macro
<cfenv>

FE_DOWNWARD

int
Downward rounding direction mode
This macro expands to a value of type int that identifies the downward rounding direction mode for functions fegetround and fesetround.

Rounding x downward selects the largest possible value that is not greater than x.

Possible rounding direction modes are:
macro valuedescription
FE_DOWNWARDRound downward.
FE_TONEARESTRound to nearest.
FE_TOWARDZERORound toward zero.
FE_UPWARDRound upward.

See also

FE_TONEAREST
To-nearest rounding direction mode (macro )
FE_TOWARDZERO
Toward-zero rounding direction mode (macro )
FE_UPWARD
Upward rounding direction mode (macro )
fegetround
Get rounding direction mode (function )
fesetround
Set rounding direction mode (function )

C++