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$OFMT

The output format for printed numbers. This variable is a half-hearted attempt to emulate awk's OFMT variable. There are times, however, when awk and Perl have differing notions of what is in fact numeric. The initial value is %.ng, where n is the value of the macro DBL_DIG from your system's float.h. This is different from awk's default OFMT setting of %.6g, so you need to set ``$#'' explicitly to get awk's value. (Mnemonic: # is the number sign.)

Use of ``$#'' is deprecated.

Source: Perl predefined variables
Copyright: Larry Wall, et al.

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$OFMT $#

$OFMT
$#