C Math atan() Function
Example
Return the arctangent of different numbers:
printf("%f", atan(0.5));
printf("%f", atan(-0.5));
printf("%f", atan(5));
printf("%f", atan(-5.0));
printf("%f", atan(100.0));
printf("%f", atan(-100.0));
Try it Yourself »
Definition and Usage
The atan()
function returns the arctangent of a number in radians.
The atan()
function is defined in the <math.h>
header file.
Tip: The atan() function only returns angles between -PI/2 and PI/2. The atan2() function can return any angle.
Syntax
One of the following:
atan(double number);
Parameter Values
Parameter | Description |
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number | Required. Specifies a number. |
Technical Details
Returns: | A double value representing the arctangent of a number. |
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