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# Arrays C#

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### Transcript of "Arrays C#"

1. 1. ArraysSimple ArraysMultidimensional ArraysJagged ArraysThe Array classyield Statement
2. 2. Simple Arrays An array is a data structure that contains a number of elements of the same type. Array Declaration  Syntax:  datatype[] myArray; Array Initialization  Syntax:  datatype[] myArray=new datatype[size];// size is a integer value
3. 3. Simple Arrays With this declaration and initialization, the variable myArray references four integer values that are allocated on the managed heap.
4. 4. Multidimensional Arrays One dimensional arrays are indexed by a single integer, A multidimensional array is indexed by two or more integers. Syntax:  datatype[,] twodim=new datatype[size1,size2]; Ex:  int [,] twodim={{1,2,3},{4,5,6},{7,8,9}};
5. 5. Jagged Arrays A two-dimensional array has a rectangular size(Ex: 3X3). A jagged array is more flexible in sizing the array, With jagged array every row can have different Size.
6. 6. Jagged Arrays A jagged array is an array whose elements are arrays. The elements of a jagged array can be of different dimensions and sizes. A jagged array is sometimes called an "array of arrays." Syntax:  datatype[][] jagged =new datatype[size][];  Jagged[0]=new datatype[2]{//values};  Jagged[1]=new datatype[6]{//values};  Jagged[2]=new datatype[4]{//values};  ..
7. 7. The Array Class Array Class provides methods for creating, manipulating, searching, and sorting arrays, thereby serving as the base class for all arrays in the common language runtime. Declaring an array with brackets is C# notation using Array Class. Creating Array using Array class  Array arr1=Array.CreateInstance(typeof(datatype),size); Copying Arrays  The Clone() method that is defined with ICloneable creates a shallow copy of the array.  Array class implements the interface ICloneable.  Ex:  int[] arr1={1,2};  int [] arr2=(int[])arr1.Clone();
8. 8. IEnumerator<T> Interface Supports a simple iteration over a generic collection.  Syntax:  public interface IEnumerator<out T> : IDisposable, IEnumerator  out T  The type of objects to enumerate.  This type parameter is covariant. That is, you can use either the type you specified or any type that is more derived. Properties  Current  Gets the element in the collection at the current position of the enumerator. Methods  Dispose Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.  MoveNext Advances the enumerator to the next element of the collection.  Reset Sets the enumerator to its initial position, which is before the first element in the collection.
9. 9. foreach Statement The foreach statement repeats a group of embedded statements for each element in an array or an object collection that implements the System.Collections.IEnumerable or System.Collections.Generic.IEnumerable<T> interface. int[] array1 = new int[] { 0, 1, 2, 3, 5, 8, 13 }; foreach (int i in array1) { System.Console.WriteLine(i); }
10. 10. yield Statement C# 2.0 added the yield statement for creating enumerations easily. Used in an iterator block to provide a value to the enumerator object or to signal the end of iteration. It takes one of the following forms: yield return <expression>; yield break; yield return statement returns one element of a collection and moves the position to the next element, and yield break stops the iteration.
11. 11. TUPLES
12. 12. Tuples The release of .NET Framework 4.0 adds Tuples to the base class library. Tuples have the origin in functional programming languages like F#. .NET 4 defines eight Tuple classes and one static Tuple class that act as a factory of tuples.
13. 13. Creating a Tuple Example 1: public static Tuple<int,int> Divide(int divd, int divs) {int res=divd/divs; int rem=divd%divs; return Tuple.Create<int, int>(res, rem); } var res=Divide(5,2); Console.Write(res.Item1+”t”+res.Item2);  Example 2: var tuple=Tuple.Create<string, string, string, int, int, int>( “Hello”, ”Welcome To”, ”KMIT”,1,5,78); You can have Tuple type itself as parameter.  Ex: var tuple=Tuple.Create<string, string, string, int, int, int,Tuple<int,int>> (“Hello”, ”Welcome To”, ”KMIT”,1,5,78,Tuple.Create<int, int>(52,59));
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