App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 845 · 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.⚙️ What number does this app show?
   let price = 190; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.True or false: adding up a bill is processing. (a) True (b) False
4. 4.⚙️ What number does this app show?
   let km = 7; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) adding up a bill (d) taking a photo
6. 6.Which of these is processing? (a) typing your age (b) tapping a button (c) checking a password (d) a buzz (vibration)
7. 7.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
8. 8.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
9. 9.⚙️ What number does this app show?
   let bill = 200; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.True or false: a beep sound is an input. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) working out a tip (d) tapping a button
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 54; // 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 1 (b) line 4 (c) line 2 (d) line 3
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 135; // 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 1 (b) line 2 (c) line 3 (d) line 4
14. 14.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
15. 15.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) a beep sound (d) adding up a bill
16. 16.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) sorting the scores (d) adding up a bill
17. 17.Which of these is processing? (a) a buzz (vibration) (b) taking a photo (c) sorting the scores (d) tapping a button
18. 18.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
19. 19.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 96; // 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 4 (b) line 2 (c) line 3 (d) line 1
21. 21.Which of these is an output? (a) taking a photo (b) a result on screen (c) tapping a button (d) sorting the scores
22. 22.True or false: sorting the scores is processing. (a) True (b) False
23. 23.Which of these is an input? (a) checking a password (b) working out a tip (c) typing your age (d) a pop-up message
24. 24.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) tapping a button (d) working out a tip
25. 25.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
26. 26.True or false: checking a password is processing. (a) False (b) True
27. 27.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
28. 28.Which of these is processing? (a) typing your age (b) taking a photo (c) a beep sound (d) working out a tip
29. 29.Which of these is an input? (a) a beep sound (b) sorting the scores (c) a result on screen (d) taking a photo
30. 30.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) a buzz (vibration)
32. 32.⚙️ What number does this app show?
    let bill = 98; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.True or false: taking a photo is an input. (a) False (b) True
34. 34.⚙️ What number does this app show?
    let price = 280; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.Which of these is an output? (a) taking a photo (b) speaking a command (c) a pop-up message (d) tapping a button
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 390; // 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
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 136; // 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 1 (d) line 2
38. 38.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
39. 39.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
40. 40.⚙️ What number does this app show?
    let bill = 292; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);

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