What is an assignment operation?
An assignment operator sets the value of a variable, constant, or other item in the code behind of a Page class.
The assignment statement is so fundamental to computer programming that every procedural/imperative programming language requires such a statement—regardless of its syntax.
Name the two important types used within the .NET Framework.
- Value Types
- Reference Types
What is the difference between value type, and reference type variables?
A variable of value type contains an instance of the type and has a set memory size.
A reference type contains a pointer (or a reference) to an instance of a type which does not have an allocated memory.
Name the 2 sizes (in bits) of unicode characters?
- 16 bits
- 32 bits
Variable Declarations Summary
- To declare a variable, its type must be explicitly defined, and it must be given a name.
- C# will give new variables a default value, however it is beter to explicitly define a starting value.
-
Constant Declarations Summary
- A constant is a fixed value that cannot be modified during the execution of a program.
- Can be both value and reference type.
- To declare a constant, we specifically use the word const.
Assignment Operators Summary
- Simple assignment operators store a value with no calculation to change the value. X = Y
- Compound assignment operators store a value but perform a calculation which will alter the initial value. X += Y (Equivalent to X = X + Y)
What is the difference between simple and compound assignment operators?
Simple assignment operators store a value (X = Y) whereas compound assignment operators store a value before/after performing some calculation on the value.
(X += Y Equivalent to X = X + Y)
Ennumeration Summary
- An ennumeration is a set of named constants of a specific type.
- You use an enumeration type to represent a choice from a set of mutually exclusive values or a combination of choices.
What is an enumeration?
An ennumeration is a set of constants of a specific type.
They provide a way to declare and use a set of relatable constants that can be assignmed to a variable in the code behind.
Exception Handling Summary
- An exception occurs in response to a runtime error. (an error that occurs during the execution of a computer program.
- Exception handling allows us to deal with errors gracefully instead of having an application crash.
Exception Class Summary
- There are over 20 exceptions that the .NET Common Language Runtime can throw and that we can handle using the Exception Class.
-
Conversion Operations Summary
- A conversion operation alters the value of one type so that it can be ised in a variable of another type.
- Can be Widening or Narrowing conversions.
- Widening conversions always preserve the value of the source variable as the target variable can fully accomadate the possible range of values of the source variable.
- Narrowing conversions must be performed when the target type cannot accomadate the value of the source variable.
Control Operations Summary
- Decision Operations ater the path of a programs execution based on the result of a logical operation.
- Iterative Operations execute a block of code repeatedly while a condition is met.
String Operations Summary
- A string operation is a process that is performed on a string object.
- A string is a type that has been instantiated from the string class. (Usually a sequence of characters that are meant to be “read” as written)
What is an escape character?
An escape character is a character that changes the meaning of the character (or characters) that follow it within a string.
What is a verbatim literal?
Verbatim literals in C# can be used to write out a string “word for word”. They (almost) negate the need for escape sequences.
What is an array?
An array is a container that holds data while it is being manipulated by a computer program.
It is a data structure that consists of a collection of elements of the same type, where each element contains its own value and is identified by one or more indices.
What is a stack?
A stack is a one-dimensional last-in-first-out (LIFO) data structure that contains zero or more objects.
Operations on the stack can only occur at the top of the stack.
What is a queue?
A queue is a one dimensional first-in-first-out (FIFO) data structure that contains zero or more objects.
Operations on a queue can only occur at the beggninig of a queue. (the object that joined the queue first)
Collection Operations Summary
- A collection is a container that holds data while it is being manipulated by a computer program. More specifically, it is a data structure that consists of \ero or more items where each item contains its own value or values.
- Some examples include: Stacks, Queues, Linked Lists and Sorted Lists.
File System Operations Summary
- A file system defines how a computers data is structured.
- When developing Web applications, we often encounter the need to interact with the Web server’s file system to perform such operations.
- The File class permits us to do such things as create/read/write from files, and get or set properties of files.
Class Design Summary
- Class design is the process of planning the properties, methods, and events of a class.
- Classes should be designed with reusability in mind.
- A high degree of cohesion should be sought.
- A low degree of coupling should also be sought.
