CC78K4 Datasheet, PDF (239/523 Pages) NEC – CC78K4 Ver.2.30 or Later, C Compiler Language

CHAPTER 10 LIBRARY FUNCTIONS
7-7 tan
Mathematical Functions
FUNCTION
tan finds tan.
HEADER
math.h
FUNCTION PROTOTYPE
double tan (double x);
Function
tan
Arguments
x ... Numeric value to perform
operation
Return Value
Normal ... tan of x
When x = NaN, x = ±∞ ... NaN
When underflow occurs ...
Non-normalized number
EXPLANATION
• Calculates tan of x.
• If x is non-numeric, NaN is returned.
• If x is infinite, NaN is returned and EDOM is set to errno.
• If an underflow occurs as a result of the operation, a non-normalized number is returned.
• If the absolute value of x is extremely large, the result of an operation becomes an almost meaningless value.
User’s Manual U15556EJ1V0UM
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