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.
Example
C Compiler
#include <stdio.h>
#include <math.h>
int main()
{
printf("%lf", acos(0.5));
return 0;
}
Output
1.047198
Syntax
acos(data_type x)
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| x | Required | Specifies a floating point value in the interval [-1, +1]. |
Return Value
| Value | Explanation |
|---|---|
| Number | The 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. |
| NaN | If the given value is not between -1 and 1. |
Reminder
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