using System;
using System.Data;


class Class1{
        static void Main(string[] args){
            Console.WriteLine(ConvertDegreesToRadians (180));

            Console.WriteLine(ConvertDegreesToRadians (90));

            Console.WriteLine(ConvertDegreesToRadians (30));

        }
    public static double ConvertDegreesToRadians (double degrees)
    {
      double radians = (Math.PI / 180) * degrees;
      return (radians);
    }  
}

           
         
     

   
 
//http://arolibraries.codeplex.com/
//The MIT License (MIT)


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

namespace AroLibraries.ExtensionMethods
{
    public static class NullableExt
    {

        public static bool Ext_HasValueAndEquals<T>(this Nullable<T> source, T target) where T : struct
        {
            return source.HasValue &amp;&amp; source.Value.Equals(target);
        }

        public static bool Ext_HasValueAndEquals<T>(this Nullable<T> source, Nullable<T> target) where T : struct
        {
            return source.HasValue &amp;&amp; source.Value.Equals(target);
        }

    }
}

   
     

   
 

//Microsoft Public License (Ms-PL)
//http://visualizer.codeplex.com/license

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

namespace Redwerb.BizArk.Core.TypeExt
{
    /// <summary>
    /// Provides extension methods for Type.
    /// </summary>
    public static class TypeExt
    {


        public static bool IsNullable(this Type type)
        {
            if (type == null) return false;
            if (!type.IsGenericType) return false;
            if (type.GetGenericTypeDefinition() != typeof(Nullable<>)) return false;
            return true;
        }
   }
}

   
     

   
  



using System;
using System.Collections.Generic;
using System.Text;


public class MyTest {
    public static void NullableTest(Nullable<int> intVal1, int intVal2) {
        if (intVal1.HasValue == true)
            Console.WriteLine(intVal1);
        else
            Console.WriteLine("Value1 is NULL");

        if (intVal2 > 0)
            Console.WriteLine(intVal2);
        else
            Console.WriteLine("Value2 is Null?");
    }
}
 
         
     

   
  
using System;
using System.Collections.Generic;
using System.Text;

class DatabaseReader {
    // Nullable data field.
    public int? numbericValue;
    public bool? boolValue = true;

    // Note the nullable return type. 
    public int? GetIntFromDatabase() { return numbericValue; }

    // Note the nullable return type. 
    public bool? GetBoolFromDatabase() { return boolValue; }
}

class Program {
    static void Main(string[] args) {
        DatabaseReader dr = new DatabaseReader();

        int? i = dr.GetIntFromDatabase();
        if (i.HasValue)
            Console.WriteLine("Value of 'i' is: {0}", i);
        else
            Console.WriteLine("Value of 'i' is undefined.");

        // Get bool from 'database'.
        bool? b = dr.GetBoolFromDatabase();
        if (b != null)
            Console.WriteLine("Value of 'b' is: {0}", b);
        else
            Console.WriteLine("Value of 'b' is undefined.");

        // If the value from GetIntFromDatabase() is null, 
        // assign local variable to 100.
        int? myData = dr.GetIntFromDatabase() ?? 100;
        Console.WriteLine("Value of myData: {0}", myData);
    }
}

   
     

   
  
using System;
using System.Collections.Generic;
using System.Text;

class DatabaseReader {
    // Nullable data field.
    public int? numbericValue;
    public bool? boolValue = true;

    // Note the nullable return type. 
    public int? GetIntFromDatabase() { return numbericValue; }

    // Note the nullable return type. 
    public bool? GetBoolFromDatabase() { return boolValue; }
}

class Program {
    static void Main(string[] args) {
        DatabaseReader dr = new DatabaseReader();

        int? i = dr.GetIntFromDatabase();
        if (i.HasValue)
            Console.WriteLine("Value of 'i' is: {0}", i);
        else
            Console.WriteLine("Value of 'i' is undefined.");
        // Get bool from 'database'.
        bool? b = dr.GetBoolFromDatabase();
        if (b != null)
            Console.WriteLine("Value of 'b' is: {0}", b);
        else
            Console.WriteLine("Value of 'b' is undefined.");
        // If the value from GetIntFromDatabase() is null, 
        // assign local variable to 100.
        int? myData = dr.GetIntFromDatabase() ?? 100;
        Console.WriteLine("Value of myData: {0}", myData);
    }
}

   
     

using System;
using System.Collections.Generic;
using System.Text;

public class Vector {
public double? R = null;
public double? Theta = null;

public double? ThetaRadians {
get {
return (Theta * Math.PI / 180.0);
}
}

public Vector(double? r, double? theta) {
if (r < 0) { r = -r; theta += 180; } theta = theta % 360; R = r; Theta = theta; } public static Vector operator +(Vector op1, Vector op2) { try { double newX = op1.R.Value * Math.Sin(op1.ThetaRadians.Value) + op2.R.Value * Math.Sin(op2.ThetaRadians.Value); double newY = op1.R.Value * Math.Cos(op1.ThetaRadians.Value) + op2.R.Value * Math.Cos(op2.ThetaRadians.Value); double newR = Math.Sqrt(newX * newX + newY * newY); double newTheta = Math.Atan2(newX, newY) * 180.0 / Math.PI; return new Vector(newR, newTheta); } catch { return new Vector(null, null); } } public static Vector operator -(Vector op1) { return new Vector(-op1.R, op1.Theta); } public static Vector operator -(Vector op1, Vector op2) { return op1 + (-op2); } public override string ToString() { string rString = R.HasValue ? R.ToString() : "null"; string thetaString = Theta.HasValue ? Theta.ToString() : "null"; return string.Format("({0}, {1})", rString, thetaString); } } class Program { public static void Main(string[] args) { Vector v1 = GetVector("vector1"); Vector v2 = GetVector("vector1"); Console.WriteLine("{0} + {1} = {2}", v1, v2, v1 + v2); Console.WriteLine("{0} - {1} = {2}", v1, v2, v1 - v2); Console.ReadKey(); } public static Vector GetVector(string name) { Console.WriteLine("Input {0} magnitude:", name); double? r = GetNullableDouble(); Console.WriteLine("Input {0} angle (in degrees):", name); double? theta = GetNullableDouble(); return new Vector(r, theta); } public static double? GetNullableDouble() { double? result; string userInput = Console.ReadLine(); try { result = double.Parse(userInput); } catch { result = null; } return result; } } [/csharp]