Interprets EXPR as an octal string and returns the corresponding
value. (If EXPR happens to start off with
, interprets it as a
hex string. If EXPR starts off with
0b, it is interpreted as a
binary string. Leading whitespace is ignored in all three cases.)
The following will handle decimal, binary, octal, and hex in standard
- $val = oct($val) if $val =~ /^0/;
The oct function is commonly used when a string such as
to be converted into a file mode, for example. Although Perl
automatically converts strings into numbers as needed, this automatic
conversion assumes base 10.
Leading white space is ignored without warning, as too are any trailing non-digits, such as a decimal point (oct only handles non-negative integers, not negative integers or floating point).