App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 476 · 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 = 85; // 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.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 25; // typed by the user
   line 2: let qty = 5; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 3 (b) line 2 (c) line 4 (d) line 1
3. 3.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 38; // 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 4 (b) line 3 (c) line 2 (d) line 1
5. 5.Which of these is processing? (a) typing your age (b) a buzz (vibration) (c) checking a password (d) a pop-up message
6. 6.True or false: adding up a bill is an output. (a) True (b) False
7. 7.True or false: a buzz (vibration) is processing. (a) False (b) True
8. 8.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
9. 9.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // typed by the user
    line 2: let qty = 5; // 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
11. 11.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
12. 12.🔍 Which is the odd one out? (a) working out a tip (b) a result on screen (c) sorting the scores (d) adding up a bill
13. 13.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) speaking a command (d) taking a photo
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 54; // 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 4 (c) line 3 (d) line 1
16. 16.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) sorting the scores (d) a pop-up message
17. 17.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
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 1 (c) line 3
20. 20.Which of these is an input? (a) a beep sound (b) adding up a bill (c) typing your age (d) a buzz (vibration)
21. 21.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
22. 22.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) speaking a command (d) typing your age
23. 23.⚙️ What number does this app show?
    let bill = 75; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ 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);
25. 25.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) checking a password (d) speaking a command
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
27. 27.⚙️ What number does this app show?
    let bill = 134; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.Which of these is processing? (a) speaking a command (b) typing your age (c) working out a tip (d) taking a photo
29. 29.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a beep sound (d) adding up a bill
30. 30.Which of these is an output? (a) sorting the scores (b) taking a photo (c) a beep sound (d) working out a tip
31. 31.Which of these is processing? (a) taking a photo (b) a pop-up message (c) sorting the scores (d) a beep sound
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 330; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 1 (c) line 4 (d) line 2
33. 33.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 1 (c) line 4 (d) line 2
35. 35.True or false: taking a photo is an input. (a) False (b) True
36. 36.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
37. 37.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) speaking a command (d) sorting the scores

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