CURRENT DECFLOAT ROUNDING MODE

The data type of the register is VARCHAR(128). The rounding modes supported are:

ROUND_CEILING

Round toward +infinity. If all of the discarded digits are zero or if the sign is negative, the result is unchanged other than the removal of the discarded digits. Otherwise, the result coefficient is incremented by one (rounded up).

ROUND_DOWN

Round toward zero (truncation). The discarded digits are ignored.

ROUND_FLOOR

Round toward -infinity. If all of the discarded digits are zero or if the sign is positive, the result is unchanged other than the removal of the discarded digits. Otherwise, the sign is negative and the result coefficient is incremented by one.

ROUND_HALF_DOWN

Round to nearest; if equidistant, round down. If the discarded digits represent greater than half (0.5) of the value of a one in the next left position, then the result coefficient is incremented by one (rounded up). Otherwise, the discarded digits are ignored.

ROUND_HALF_EVEN

Round to nearest; if equidistant, round so that the final digit is even. If the discarded digits represent greater than half (0.5) of the value of a one in the next left position, then the result coefficient is incremented by one (rounded up). If they represent less than half, then the result coefficient is not adjusted (that is, the discarded digits are ignored). Otherwise (they represent exactly half), the result coefficient is unaltered if its rightmost digit is even, or incremented by one (rounded up) if its rightmost digit is odd (to make an even digit).

ROUND_HALF_UP

Round to nearest; if equidistant, round up. If the discarded digits represent greater than or equal to half (0.5) of the value of a one in the next left position, then the result coefficient is incremented by one (rounded up). Otherwise, the discarded digits are ignored.

ROUND_UP

Round away from zero. If all of the discarded digits are zero, the result is unchanged other than the removal of discarded digits. Otherwise, the result coefficient is incremented by one (rounded up).

The initial value of CURRENT DECFLOAT ROUNDING MODE in an activation group is established by the first SQL statement that is executed in the activation group.

• If the first SQL statement in an activation group is executed from an SQL program or SQL package, the CURRENT DECFLOAT ROUNDING MODE special register is set to the value of the DECFLTRND parameter.
• Otherwise, the initial value is ROUND_HALF_EVEN.

The DECFLTRND parameter on the CRTSQLxxx command or SET OPTION is used for static SQL statements.

   SELECT CURRENT DECFLOAT ROUNDING MODE
     INTO :APPL_ROUND
     FROM SYSIBM.SYSDUMMY1