App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 710 · 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: taking a photo is an input. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 72; // 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 3 (b) line 2 (c) line 1 (d) line 4
4. 4.⚙️ What number does this app show?
   let price = 430; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
6. 6.🔍 Which is the odd one out? (a) sorting the scores (b) a beep sound (c) a result on screen (d) a buzz (vibration)
7. 7.Which of these is an output? (a) taking a photo (b) a beep sound (c) tapping a button (d) speaking a command
8. 8.True or false: checking a password is an output. (a) False (b) True
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 3; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
10. 10.Which of these is processing? (a) taking a photo (b) speaking a command (c) a beep sound (d) checking a password
11. 11.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) a buzz (vibration) (d) taking a photo
12. 12.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
13. 13.Which of these is processing? (a) a result on screen (b) tapping a button (c) sorting the scores (d) taking a photo
14. 14.Which of these is an input? (a) working out a tip (b) a beep sound (c) a result on screen (d) taking a photo
15. 15.True or false: adding up a bill is processing. (a) True (b) False
16. 16.⚙️ 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 2 (b) line 1 (c) line 3
17. 17.Which of these is processing? (a) tapping a button (b) speaking a command (c) a pop-up message (d) working out a tip
18. 18.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
19. 19.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
20. 20.True or false: tapping a button is an input. (a) False (b) True
21. 21.Which of these is an output? (a) a result on screen (b) checking a password (c) tapping a button (d) taking a photo
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) speaking a command
23. 23.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
24. 24.True or false: sorting the scores is processing. (a) False (b) True
25. 25.⚙️ 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 1 (b) line 4 (c) line 3 (d) line 2
26. 26.⚙️ 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 1 (b) line 4 (c) line 2 (d) line 3
27. 27.True or false: working out a tip is processing. (a) True (b) False
28. 28.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 120; // 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 2 (b) line 1 (c) line 3 (d) line 4
30. 30.Which of these is an input? (a) sorting the scores (b) working out a tip (c) tapping a button (d) a result on screen
31. 31.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
32. 32.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
33. 33.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ What number does this app show?
    let bill = 240; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.⚙️ What number does this app show?
    let bill = 150; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ What number does this app show?
    let bill = 154; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
39. 39.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 1 (b) line 3 (c) line 2 (d) line 4

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