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 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 C 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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