rzError, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        // Make rotation r -180 <= r <= 180
        static double Normalize(double degrees)
        {
            while (degrees > 180)
                degrees -= 360;
            while (degrees < -180)
                degrees += 360;
            
            return degrees;
        }
        
        static void TestRzError(double target, double current, double expected)
        {               
            double rzError = Normalize(((current%360) - (target%360)) % 360);
            
            const double tol = 1e-6;
            if (Math.Abs(rzError - expected) > tol)
                Console.WriteLine("{0} {1} error is {2} but expected {3}", 
                    target, current, rzError, expected);
        }
        
        public static void Main(string[] args)
        {
            TestRzError(180, 0, -180); // Expect -180
            TestRzError(0, 180, 180); // Expect 180
            
            TestRzError(90, 0, -90); // Expect -90
            TestRzError(0, 90, 90); // Expect 90
            
            TestRzError(180, -180, 0); // Expect 0
            TestRzError(-180, 180, 0); // Expect 0
            
            TestRzError(180, 0.01, -179.99); // Expect -179.99
            TestRzError(0.01, 180, 179.99); // Expect 179.99
            
            TestRzError(180, -179.99, .01); // Expect .01
            TestRzError(180, 179.99, -.01); // Expect -.01
            
            TestRzError(-180, -179.99, .01); // Expect .01
            TestRzError(-180, 179.99, -.01); // Expect -.01
            
            TestRzError(180.01, -179.99, 0); // Expect 0
            TestRzError(-179.99, 180.01, 0); // Expect 0
         
            TestRzError(179.99, -179.99, .02); // Expect 0.02
            TestRzError(-179.99, 179.99, -.02); // Expect -0.02
            
            TestRzError(180, 89.995, -90.005); // Expect -90.005
            
            TestRzError(-5, -4, 1); // Expect 1
            TestRzError(-4, -5, -1); // Expect -1
    
            // Don't try this at home!
            TestRzError(180, -1800, -180); // Expect -180
            TestRzError(-1800, 180, 180); // Expect 180
        }
    }
}

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Compilation time: 0,12 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 3