App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 200 · 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.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 300; // 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 4 (b) line 3 (c) line 2 (d) line 1
2. 2.True or false: a buzz (vibration) is an input. (a) True (b) False
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 64; // typed by the user
   line 2: let friends = 2; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 2 (b) line 1 (c) line 3 (d) line 4
4. 4.Which of these is an input? (a) working out a tip (b) a pop-up message (c) adding up a bill (d) tapping a button
5. 5.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) a pop-up message (d) working out a tip
6. 6.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a result on screen (d) typing your age
7. 7.⚙️ What number does this app show?
   let price = 220; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
9. 9.Which of these is processing? (a) adding up a bill (b) speaking a command (c) a pop-up message (d) typing your age
10. 10.Which of these is an output? (a) a pop-up message (b) working out a tip (c) speaking a command (d) adding up a bill
11. 11.True or false: working out a tip is an output. (a) True (b) False
12. 12.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
13. 13.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
14. 14.Which of these is an input? (a) adding up a bill (b) checking a password (c) working out a tip (d) speaking a command
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 3 (c) line 2 (d) line 1
16. 16.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
19. 19.🔍 Which is the odd one out? (a) a pop-up message (b) speaking a command (c) a result on screen (d) a beep sound
20. 20.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.⚙️ What number does this app show?
    let bill = 216; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
23. 23.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
24. 24.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
25. 25.Which of these is processing? (a) typing your age (b) a buzz (vibration) (c) tapping a button (d) checking a password
26. 26.True or false: speaking a command is an input. (a) False (b) True
27. 27.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ 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
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
30. 30.Which of these is an input? (a) adding up a bill (b) typing your age (c) a pop-up message (d) a result on screen
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
32. 32.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
34. 34.True or false: a result on screen is an input. (a) False (b) True
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // typed by the user
    line 2: let qty = 3; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 2 (c) line 4 (d) line 3
36. 36.Which of these is processing? (a) speaking a command (b) typing your age (c) a pop-up message (d) working out a tip
37. 37.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) tapping a button (d) a buzz (vibration)
38. 38.Which of these is an output? (a) working out a tip (b) typing your age (c) a result on screen (d) sorting the scores
39. 39.True or false: a buzz (vibration) is an output. (a) False (b) True
40. 40.True or false: a beep sound is an output. (a) True (b) False

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