C Language: atan function(Arc Tangent)

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C Programming allows us to perform mathematical operations through the functions defined in header file. The header file contains various methods for performing mathematical operations such as sqrt(), pow(), ceil(), floor() etc.

C Math Functions

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

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 c programming */

#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




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