INTERFACEBy default, the procedures in theFmtBufTest ;
FmtBuf interface for formatting real
numbers use the current rounding mode to round the result when fewer
digits of precision are requested than are provided automatically by
Float.ToDecimal. In order to test the implementation of the FmtBuf
interface, we would like to be able to exercise it under each rounding
mode. Unfortunately, not all rounding modes are necessarily supported by
each architecture. In particular, the FloatMode.SetRounding procedure
may raise the exception FloatMode.Failure if the requested rounding
mode is not supported by the underlying architecture.
This interface provides a mechanism for test programs to override this default behavior and fix the current rounding mode, even if it is not supported by the underlying architecture.
IMPORT FloatMode; VAR useCurrentRounding := TRUE; testRoundingMode: FloatMode.RoundingMode;If
useCurrentRounding is TRUE, then the procedures in FmtBuf for
formatting real numbers use the current rounding mode. In this case, the
value of the global variable testRoundingMode is ignored.
If useCurrentRounding is FALSE, then these procedures use
testRoundingMode as the rounding mode, even if it is not a rounding
mode supported by the underlying architecture.
END FmtBufTest.