C Math acos() Function
Example
Return the arccosine of different numbers:
printf("%f", acos(0.64));
printf("%f", acos(-0.4));
printf("%f", acos(0));
Definition and Usage
The acos() function returns the arccosine of a number in radians.
The acos() function is defined in the <math.h> header file.
Syntax
One of the following:
acos(double number);Parameter Values
| Parameter | Description |
|---|---|
| number | Required. A number to find the arccosine of, in the range -1 to 1. If the value is outside -1 to 1, it returns NaN (Not a Number). |
Technical Details
| Returns: |
A double value representing the arccosine of a number in radians.
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