The ATAN2 Function in C programming is one of the Math Library Function, used to calculate the Trigonometric Arc Tangent of y/x. Or you can say, it is used to returns the angle in radius from the X -Axis to the specified point (y, x).

In this article we will show you, How to use this ATAN2 function in C with example.

**TIP : **Please refer TAN Function article to calculate the Tangent value, and ATAN Function to calculate the Arc Tangent Value of the specified expression.

## Syntax of ATAN2 Function in C

The basic syntax of the atan2 inĀ C Programming is as shown below.

double atan2(double y, double x);

## ATAN2 Function in C Example

The atan2 Function in math library helps you to find the trigonometric Arc Tangent of multiple parameters.

This atan2 program, ask the user for two values, and then find the arc tangent value of those two parameters

/* Example for ATAN2 Function in C Programming */ #include <stdio.h> #include <math.h> int main() { double atan2Value, X, Y; printf("\n Please Enter the Values for Y and X to calculate Arc Tangent of Y/X : \n "); scanf("%lf %lf", &Y, &X); atan2Value = atan2(Y, X); printf("\n The Arc Tangent value of %lf and %lf = %f ", Y, X, atan2Value); return 0; }

**OUTPUT**

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