CC78K4 Datasheet, PDF (256/523 Pages) NEC – CC78K4 Ver.2.30 or Later, C Compiler Language

CHAPTER 10 LIBRARY FUNCTIONS
7-24 acosf
Mathematical Functions
FUNCTION
acosf finds acos.
HEADER
math.h
FUNCTION PROTOTYPE
float acosf (float x);
Function
acosf
Arguments
x ... Numeric value to perform
operation
Return Value
When –1 ≤ x ≤ 1 ... acos of x
When x ≤ –1, 1 < x, x = ...
NaN
EXPLANATION
• Calculates acos (range between 0 and π) of x
• If x is non-numeric, NaN is returned.
• In the case of a definition area error of x ≤ –1, 1 ≤ x, NaN is returned and EDOM is set to errno.
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User’s Manual U15556EJ1V0UM