Calculation of degrees is inaccurate

Question

I'm using the following code to convert radians to degrees and do some arithmetic on the same.

private double getDegrees(double rad)
{
    double deg = rad * Mathf.Rad2Deg;

     double degree = (-135 - deg) % 360;

     return degree;
}

The value calculates is inaccurate. I'm using the same code in Python and the result is quite accurate as follows,

def getDegree(rad):
    return (-135 - math.degrees(rad)) % 360

How do I get the accurate degrees with c#?

Input: -2.54 Output: 10.750966993188058
Input 2.57   Output 77.6960764459401
Input -0.62  Output 260.9199271359733
Input 0.52   Output 195.1409838350769

Note: The output is after (-135 - deg) % 360;

The output from c# is as follows,

Input -2.54  Output 11.0295281217168
Input 2.56   Output -282.127098553015
Input -0.63  Output -98.8646242270579
Input 0.51   Output -164.592296943409

Answer 1

Since the % operator will return negative values in C# when the input is negative, you'll have to convert them back to positive by adding 360:

private double getDegrees(double rad)
{
     double deg = rad * Mathf.Rad2Deg;

     double degree = (-135 - deg) % 360;

     return degree < 0 ? degree + 360 : degree;
}

Try it online