LESSON 2 EVENT DRIVEN PROG

INPUT, PROCESS AND OUTPUT

WHAT DOES IPO MEAN

IPO

It is the basic concept of almost all the programming language

CONSOLE.WRITELINE():

IT IS USED TO DISPLAY MESSAGE ON CONSOLE

CONSOLE.READLINE();

IT IS USED FOR DISPLAYING MESSAGE ON CONSOLE

{0}

It is pronounced as place holder that is used for displaying variable value. In the above line

DATA TYPE

is categorized with value type and reference type.

INT AND CHAR

EXAMPLE OF VALUE DATA TYPE

OBJECT

EXAMPLE OF REFERENCE DATA TYPE

IDENTIFIERS

A name for a class, variable, function, method or any other user0defined entity is called an identifier

ALPHANUMERIC CHARACTERS OR UNDERSCORE

WHAT IS THE ONLY ALLOWED CHARACTERS FOR IDENTIFIER?

DIGITS

WHAT SHOULD NOT START AS A IDENTIFIER

NO

SHOULD IDENTIFIERS CONTAIN WITH SPACES

512 CHAR

HOW MANY CHARACTERS DOES C # SUPPORTSAS  IDENTIFIERS

NO

CAN IDENTIFIER CONTAIN TWO CONSECUTIVE UNDERSCORES?

YES

IS C# IDENTIFIERS ALLOW UNICODE CHAR

YES

DOES C# IDENTIFIERS CASE SENSITIVE

USING, PUBLIC, STATIC, VOID, AND INT

EXAMPLES OF KEYWORDS

PROGRAM, MAIN, ABC

EXAMPLES OF IDENTIFIERS

KEYWORDS

ARE RESERVED TERMS THAT THE C# COMPILER HAS PREDEFINED

CONTEXTUAL KEYWORDS

ARE IDENTIFIERS THAT HAVE SPECIAL MEANING IN THE CONTEXT OF THE CODE, SUCH AS GET,SET,INTO,FROM, AND JOIN

YES

CAN @ BE USED AS A PREFIX THE KEYWORD?

VALUE AND REFERENCE TYPES

WHAT ARE THE TWO TYPES OF DATA TYPES

VALUE DATA TYPE

Types will directly store the variable value in memory and it will also accept both signed and unsigned literals.

VARIABLE

refers to the memory address

REFERENCE DATA TYPE

will contain a memory address of variable value because the reference types won’t store the variable value directly in memory. The built-in reference types are  STRING AND OBJECT

STRING AND OBJECT

WHAT ARE THE EXAMPLES OF BUILT IN REFERENCE TYPES

BOXING

When a variable of a value type is converted to object, it’s calle

UNBOXING

. When a variable of type object is converted to a value type, it’s called