App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 777 · 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 = 95; // 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 4 (b) line 2 (c) line 3 (d) line 1
2. 2.True or false: sorting the scores is an output. (a) False (b) True
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
4. 4.True or false: tapping a button is an output. (a) False (b) True
5. 5.Which of these is an input? (a) a pop-up message (b) a result on screen (c) adding up a bill (d) speaking a command
6. 6.Which of these is an input? (a) working out a tip (b) a result on screen (c) a beep sound (d) typing your age
7. 7.⚙️ 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 3 (b) line 1 (c) line 2
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 60; // 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 3 (d) line 4
9. 9.True or false: a beep sound is an output. (a) True (b) False
10. 10.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
11. 11.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) tapping a button (d) speaking a command
12. 12.🔍 Which is the odd one out? (a) typing your age (b) a result on screen (c) speaking a command (d) taking a photo
13. 13.True or false: typing your age is processing. (a) False (b) True
14. 14.Which of these is processing? (a) a result on screen (b) tapping a button (c) a beep sound (d) checking a password
15. 15.⚙️ 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);
16. 16.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) sorting the scores (d) speaking a command
17. 17.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
19. 19.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
20. 20.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
21. 21.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 400; // 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 1 (b) line 4 (c) line 3 (d) line 2
24. 24.⚙️ 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);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 58; // 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 3 (b) line 2 (c) line 4 (d) line 1
26. 26.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
27. 27.True or false: typing your age is an input. (a) False (b) True
28. 28.Which of these is processing? (a) adding up a bill (b) tapping a button (c) a pop-up message (d) typing your age
29. 29.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
30. 30.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 1 (c) line 3 (d) line 4
32. 32.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
33. 33.Which of these is an output? (a) a beep sound (b) typing your age (c) sorting the scores (d) speaking a command
34. 34.True or false: taking a photo is an input. (a) True (b) False
35. 35.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
36. 36.True or false: working out a tip is processing. (a) False (b) True
37. 37.⚙️ 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
38. 38.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
39. 39.Which of these is an output? (a) taking a photo (b) working out a tip (c) typing your age (d) a pop-up message
40. 40.⚙️ What number does this app show?
    let bill = 228; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);

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