## 12.5.3 BLANK Specifier

The BLANK specifier asks what type of blank control is in effect for a file. It takes the following form:

  BLANK = blnk
  blnk
  Is a scalar default character variable that is assigned one of the following values:

  'NULL' | If null blank control is in effect for the file
  'ZERO' | If zero blank control is in effect for the file
  'UNDEFINED' | If the file is not connected, or it is not connected for formatted data transfer

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