cobol2.hlp (Table of Contents; Topic list)
TRUNC Details (↑ Choosing Run-time Behavior)
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     The possible values of this directive are:
 
      TRUNC         Truncate in decimal to the number of digits given by
                    the PICTURE clause, on all stores into COMP items.
 
      NOTRUNC       Truncate in binary to the capacity of the allocated
                    storage, on all stores into COMP items.
 
      TRUNC "ANSI"  Truncate in decimal to the number of digits given by
                    the PICTURE clause, on non-arithmetic stores into COMP
                    items. On arithmetic statements that cause the size
                    error condition and that have no ON SIZE ERROR
                    phrase, the result is undefined.
                                    -♦-