App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 484 · 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 km = 14; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.⚙️ What number does this app show?
   let price = 55; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
3. 3.True or false: taking a photo is processing. (a) True (b) False
4. 4.Which of these is an input? (a) tapping a button (b) a pop-up message (c) a result on screen (d) a beep sound
5. 5.⚙️ What number does this app show?
   let price = 540; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.⚙️ 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);
7. 7.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
8. 8.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 2; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
10. 10.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) speaking a command (d) taking a photo
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 20; // 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 1 (c) line 4 (d) line 2
12. 12.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) a result on screen (d) speaking a command
13. 13.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.True or false: checking a password is processing. (a) False (b) True
16. 16.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
17. 17.True or false: adding up a bill is processing. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) sorting the scores
19. 19.Which of these is processing? (a) taking a photo (b) a result on screen (c) a beep sound (d) checking a password
20. 20.True or false: tapping a button is an input. (a) False (b) True
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 4 (c) line 3 (d) line 1
22. 22.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.Which of these is processing? (a) a buzz (vibration) (b) working out a tip (c) taking a photo (d) a result on screen
24. 24.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
25. 25.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) taking a photo (d) sorting the scores
26. 26.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) taking a photo (d) tapping a button
29. 29.🔍 Which is the odd one out? (a) working out a tip (b) a beep sound (c) sorting the scores (d) checking a password
30. 30.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
31. 31.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 2 (c) line 1 (d) line 3
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 1 (b) line 3 (c) line 4 (d) line 2
34. 34.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
35. 35.⚙️ What number does this app show?
    let bill = 28; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
37. 37.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) speaking a command (d) a pop-up message
38. 38.Which of these is an input? (a) typing your age (b) a result on screen (c) sorting the scores (d) adding up a bill
39. 39.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input

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