Arguments

start-bit

   Specifies the offset of the first bit to be extracted. The
   low-order (rightmost) bit of a string is position number 0
   for determining the offset. Specify the offset as an integer
   expression.

   If you specify an expression with a negative value, or with a
   value that exceeds the number of bits in the string, then DCL
   displays the INVRANGE error message.


number-of-bits

   Specifies the length of the bit string to be extracted, which
   must be less than or equal to the number of bits in the string.

   If you specify an expression with a negative value, or with a
   value that is invalid when added to the bit position offset, then
   DCL displays the INVRANGE error message.


string

   Specifies the string from which the bits are taken. Specify the
   string as a character string expression.