App Inventor Task 1 & 2 - Basic Apps Basic Program #1 - Colour Changer This quick tutorial will teach you how to create an app that changes the background colour when you press different buttons . See the video: In Designer layout, firstly drag four buttons from the Palette tab on the left side and drop them one at a time on top of each other in the Viewer . In the Components tab, click on each button and press Rename to change the name (this makes it easier to code them later). You don't need to choose these four colours, but it is a good idea to start with these (you can change them later). You should notice that you are only changing the name of the button - not the button on the text; these are two different variables . Now to change the text on each button. Click on a button in the centre then in the Properties tab on the right scroll down to Text and change the text to a colour. When you've changed all four button texts, then you can start to code. Click on the Blocks button in the top right to start adding the code. In the Blocks tab on the left click on each button block (e.g. Red, Blue, Green and Yellow) and drag over a 'when click ' block for each colour. Blocks we put inside of the 'when click' blocks will execute whenever that button is pressed. Grab a set Screen 1 BackgroundColor from the Screen1 section in the Blocks tab and place one underneath each when click block. Then line up the correct colour from the Colors section in the Blocks tab to the relevant button. Program 1 Complete! The easiest way to run an app that you have created at home using App Inventor 2 is to download the free MIT AI2 Companion App on your smartphone from the Google Play Store . At the top of the App inventor program on your computer , click on Connect and AI Companion . This will generate a six-digit code you can type into your phone. If your school has the emulator installed, you can also use this to test your app. Ideas to Improve Your App: Use the when Screen1 BackPressed block from the Screen1 section in Blocks to turn the background colour white when the back button is pressed. The block is shown to the right; you can work out how to use it. Add more buttons for different colours. Try purple, black and orange for example. Change the BackgroundColour (in Properties ) of each button to represent the colour it says. You might need to change the TextColour too for red and blue (see the image to the right). Password Checker Basic Program #2 - Password Checker This quick tutorial will teach you how to create an app that requires a user to enter a correct password . See the video - maximise to see it clearly: Firstly you need to grab a TextBox from the Palette tab on the left and place it in the Viewer. Then drag a Button and a Label . Put them in this order: You need to change the Text for the button in the Properties tab to 'Enter Password'. Click on your text box and delete the Hint Text from the Properties tab. Click on the label and delete the Text from the Properties tab. Don't worry, the label is still there! Now time to code. Open up the Blocks layout by clicking Blocks in the top right. Drag a when Button1 click block into the centre from the Button1 section in Blocks . Drag an if then block from Control within the when Button 1 click block. Click on the blue cog button and, in the new window underneath, drag an else block within the if block. The top part will update by itself. When the button is clicked we want to see if the text in the text box matches what we want it to be. Grab an = block from Logic and connect it to the if block. Then place a TextBox1 Text block from TextBox1 in the first half and a blank " " block from Text in the second half. In the " " block write what you want the password to be. I've chosen pikachu because pikachu is cool. Grab a Set Label1 Text block from Label1 and put one next to then and another next to else. Place a " " block from Text and snap it next to both of those blocks. If the user has entered the password correctly then you want 'Correct Password' to appear. Otherwise, if they have entered anything else , you want 'Incorrect Password' to appear. Program 2 Complete! The easiest way to run an app that you have created at home using App Inventor 2 is to download the free MIT AI2 Companion App on your smartphone from the Google Play Store . At the top of the App inventor program on your computer , click on Connect and AI Companion . This will generate a six-digit code you can type into your phone. If your school has the emulator installed, you can also use this to test your app. Ideas to Improve Your App: Change the password to something different. If the correct password is entered change the background to gree n . If an incorrect password is entered change the background to red . You may want to scroll up to the first program as a reminder. KS3 Home Task 3

Learn how to create and use two-dimensional lists in Python. Try practice tasks and learn through text and images. Perfect for students learning GCSE Computer Science in UK schools. top Python 8b - 2D Lists Creating a List with Multiple Dimensions Lists can be given another dimension to hold data that is related to each other . A scenario: Three students have taken two Chemistry tests, and their teacher has recorded the results in a 2-dimensional array (note that Python does not use arrays but uses lists instead): To create this in Python: Printing a 2D List To print the whole list, use a for loop to cycle through each record. I have altered the normal i variable to be 'record', so it is more descriptive: Use the index number to print a specific record . Look at the table above and remember that Python starts counting at 0 so Edward is record 0, Bella 1 and Jacob 2: To print a specific data value, you need to define the record number and then the data index . When using 2D lists, the first value is the row, and the second value is the column . Use the table at the very top to help you visualise this: Practice Task 1 Use the introduction at the top to help you create a 2D list with three friends in the first column, their age in the second column and their favourite colour in the third column. Print the whole list. Then print just the second person's information. Example solution: Searching Through a 2D List To search through a multi-dimensional list then you need to search through each record and then each data element for a specific value: Practice Task 2 Use the 2D list that you created in the first practice task. Ask the user to enter a name. Search through the list and print the record of that person's name. Example solution: ⬅ 8a - Using Lists 8 c - Dictionaries ➡

Learn about the four logical operators - NOT, AND, OR and XOR - and truth tables. Based on the 2020 Eduqas (WJEC) GCSE specification. 2.1: Logical Operators & Truth Tables Exam Board: Eduqas Specification: 2020 What is a logical operator? Inside of each computer system are millions of transistors . These are tiny switches that can either be turned on (represented in binary by the number 1 ) or turned off (represented by 0 ). Logical operators are symbols used to represent circuits of transistors within a computer. The four most common operators are: NOT AND OR XOR What is a truth table? A truth table is a visual way of displaying all possible outcomes of a logical operator. The input and output values in a truth table must be a Boolean value - usually 0 or 1 but occasionally True or False. NOT A NOT logical operator will produce an output which is the opposite of the input . NOT is represented by a horizontal line . Boolean Algebra Notation written as NOT A A Truth Table AND An AND logical operator will output 1 only if both inputs are also 1 . AND is represented by a full stop. Boolean Algebra Notation written as A AND B A.B Truth Table OR An OR logical operator will output 1 if either input is 1 . OR is represented by a plus. Boolean Algebra Notation written as A OR B A+B Truth Table XOR An XOR (exclusive OR) logical operator will output 1 if the inputs are different and output 0 if the inputs are the same . XOR is represented by a circled plus. Boolean Algebra Notation written as A XOR B A B Truth Table Multiple Operations Exam questions will ask you complete truth tables that use more than one logical operator . Work out each column in turn from left to right and look carefully at which column you need to use. Simplification You may be asked to use a truth table to simplify an expression . This is actually really easy. Once you've completed the truth table see if any columns match the final expression . A+B and A+(A+B) both result in the same values , therefore: A+(A+B) can be simplified as just A+B. Q uesto's Q uestions 2.1 - Logical Operators: 1. Copy and complete the following truth tables: 1b. Simplify the expression in the second truth table. 2a. A cinema uses a computer system to monitor how many seats have been allocated for upcoming movies. If both the premium seats and the standard seats are sold out then the system will display a message. State the type of logical operator in this example. 2b. For the more popular movies, the cinema's computer system will also display a message if either the premium seats or the standard seats have exclusively been sold out. However, it will not output a message when both have been sold out. State the type of logical operator in this example. 1.6 - Additional Hardware 2.2 - Boolean Algebra Theory Topics

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