public void ChangeRefType(RefClass r)
{
r.Change(r);
}
public void Change(RefClass r)
{
r.AutoImplementedProperty = 100;
}
static void Main(string[] args)
{
// DataAnnotation
ProductID = 5001;
// Error 2 'CSharpStuff.TestClass' does not contain a constructor that takes 0 arguments C:\Users\scott\Documents\Visual Studio 2013\Projects\InterviewProblems\CSharpStuff\Program.cs 12 35 CSharpStuff
// when overiding the default ctor a default ctor IS NOT created.
// TestClass testClass = new TestClass();
TestClass testClass = new TestClass(1);
RefClass refClass = new RefClass();
RefClass test;
string foo = "bar";
List <string> strings = new List <string> ()
{
"x", "y"
};
// var what is a var?
// Beginning in Visual C# 3.0, variables that are declared at method scope can have an implicit type var.
// An implicitly typed local variable is strongly typed just as if you had declared the type yourself,
// but the compiler determines the type.
//
var result = from str in strings
select str;
var result1 = from str1 in strings
where str1 == "x"
select str1;
// A lambda expression is an anonymous function that you can use to create
// delegates or expression tree types. By using lambda expressions, you can
// write local functions that can be passed as arguments or returned as
// the value of function calls. Lambda expressions are particularly helpful for
// writing LINQ query expressions.
LambdaDelegate myDelegate = x => x * x;
int j = myDelegate(5); //j = 25
// Lambdas operators are used in method-based LINQ queries as arguments to standard
// query operator methods such as Where.
var result2 = strings.Where(str2 => str2 == "y");
char [] ch = foo.ToCharArray();
ch[0] = 'a';
foo = new string(ch);
test = refClass; // Test is now a reference to the reference type RefClass refClass;
//
// All reference values were changed in ChangeRefType
//
testClass.ChangeRefType(refClass);
//
// string is a reference type, but does not behave like a reference type!
// The string paramater is not changed!
//
testClass.ChangeRefType(foo);
//
// This will change the string!
//
testClass.ChangeRefType(ref foo);
//
// Will throw exception System.OverflowException if the sum of a+b
// exceeds Maximum integer value = 2147483647
//
int a = 100, b = 200;
int c;
try
{
c = checked (a + b);
}
catch (System.OverflowException e)
{
Console.WriteLine(e.Message);
}
ThreadSafeSingleton singleton = ThreadSafeSingleton.Singleton;
ThreadSafeSingleton singleton2 = ThreadSafeSingleton.Singleton;
Reverser reverser = new Reverser();
int reversedInt = reverser.Reverse(321);
string reversedString = reverser.Reverse("foobars");
// lLass is a reference object, equal operator sets a REFERENCE to the object.
// STruct is a value object, equal operator creates a new shallow copy.
ChessBoard chessBoard = new ChessBoard();
chessBoard.PlayerName = "Bill";
// chessboard1 is now a reference to chessboard.
ChessBoard chessBoard1 = chessBoard;
// both chessboard and chessboard1 have the name "Jo" now.
chessBoard1.PlayerName = "Jo";
TestStruct testA = new TestStruct();
testA.Name = "foo";
TestStruct testB;
// TestB is a shallow copy of TestA
testB = testA;
// TestB has the name "bar", TestB still has the name "foo".
testB.Name = "bar";
int[] arr = new int[] { 2 };
int distance = BST.FindEdges(arr, 2, 2);
//Debug.Assert(distance == 0, "distance should = 0");
//arr = new int [] { };
//distance = BST.FindEdges(arr, 2, 2);
//Debug.Assert(distance == -1, "distance should = -1");
//arr = new int[] { 2, 5, 1, 6 };
//distance = BST.FindEdges(arr, 2, 7);
//Debug.Assert(distance == -1, "distance should = -1");
//arr = new int[] { 2, 5, 1, 6 };
//distance = BST.FindEdges(arr, 1, 6);
//Debug.Assert(distance == 2, "distance should = 2");
arr = new int[] { 7, 2, 5, 1, 6 };
distance = BST.FindEdges(arr, 1, 6);
// Debug.Assert(distance == 2, "distance should = 2");
// Expected output "eth quick nworb..."
string reverseEveryOther = "The quick brown fox jumped over the lazy dog";
string everyOtherReversed = reverser.ReverseEveryOtherWord(reverseEveryOther);
Console.WriteLine(everyOtherReversed);
}
public void ChangeRefType(RefClass r)
{
r.Change(r);
}
public void Change(RefClass r)
{
r.AutoImplementedProperty = 100;
}
static void Main(string[] args)
{
// Error 2 'CSharpStuff.TestClass' does not contain a constructor that takes 0 arguments C:\Users\scott\Documents\Visual Studio 2013\Projects\InterviewProblems\CSharpStuff\Program.cs 12 35 CSharpStuff
// when overiding the default ctor a default ctor IS NOT created.
// TestClass testClass = new TestClass();
TestClass testClass = new TestClass(1);
RefClass refClass = new RefClass();
RefClass test;
string foo = "bar";
List<string> strings = new List<string> () {"x","y"};
// var what is a var?
// Beginning in Visual C# 3.0, variables that are declared at method scope can have an implicit type var.
// An implicitly typed local variable is strongly typed just as if you had declared the type yourself,
// but the compiler determines the type.
//
var result = from str in strings
select str;
var result1 = from str1 in strings
where str1 == "x"
select str1;
// A lambda expression is an anonymous function that you can use to create
// delegates or expression tree types. By using lambda expressions, you can
// write local functions that can be passed as arguments or returned as
// the value of function calls. Lambda expressions are particularly helpful for
// writing LINQ query expressions.
LambdaDelegate myDelegate = x => x * x;
int j = myDelegate(5); //j = 25
// Lambdas operators are used in method-based LINQ queries as arguments to standard
// query operator methods such as Where.
var result2 = strings.Where(str2 => str2 == "y");
char [] ch = foo.ToCharArray();
ch[0] = 'a';
foo = new string(ch);
test = refClass; // Test is now a reference to the reference type RefClass refClass;
//
// All reference values were changed in ChangeRefType
//
testClass.ChangeRefType(refClass);
//
// string is a reference type, but does not behave like a reference type!
// The string paramater is not changed!
//
testClass.ChangeRefType(foo);
//
// This will change the string!
//
testClass.ChangeRefType(ref foo);
//
// Will throw exception System.OverflowException if the sum of a+b
// exceeds Maximum integer value = 2147483647
//
int a = 100, b = 200;
int c;
try
{
c = checked(a + b);
}
catch (System.OverflowException e)
{
Console.WriteLine(e.Message);
}
}
