App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 71 · 40 questions

Developer's tip (In, work, out): Input → processing → output. Input: typing, tapping, a photo, your voice. Output: a result on screen, a sound, a buzz, a pop-up. In code, the processing line works out a new value from the inputs; show() is the output.

1. 1.True or false: tapping a button is an output. (a) True (b) False
2. 2.Which of these is an input? (a) taking a photo (b) a buzz (vibration) (c) working out a tip (d) a result on screen
3. 3.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) a pop-up message (d) taking a photo
4. 4.🔍 Which is the odd one out? (a) typing your age (b) checking a password (c) working out a tip (d) sorting the scores
5. 5.Which of these is an input? (a) a result on screen (b) typing your age (c) working out a tip (d) adding up a bill
6. 6.Which of these is processing? (a) speaking a command (b) sorting the scores (c) a pop-up message (d) typing your age
7. 7.Which of these is an output? (a) speaking a command (b) a buzz (vibration) (c) sorting the scores (d) taking a photo
8. 8.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) sorting the scores
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 12; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 2 (c) line 1 (d) line 4
11. 11.🔍 Which is the odd one out? (a) a pop-up message (b) checking a password (c) a result on screen (d) a beep sound
12. 12.True or false: taking a photo is an output. (a) False (b) True
13. 13.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
14. 14.Which of these is an input? (a) working out a tip (b) a beep sound (c) a pop-up message (d) tapping a button
15. 15.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.🔍 Which is the odd one out? (a) a result on screen (b) sorting the scores (c) adding up a bill (d) checking a password
17. 17.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 186; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 2 (c) line 1 (d) line 3
19. 19.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 120; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 3 (c) line 4 (d) line 1
21. 21.True or false: speaking a command is an input. (a) True (b) False
22. 22.Which of these is processing? (a) tapping a button (b) checking a password (c) taking a photo (d) typing your age
23. 23.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
24. 24.True or false: a buzz (vibration) is an output. (a) False (b) True
25. 25.Which of these is an output? (a) a result on screen (b) working out a tip (c) taking a photo (d) checking a password
26. 26.True or false: working out a tip is an output. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) a beep sound (b) speaking a command (c) taking a photo (d) typing your age
28. 28.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a result on screen (d) speaking a command
29. 29.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
30. 30.Which of these is an output? (a) a beep sound (b) tapping a button (c) typing your age (d) sorting the scores
31. 31.True or false: a pop-up message is an input. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) tapping a button (d) typing your age
33. 33.True or false: a result on screen is an output. (a) True (b) False
34. 34.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.True or false: sorting the scores is an output. (a) True (b) False
36. 36.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
37. 37.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) working out a tip (d) checking a password
40. 40.⚙️ What number does this app show?
    let bill = 168; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);

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