C acos() Function

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C acos() Function

The acos() function returns the arc-cosine of the given number.

This function is defined in <math.h> header file.


C Compiler
#include <stdio.h> #include <math.h> int main() { printf("%lf", acos(0.5)); return 0; }




acos(data_type x)

Parameter Values

xRequiredSpecifies a floating point value in the interval [-1, +1].

Return Value

NumberThe arc-cosine of the given number.
The return value will be between 0 and π, if the given value is between -1 and 1.
The return value is represented in radians.
NaNIf the given value is not between -1 and 1.


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