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# Arrays, Structures And Enums

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Arrays, Multidimentional Arrays, Jagged Arrays, Structures and Enums

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### Arrays, Structures And Enums

1. 1. Bhushan Mulmule bhushan.mulmule@dotnetvideotutorial.com www.dotnetvideotutorial.com
2. 2. For video visit www.dotnetvideotutorial.com
3. 3. Agenda  Single Dimensional Array  Array Class  Array of Reference Type  Double Dimensional Array  Jagged Array  Structure  Enum www.dotnetvideotutorial.com
4. 4. Array  Data structure holding multiple values of same data-type  Are reference type  Derived from abstract base class Array 20 50 60 0 1 2 Arrays are zero indexed Last index is always (size – 1) 5000 5000 marks www.dotnetvideotutorial.com
5. 5. Array Declarations // Declare a single-dimensional array int[] array1 = new int[5]; // Declare and set array element values, Size can be skipped int[] array2 = new int[] { 1, 3, 5, 7, 9 }; // Alternative syntax. new keyword can be skipped int[] array3 = { 1, 3, 5, 7, 9 }; // Declaration and instantiation on separate lines int[] array4; array4 = new int[5]; 5000 5000 array1 0 1 2 3 4 www.dotnetvideotutorial.com
6. 6. 0 0 0 int[] marks = new int[3]; Console.WriteLine("Enter marks in three subjects:"); for (int i = 0; i < 3; i++) marks[i] = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("Marks obtained:"); Console.WriteLine("Printed using for loop"); for (int i = 0; i < 3; i++) Console.WriteLine(marks[i]); Console.WriteLine("Printed using foreach loop"); foreach (int m in marks) { Console.WriteLine(m); } 20 50 60 5000 5000 marks The default value for elements of numeric array is zero 0 1 2 Single Dimensional Array www.dotnetvideotutorial.com
7. 7. Array Class  Base class for all arrays in the common language runtime.  Provides methods for creating, manipulating, searching, and sorting arrays www.dotnetvideotutorial.com
8. 8. Array Class int[] numbers = { 78, 54, 76, 23, 87 }; //sorting Array.Sort(numbers); Console.WriteLine("sorted array: "); for (int i = 0; i < numbers.Length; i++) Console.WriteLine(numbers[i]); //reversing Array.Reverse(numbers); ... //finding out index int index = Array.IndexOf(numbers, 54); Console.WriteLine("Index of 54: " + index); www.dotnetvideotutorial.com
9. 9. Array of Reference Types static void Main(string[] args) { string[] computers = { "Titan", "Mira", "K computer" }; Console.WriteLine("Fastest Super Computers: n"); foreach (string n in computers) { Console.WriteLine(n); } } 2000 2200 1800 Titan Mira K Computer 2000 1800 2200 5000 5000 Computers Note: Default value for elements of reference array is null
10. 10. int[,] marks = new int[3, 4]; for (int i = 0; i < 3; i++) { C.WL("Enter marks in 4 subjects of Student {0}", i + 1); for (int j = 0; j < 4; j++) { marks[i, j] = Convert.ToInt32(Console.ReadLine()); } } 0 0 0 0 0 0 0 0 0 0 0 0 40 50 60 70 80 90 70 80 30 50 80 70 0 1 2 0 1 2 3 2D Array www.dotnetvideotutorial.com
11. 11. Console.WriteLine("---------------Score Board------------------"); for (int i = 0; i < 3; i++) { Console.Write("Student {0}:tt", i + 1); for (int j = 0; j < 4; j++) { Console.Write(marks[i, j] + "t"); } Console.WriteLine(); } 0 0 0 0 0 0 0 0 0 0 0 0 40 50 60 70 80 90 70 80 30 50 80 70 0 1 2 0 1 2 3 2D Array www.dotnetvideotutorial.com
12. 12. Jagged Array  Array of Arrays: A jagged array is an array whose elements are arrays.  The elements of a jagged array can be of different dimensions and sizes.  Syntax: type[][] identifier = new type[size][]; www.dotnetvideotutorial.com
13. 13. Jagged Array int[][] a = new int[3][]; a[0] = new int[2] { 32, 54 }; a[1] = new int[4] { 78, 96, 46, 38 }; a[2] = new int[3] { 54, 76, 23 }; 2000 1800 2200 5000 5000 a 2000 2200 1800 32 54 54 76 23 78 96 46 38
14. 14. for (int i = 0; i < 3; i++) { for (int j = 0; j < a[i].Length; j++) { Console.Write(a[i][j] + "t"); } Console.WriteLine(); } 2000 1800 2200 5000 5000 a 2000 2200 1800 32 54 54 76 23 78 96 46 38
15. 15. Struct  Keyword to create user defined datatype  Typically used to encapsulate small groups of related variables  A struct type is a value type  Structs can implement an interface but can't inherit from another struct or class. NOTE: structs can contain constructors, constants, fields, methods, properties, indexers, operators, events, and nested types, although if several such members are required, consider making your type a class instead.
16. 16. struct Point { public int x; public int y; } class Program { static void Main(string[] args) { Point p1; Console.WriteLine("Enter X and Y axis of point:"); p1.x = Convert.ToInt32(Console.ReadLine()); p1.y = Convert.ToInt32(Console.ReadLine()); C.WL("Coordinates of p1: x = {0}, y = {1}", p1.x, p1.y); Console.ReadKey(); } } 0 0 p1 x y 10 20 www.dotnetvideotutorial.com
17. 17. Enum enum Gender { Male, Female, Other } Gender g1 = Gender.Female; 1 g1 www.dotnetvideotutorial.com
18. 18. Enums  The enum keyword is used to declare an enumeration, a distinct type consisting of a set of named constants called the enumerator list.  The default underlying type of the enumeration elements is int.  By default, the first enumerator has the value 0, and the value of each successive enumerator is increased by 1. www.dotnetvideotutorial.com
19. 19. enum Gender { Male = 10, Female, Other } class Program { static void Main(string[] args) { Gender g1 = Gender.Female; C.WL("g1 represents {0}. But value stored is {1}", g1, (int)g1); Gender g2 = Gender.Male; C.WL("g2 represents {0}. But value stored is {1}", g2, (int)g2); } } 11 10 g1 g2 www.dotnetvideotutorial.com
20. 20. Bhushan Mulmule bhushan.mulmule@dotnetvideotutorial.com www.dotnetvideotutorial.com
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