App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 20 · 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 km = 9; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
2. 2.⚙️ What number does this app show?
   let bill = 30; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 40; // 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 2 (b) line 1 (c) line 4 (d) line 3
4. 4.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
6. 6.Which of these is an output? (a) speaking a command (b) adding up a bill (c) a result on screen (d) tapping a button
7. 7.True or false: a beep sound is an output. (a) False (b) True
8. 8.⚙️ What number does this app show?
   let bill = 132; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.True or false: tapping a button is an output. (a) False (b) True
10. 10.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
11. 11.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
12. 12.Which of these is processing? (a) tapping a button (b) working out a tip (c) taking a photo (d) a buzz (vibration)
13. 13.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) tapping a button (d) speaking a command
14. 14.Which of these is an input? (a) a buzz (vibration) (b) a result on screen (c) working out a tip (d) typing your age
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 3 (b) line 2 (c) line 1 (d) line 4
16. 16.True or false: a buzz (vibration) is an output. (a) False (b) True
17. 17.Which of these is processing? (a) tapping a button (b) speaking a command (c) a result on screen (d) checking a password
18. 18.True or false: sorting the scores is processing. (a) True (b) False
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
20. 20.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
21. 21.True or false: working out a tip is processing. (a) False (b) True
22. 22.Which of these is an output? (a) taking a photo (b) speaking a command (c) a pop-up message (d) working out a tip
23. 23.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
24. 24.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
25. 25.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) speaking a command (d) sorting the scores
26. 26.⚙️ What number does this app show?
    let bill = 118; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) a pop-up message (d) speaking a command
30. 30.True or false: typing your age is an input. (a) True (b) False
31. 31.Which of these is an input? (a) a result on screen (b) taking a photo (c) a buzz (vibration) (d) a beep sound
32. 32.⚙️ 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 3 (b) line 1 (c) line 2
33. 33.⚙️ 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);
34. 34.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
36. 36.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
37. 37.True or false: working out a tip is an input. (a) False (b) True
38. 38.⚙️ 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 1 (b) line 2 (c) line 4 (d) line 3
39. 39.Which of these is an input? (a) a pop-up message (b) a beep sound (c) a buzz (vibration) (d) speaking a command
40. 40.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);

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