conversions between string and floating point numbers always use base |
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10, irrespective of the value of @code{BASE}. If @code{BASE} contains a |
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value greater then 14, the @code{E} may be interpreted as digit and the |
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number will be interpreted as integer, unless it has a signed exponent |
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(both @code{+} and @code{-} are allowed as signs). |
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| Angles in floating point operations are given in radians (a full circle |
Angles in floating point operations are given in radians (a full circle |
| has 2 pi radians). Note, that gforth has a separate floating point |
has 2 pi radians). Note, that gforth has a separate floating point |
| stack, but we use the unified notation. |
stack, but we use the unified notation. |
