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Function Details : atan2

doubleatan2(double y,double x) ;

Return Type : double

Double-precision floating point (±1.7E±308, ~15 decimal digits)
Read about return values of atan2 function .

1st Parameter Type : double

Double-precision floating point (±1.7E±308, ~15 decimal digits)

1st Parameter

The y-coordinate of a point in a 2D Cartesian coordinate system

2nd Parameter Type : double

Double-precision floating point (±1.7E±308, ~15 decimal digits)

2nd Parameter

The x-coordinate of a point in a 2D Cartesian coordinate system

Read more about parameters of atan2 in parameters section
The atan2function in C language Calculates the arc tangent of two variables representing the quotient.
The atan2 function computes the principal value of the arc tangent of y/x, using the signs of both arguments to determine the quadrant of the return value. It is similar to calculating the arc tangent of y/x, but it has a wider range of validity and is more robust. This function returns a value in the range [-π, π].
The atan2function takes 2 parameters:
  • •
    double `y`: The y-coordinate of a point in a 2D Cartesian coordinate system
  • •
    double `x`: The x-coordinate of a point in a 2D Cartesian coordinate system
Computes the arc tangent (inverse tangent) of the quotient `y / x`, returning the angle in radians in the range [-π, π]. The signs of both arguments are used to determine the quadrant of the result.
The atan2 function return value :
  • Returns the arc tangent of y/x, in radians, in the range [-π, π]

Output

This example demonstrates the basic usage of the `atan2` function with points in all four quadrants.