1.2.4

• Assembly language

  little man computer(LMC)

  how many assembly instructions does it have

  11
• Assembly language

  little man computer(LMC)

  little man computer addressing

  assembly language is a low-level and use different types of address to access memory locations

  so what does LMC support

  only support direct addressing of memory location
• Assembly language

  little man computer(LMC)

  what does it allow user to see

  to see how the registers and memory locations are used in a processor
• Assembly language

  little man computer(LMC)

  what is it

  is a virtual implementation of a van neuman processor that allows people to test out a basic assembly language compiler
• Assembly language

  Little man computer

  Examples of mnemonics:


  ADD, SUB, OUT, INP
• Assembly language

  what is this

  use 3 letter mnemonics for key actions(such as INP for input), makes it easier for developers
• Little man computer

  What does the LMC only support

  Only support direct addressing of memory location
• Little man computing addressing

  What is assembly language

  Is a low level and use different types of address to memory locations
• Machine code instructions(Binary form)

  Machine code instruction will have different what?

  Different sized instructions based on their architecture
• Machine code instructions

  Info:

  64-bits Processors will have instructions that are 64 bits in size
• Machine code instructions

  Is a low level language that control what ?

  CPU

  (Instructions are split into sections

  ●first section is basic machine operation(+×÷-)

  ●second section is the adressing mode(is usually stored in 2 bits) (addressing code tells the processor which typee of addressing to use on the operand code(opcode)

  ●the final part is the opcode,which will be translated differently depending on the type of address mode used)
• machine code(binary form)

  low-level language that controls the CPU

  instructions are split into sections

  what is the first and second section

  and the final part

  and for the second section, what the addressing code tells you


  first section is basic machine operations(+-%)

  second section is the addressing mode(is usually stored in 2bits)

  -adressing tell the processor which type of addressing to use on the operand code(opcode)

  the final part is the opcode, which will be translated differently depending on the type of address mode used
• machine code(binary form)

  machine code instructions will have...


  different sized instructions based on their architecture

  -64 bits processor will have instructions that are 64 bits in size
• Encapsulation

  Setters and getters

  A setter and getter are special type of method that...

  Finish for Setters and Getters


  Setters: sets one of the attributes equal to a specific value

  Getters: obtains the value of one of the attri used of the object
• Encapsulation

  What is information hiding

  Each attribute can only be accessed or modified by methods that are set(encapsulated) when defining the class
• Encapsulation

  What is the purpose

  The use of these methods protects data in the class instance from being tampered with
• Polymorphism

  Overloading

  The method might also have a different return types 


  Example: a shape superclass might have an area calculating functions

  -the superclass circle could have the function area(radius), whereas as triangle subclass could have the function area(base,height)
• Polymorphism

  Overriding what happens to the method that is defined

  The method that is defined in the subclass overrides the method defined in the superclass
• Polymorphism

  What is it

  When a subclass alters its inherited methods in two ways by:

  Overloading

  Overriding
• Polymorphism

  What is overloading

  When a method is defined in the subclass that has the same name,but different arguments to a method defined in the superclass
• Polymorphism

  What is overriding

  Is when a method is redefined in the subclass with the same name and same argument
• What is encapsulation

  Is a principle that concerns how data inside the class can be assessed or changed
• mode of addressing memory

  direct addressing

  here what is the opcode for

  is the address for the memory location where data can be found
• mode of addressing memory

  direct addressing

  in the little man com[uterm(LMC), this is the only type of addressing available

  true of false

  true
• mode of addressing memory

  direct memory

  the value is not given directly, to get it the CPU has to what

  to retrieve from the given memory location
• mode of addressing memory

  immediate addressing

  if we used the immediate addressing, the binary opcode of 00000101 and give it to the cpu what will it give us

  5
• mode of addressing memory

  immediate addressing

  why is this a way to give the data directly to the processor

  so it doesnt need to access another memory location
• mode of addressing memory

  indexed addressing

  what is the index register value

  is a constant value that indicates the first memory location for an array of data items
• mode of addressing memory

  indexed addressing

  what is the opcode here

  the value that is added with a value stored in the index register to give the location of the data to be used
• mode of addressing memory

  indirect addressing

  by using this addressing, the CPU can access what

  a significantly higher number of adressable locations
• mode of addressing memory

  indirect addressing

  what is the opcode here


  is the location of the value to be used(this is usually a register)
• mode of addressing

  in which type of addressing does the opcode specifiy the address memory location of the value to be used


  direct
• modes of addressing memory

  immediate addressing

  in this addressing, what is the opcode like


  the opcode is the actual value to be used
• object orientated languages

  class

  accessing attributes

  if its public, it can be accessed outside the class

  aobject attributes are accessed using dot notation:


  int attr = myObj.attr;
• object orientated languages

  class

  calling methods

  if a methods of an object is public then it can be accessed...

  object methods are accessed using the dot notation:

  from the outside the class

  -myObj.dosomething();
• object orientated languages

  class

  classes in java

  in java, classes are created uaing the class keyword

  these classes can be made what

  public(can beused in any part of the program) using the public class keyword)
• object orientated languages

  class

  creating an object

  objects are made from what

  to create an object we use the keyword --- and the name of the ---:

  new, class

  myClass myObj = new myClass();
• object orientated languages

  class

  how would the attribute name of the class myclass be accessed?

  myClass.name
• object orientated languages

  class

  one class will often represent what

  one type of real world object(basketball game represent "ball" class)
• object orientated languages

  class

  what is inside a class

  hint:contain 2 main components

  attributes:these are variables which describe the object

  method:these are subroutines which allow the object to perform actions