C Language: atan function
(Arc Tangent)
In the C Programming Language, the atan function returns the arc tangent of x.
Syntax
The syntax for the atan function in the C Language is:
double atan(double x);
Parameters or Arguments
- x
- The value used to calculate the arc tangent.
Returns
The atan function returns the arc tangent of a number represented by x. It will return a value between -π/2 and π/2.
Required Header
In the C Language, the required header for the atan function is:
#include <math.h>
Applies To
In the C Language, the atan function can be used in the following versions:
- ANSI/ISO 9899-1990
atan Example
/* Example using atan by TechOnTheNet.com */
#include <stdio.h>
#include <math.h>
int main(int argc, const char * argv[])
{
/* Define temporary variables */
double value;
double result;
/* Assign the value we will find the atan of */
value = 0.5;
/* Calculate the Arc Tangent of value */
result = atan(value);
/* Display the result of the calculation */
printf("The Arc Tangent of %f is %f\n", value, result);
return 0;
}
When compiled and run, this application will output:
The Arc Tangent of 0.500000 is 0.463648
Similar Functions
Other C functions that are similar to the atan function:
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