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AS AQA Computer Science 2016 Revision Help watch

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    (Original post by mahmzo)
    Ok a List is an Array, it is a very fundamental data structure lol. You can declare one using (in Python) square brackets ([ ])
    What we have there is an empty list, you can do ALOT using lists, they are a very strong for programmers because they are muteable (changeable).

    Parameters are used in functions (def etc etc), the parameters can be used to do alot of things such as move data from one function to other (very bad explanation). It can stop the use of global variables which are not good to have when coding.

    EG
    def main():
    a = 5
    example(a) # here the function example is taking one parameter (a)
    Thank you why are global variables bad? Xx
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    (Original post by abc_123_)
    The difference between lists and arrays and why they help writing code easier
    Also what do parameters do and why they make programs easier? Xx
    Sorry I don't understand the revision guide xxx
    It's okay the revision guides for computing really aren't very good.

    A list is an array but an array isn't always a list. For gcse I expect that you would just need to know that lists are one dimensional data structures that store data of more than one type. An array can be multi-dimensional with each location in the array referenced by one or more index numbers depending on the number of dimensions but each 'box' must contain data of the same type. Look at bbc bite size for gcse computing as they give a very good notes on this topic.

    Parameters are variables names that are passed into functions to allow the passing of local variables between functions. Again bbc bite size explains this quite well

    Hope that helps
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    (Original post by OllieGidman)
    It's okay the revision guides for computing really aren't very good.

    A list is an array but an array isn't always a list. For gcse I expect that you would just need to know that lists are one dimensional data structures that store data of more than one type. An array can be multi-dimensional with each location in the array referenced by one or more index numbers depending on the number of dimensions but each 'box' must contain data of the same type. Look at bbc bite size for gcse computing as they give a very good notes on this topic.

    Parameters are variables names that are passed into functions to allow the passing of local variables between functions. Again bbc bite size explains this quite well

    Hope that helps
    Thank you that helped a lot xx
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    They are always contained in memory even when not being used. They have a scope of the whole program. Itd better to use local variables which have a smaller scope
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    (Original post by OllieGidman)
    It's okay the revision guides for computing really aren't very good.

    A list is an array but an array isn't always a list. For gcse I expect that you would just need to know that lists are one dimensional data structures that store data of more than one type. An array can be multi-dimensional with each location in the array referenced by one or more index numbers depending on the number of dimensions but each 'box' must contain data of the same type. Look at bbc bite size for gcse computing as they give a very good notes on this topic.

    Parameters are variables names that are passed into functions to allow the passing of local variables between functions. Again bbc bite size explains this quite well

    Hope that helps
    Hiya I'm so sorry but could you explain the cache to me please? x
    Like this diagram
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    (Original post by abc_123_)
    Hiya I'm so sorry but could you explain the cache to me please? x
    Like this diagram
    Uh ill try my best.

    Cache is basically a small volume of fast RAM. In other words its another type of memory. But its used so that the processor doesnt need to specifically retrieve the information from the main memory. Its faster and easier for the processor.

    Again its hard to explain lol from the diagram as you see the information gets retrieved fron cache. It stores instructions that are frequently used in software.

    As the processsor processes the data it would look into the cache memory first then if the instruction is not found then itll go in to the main memory
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    (Original post by DibbyDabby)
    Does anyone know of any good revision sites for this course ?

    I'm struggling to find any resources.

    Also if you have any questions or need any help feel free to ask
    https://www.youtube.com/watch?v=_rV4aQ9ojUg
    https://en.wikibooks.org/wiki/A-leve...er1_this_year)
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    please i got the exam tomorrow this is my code:

    ''
    -
    'Skeleton Program for the AQA AS Paper 1 Summer 2016 examination
    'this code should be used in conjunction with the Preliminary Material
    'written by the AQA Programmer Team
    'developed in the Visual Studio 2008 programming environment

    'Version Number 1.0

    Imports System.IO

    Module Module1
    Const TrainingGame As String = "Training.txt"
    Dim score As Integer = 0
    Dim Missiles As Integer = 50

    Structure TShip
    Dim Name As String
    Dim Size As Integer
    End Structure

    Sub GetRowColumn(ByRef Row As Integer, ByRef Column As Integer)


    Console.WriteLine()
    Console.WriteLine("Please enter 11 to return to menu and 12 to quit!")
    Console.WriteLine("You currently have a score of " & score & " points! ")
    Console.WriteLine("You have " & Missiles & " missiles left!")

