Inside Macintosh: PowerPC Numerics / Part 2 - The PowerPC Numerics C Implementation

Chapter 8 - Environmental Control Functions

Controlling the Rounding Direction

In MathLib, the following functions control the rounding direction:

fegetround	Returns the current rounding direction.
fesetround	Sets the rounding direction.

The four rounding direction modes are defined as the constants shown in Table 8-1.

Table 8-1 Rounding direction modes in MathLib

Rounding direction	Constant
To nearest	FE_TONEAREST
Toward zero	FE_TOWARDZERO
Upward	FE_UPWARD
Downward	FE_DOWNWARD