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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, 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.