    If Missiles = 0 Then
    Console.ForegroundColor = ConsoleColor.Red
    Console.WriteLine("Game Over!!! No More Missiles Left! ")
    Console.ResetColor()
    End If


    Do
    Console.Write("Pleaser column: ")
    Column = Console.ReadLine()


    If Column = 11 Then

    Main()
    ElseIf Column = 12 Then
    End
    End If
    If Column > -1 And Column < 13 Then
    Exit Do
    Else : Console.WriteLine("Please enter a boundary between 0 - 10")
    End If
    Loop

    Do
    Console.Write("Pleaser row: ")
    Row = Console.ReadLine()
    If Row = 11 Then
    Main()
    ElseIf Row = 12 Then
    End
    End If
    If Row > -1 And Row < 13 Then
    Exit Do
    Else : Console.WriteLine("Please enter a boundary between 0 - 10")
    End If
    Loop
    Console.WriteLine()
    End Sub

    Sub MakePlayerMove(ByRef Board(,) As Char, ByRef Ships() As TShip)
    Dim Row As Integer
    Dim Column As Integer
    GetRowColumn(Row, Column)
    If Board(Row, Column) = "m" Or Board(Row, Column) = "h" Then
    Console.WriteLine("Sorry, you have already shot at the square (" & Column & "," & Row & "). Please try again.")
    ElseIf Board(Row, Column) = "-" Then
    Console.WriteLine("Sorry, (" & Column & "," & Row & ") is a miss.")
    Board(Row, Column) = "m"
    If Board(Row, Column) = "m" Then
    Missiles = (Missiles - 1)
    End If
    Else
    Console.WriteLine("Hit at (" & Column & "," & Row & ").")

    If Board(Row, Column) = "A" Then
    Board(Row, Column) = "h"
    Missiles -= 1
    score = (score + 5)
    Console.WriteLine("You have hit part of the Aircraft carrier")

    ElseIf Board(Row, Column) = "B" Then
    Board(Row, Column) = "h"
    Missiles -= 1
    score = (score + 4)
    Console.WriteLine("You have hit part of the Battleship")

    ElseIf Board(Row, Column) = "S" Then
    Board(Row, Column) = "h"
    Missiles -= 1
    score += 3
    Console.WriteLine("You have hit part of the Submarine")

    ElseIf Board(Row, Column) = "D" Then
    Board(Row, Column) = "h"
    Missiles -= 1
    score += 2
    Console.WriteLine("You have hit part of the Destroyer")

    ElseIf Board(Row, Column) = "P" Then
    Board(Row, Column) = "h"
    Missiles -= 1
    score += 1
    Console.WriteLine("You have hit part of the Patrol Boat")

    ElseIf Board(Row, Column) = "C" Then
    Board(Row, Column) = "h"
    Missiles -= 1
    score += 1
    Console.WriteLine("You have hit part of the Cruiser")
    End If
    End If
    End Sub

    Sub SetUpBoard(ByRef Board(,) As Char)
    Dim Row As Integer
    Dim Column As Integer
    For Row = 0 To 10
    For Column = 0 To 10
    Board(Row, Column) = "-"
    Next
    Next
    End Sub

    Sub LoadGame(ByVal Filename As String, ByRef Board(,) As Char)
    Dim Row As Integer
    Dim Column As Integer
    Dim Line As String
    Using FileReader As StreamReader = New StreamReader(Filename)
    For Row = 0 To 10
    Line = FileReader.ReadLine()
    For Column = 0 To 10
    Board(Row, Column) = Line(Column)

    Next
    Next
    End Using
    End Sub
    Sub Savegame(ByRef Board(,) As Char)
    Dim Row, Column As Integer
    Dim Line As String

    Using Filewriter As StreamWriter = New StreamWriter("SavedGame.txt")
    For Row = 0 To 10
    For Column = 0 To 10
    Line = Board(Row, Column)
    Filewriter.WriteLine(Line)

    Next
    Next

    End Using
    End Sub

    Sub PlaceRandomShips(ByRef Board(,) As Char, ByVal Ships() As TShip)
    Dim Valid As Boolean
    Dim Row As Integer
    Dim Column As Integer
    Dim Orientation As Char
    Dim HorV As Integer
    For Each Ship In Ships
    Valid = False
    While Not Valid
    Row = Int(Rnd() * 11)
    Column = Int(Rnd() * 11)
    HorV = Int(Rnd() * 2)
    If HorV = 0 Then
    Orientation = "v"
    Else
    Orientation = "h"
    End If
    Valid = ValidateBoatPosition(Board, Ship, Row, Column, Orientation)
    End While
    Console.WriteLine("Computer placing the " & Ship.Name)
    PlaceShip(Board, Ship, Row, Column, Orientation)
    Next
    End Sub

    Sub PlaceShip(ByRef Board(,) As Char, ByVal Ship As TShip, ByVal Row As Integer, ByVal Column As Integer, ByVal Orientation As Char)
    Dim Scan As Integer
    If Orientation = "v" Then
    For Scan = 0 To Ship.Size - 1
    Board(Row + Scan, Column) = Ship.Name(0)
    Next
    ElseIf Orientation = "h" Then
    For Scan = 0 To Ship.Size - 1
    Board(Row, Column + Scan) = Ship.Name(0)
    Next
    End If
    End Sub

    Function ValidateBoatPosition(ByVal Board(,) As Char, ByVal Ship As TShip, ByVal Row As Integer, ByVal Column As Integer, ByVal Orientation As Char)
    Dim Scan As Integer
    If Orientation = "v" And Row + Ship.Size > 10 Then
    Return False
    ElseIf Orientation = "h" And Column + Ship.Size > 10 Then
    Return False
    Else
    If Orientation = "v" Then
    For Scan = 0 To Ship.Size - 1
    If Board(Row + Scan, Column) <> "-" Then
    Return False
    End If
    Next
    ElseIf (Orientation = "h") Then
    For Scan = 0 To Ship.Size - 1
    If Board(Row, Column + Scan) <> "-" Then
    Return False
    End If
    Next
    End If
    End If
    Return True
    End Function

