CC78K4 Datasheet, PDF (235/523 Pages) NEC – CC78K4 Ver.2.30 or Later, C Compiler Language

CHAPTER 10 LIBRARY FUNCTIONS
7-3 atan
Mathematical Functions
FUNCTION
atan finds atan.
HEADER
math.h
FUNCTION PROTOTYPE
double atan (double x);
Function
atan
Arguments
x ... numeric value to perform
operation
Return Value
Normal ... atan of x
When x = NaN ... NaN
When x = –0 ... –0
EXPLANATION
• Calculates atan (range between –π/2 and +π/2) of x.
• When x is non-numeric, NaN is returned.
• When x is –0, –0 is returned.
• If an underflow occurs as a result of conversion, a non-normalized number is returned.
User’s Manual U15556EJ1V0UM
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