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Literals/Integer: Difference between revisions
Forth, BASE and prefixes
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=={{header|Forth}}==
The standard method for entering numbers of a particular base is to set the user variable BASE to the desired radix from 2 to 36. There are also convenience words for setting the base to DECIMAL and HEX.
<lang forth>
HEX
FEEDFACE
2 BASE !
1011001
DECIMAL
1234
: mask var @ [ base @ hex ] 3fff and [ base ! ] var ! ;
</lang>
The Forth numeric parser will look for symbols embedded within the stream of digits to determine whether to interpret it as a single cell, double cell, or floating point literal ('e').
<lang forth>
1234 ( n )
123.4 ( l h )
123e4 ( F: n )
</lang>
===Base prefixes===
{{works with|GNU Forth}}
In addition, many Forths have extensions for using a prefix to temporarily override BASE when entering an integer literal. These are the prefixes supported by GNU Forth.
<lang forth>
$feedface \ hexadecimal
&1234 \ decimal
%1001101 \ binary
'a \ base 256 (ASCII literal)
</lang>
Some Forths also support "0xABCD" hex literals for compatibility with C-like languages.
=={{header|Fortran}}==
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