    Function CheckWin(ByVal Board(,) As Char)
    Dim Row As Integer
    Dim Column As Integer
    For Row = 0 To 10
    For Column = 0 To 10
    If Board(Row, Column) = "A" Or Board(Row, Column) = "B" Or Board(Row, Column) = "S" Or Board(Row, Column) = "D" Or Board(Row, Column) = "P" Or Board(Row, Column) = "C" Then
    Return False
    End If
    Next
    Next
    Return True
    End Function

    Sub PrintBoard(ByVal Board(,) As Char)
    Dim Row As Integer
    Dim Column As Integer
    Console.WriteLine()
    Console.WriteLine("The board looks like this: ")
    Console.WriteLine()
    Console.Write(" ")
    For Column = 0 To 10
    Console.Write(" " & Column & " ")
    Next
    Console.WriteLine()
    For Row = 0 To 10
    Console.Write(Row & " ")
    For Column = 0 To 10
    If Board(Row, Column) = "-" Then
    Console.Write(" ")
    ElseIf Board(Row, Column) = "A" Or Board(Row, Column) = "B" Or Board(Row, Column) = "S" Or Board(Row, Column) = "D" Or Board(Row, Column) = "P" Or Board(Row, Column) = "C" Then
    Console.Write(" ")
    Else
    Console.Write(Board(Row, Column))
    End If
    If Column <> 10 Then
    Console.Write(" | ")
    End If
    Next
    Console.WriteLine()
    Next
    End Sub

    Sub DisplayMenu()
    Console.WriteLine("MAIN MENU")
    Console.WriteLine()
    Console.WriteLine("1. Start new game")
    Console.WriteLine("2. Load training game")
    Console.WriteLine("9. Quit")
    Console.WriteLine()
    End Sub

    Function GetMainMenuChoice()
    Dim Choice As Integer
    Console.Write("Pleaser your choice: ")
    Choice = Console.ReadLine()
    Console.WriteLine()
    Return Choice
    End Function

    Sub PlayGame(ByVal Board(,) As Char, ByVal Ships() As TShip)
    Dim GameWon As Boolean = False
    Do
    PrintBoard(Board)
    MakePlayerMove(Board, Ships)
    GameWon = CheckWin(Board)
    If GameWon Then
    Console.WriteLine("All ships sunk!")
    Console.WriteLine()
    End If
    Loop Until GameWon
    End Sub

    Sub SetUpShips(ByRef Ships() As TShip)
    Ships(0).Name = "Aircraft Carrier [Worth 5 points]"
    Ships(0).Size = 5
    Ships(1).Name = "Battleship [Worth 4 points]"
    Ships(1).Size = 4
    Ships(2).Name = "Submarine [Worth 3 points]"
    Ships(2).Size = 3
    Ships(3).Name = "Destroyer [Worth 2 points]"
    Ships(3).Size = 3
    Ships(4).Name = "Patrol Boat [Worth 1 point]"
    Ships(4).Size = 2
    Ships(5).Name = "Cruiser [Worth 1 point]"
    Ships(5).Size = 1
    End Sub

    Sub Main()
    Dim Board(10, 10) As Char
    Dim Ships(5) As TShip
    Dim MenuOption As Integer
    Do
    SetUpBoard(Board)
    SetUpShips(Ships)
    DisplayMenu()
    MenuOption = GetMainMenuChoice()
    If MenuOption = 1 Then
    PlaceRandomShips(Board, Ships)
    PlayGame(Board, Ships)
    ElseIf MenuOption = 2 Then
    LoadGame(TrainingGame, Board)
    PlayGame(Board, Ships)
    End If
    Loop Until MenuOption = 9
    End Sub
    End Module
    -
    "

    how can I call the savegame when user enters 11 or 12 when choosing what co ordinates to enter?
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    Does anyone else feel they don't know slot even when I do
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    as you can easly crack it with brut force ( try shifting the alphabet unitl the encryption makes sence)
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    Overall paper 2 went well, a few tricky questions such as the Assembly language question.

    Predicted grade boundaries:
    A - 56
    B - 49
    C- 44
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    REP PLEASE

    Unofficial mark scheme Paper 2

    https://docs.google.com/document/d/1...4Chsp2FMY/edit
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    (Original post by mahmzo)
    REP PLEASE

    Unofficial mark scheme Paper 2

    https://docs.google.com/document/d/1...4Chsp2FMY/edit
    Don't have a google account, anyway you could make it public for people without google accounts?


    Posted from TSR Mobile
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    (Original post by theamazingone)
    Don't have a google account, anyway you could make it public for people without google accounts?

    Done
    Posted from TSR Mobile
    Done
 
 
 
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Updated: June 18, 2016
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