C Sharp Variable Declaration Tutorial Videos for Beginner

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C Declaring Variables Tutorial Videos for
Beginners by
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Highlights

• Declaring variables
• Using built-in data types
• Working with characters
• Working with strings
• Building strings with String Builder
• Parsing strings as numbers

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Declaring variables

• variable is a name given to a storage area that
  our programs can manipulate.
• Integral types, Floating point types, Decimal
  types, Boolean types, Nullable types are basic
  value types in C.
• Syntax for variable definition ltdata_typegt
  ltvariable_listgt
• EX int i, j, k char c, ch float f, salary
  double d
• Syntax for Initializing Variables ltdata_typegt
  ltvariable_namegt value
• Ex int i 200

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Using built-in data types

• Byte, sbyte, short, ushort, int, uint, long,
  ulong, float, double, decimal, char, string
• bool, object are C built-in data types.
• Built-in data types are used within a C program
  in several ways like as variables,
   constants, return values and parameters
• Syntax int answer 42 const int speedLimit
  55 long CalculateSum(int a, int b) long result
  a b return result
• variables in C categorized into three types,
  they are value types, reference types pointer
  types

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Using built-in data types

• Reference types do not include the data stored in
  a variable, but they contain a reference to the
  variables. Object, dynamic, and string
  are reference types.
• Object Type is the ultimate base class for all
  data types, dynamic types store any type of value
  in the dynamic data type variable, String
  Type allows you to assign any string values to a
  variable.
• Pointer type variables store the memory address
  of another type. 
• Syntax type identifier

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Working with characters

• Char keyword is used to declare an example of
  the System.Char
• Char is a value type represents a character.
• Char must be used when converting to an integer.
• Char  type can be implicitly converted
  to ushort, int, uint, long, ulong, float, double,
  or decimal types.
  
• Value of a char object is a 16-bit numeric value.
•  System.Char type provides numerous static
  methods for working with char values.

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Working with strings

• String is basically a sequence of characters,
  used to declare a string variables.
• String keyword belongs to the System.String
  class. Many methods been provided in C to create
  string objects.
• String objects can be created by assigning a
  string literal to a String variable, using a
  String class constructor, by string concatenation
  operator.
• Char , length are the properties and compare,
  concat, copy, equals, index, join, remove,
  replace, split are various methods of string.

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Building strings with String Builder

• System.Text.StringBuilder class can be used to
  create strings without creating a new object.
  Syntax for creating strings is as follows
• StringBuilder MyStringBuilder new
  StringBuilder("Hello World!")
• StringBuilder class can boost performance when
  concatenating many strings together in a loop.
• Unlike a string, a StringBuilder can be changed.
  Using StringBuilder  a string can be appended
  many times.

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Parsing strings as numbers

• TryParse method or Convert class methods are used
  convert a string to a number.
• Ex int numVal Int32.Parse(253")
• Console.WriteLine(numVal)
• Output 253
• int j
• if (Int32.TryParse(253", out j)
• Console.WriteLine(j)
• else Console.WriteLine("String could not be
  parsed.")
• Output 253

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