App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 552 · 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 is the odd one out? (a) sorting the scores (b) working out a tip (c) checking a password (d) a buzz (vibration)
2. 2.⚙️ What number does this app show?
   let price = 200; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
4. 4.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ 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 2 (b) line 1 (c) line 3
6. 6.Which of these is an output? (a) checking a password (b) a buzz (vibration) (c) typing your age (d) tapping a button
7. 7.True or false: tapping a button is processing. (a) True (b) False
8. 8.True or false: adding up a bill is processing. (a) True (b) False
9. 9.Which of these is an output? (a) speaking a command (b) working out a tip (c) checking a password (d) a result on screen
10. 10.Which of these is an input? (a) taking a photo (b) a result on screen (c) a buzz (vibration) (d) checking a password
11. 11.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 48; // 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 3 (c) line 2 (d) line 4
13. 13.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
15. 15.Which of these is processing? (a) checking a password (b) taking a photo (c) speaking a command (d) typing your age
16. 16.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a pop-up message (d) speaking a command
17. 17.True or false: checking a password is an input. (a) True (b) False
18. 18.True or false: taking a photo is processing. (a) False (b) True
19. 19.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 1 (d) line 3
21. 21.True or false: a result on screen is processing. (a) True (b) False
22. 22.⚙️ What number does this app show?
    let bill = 144; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
24. 24.Which of these is processing? (a) a buzz (vibration) (b) adding up a bill (c) tapping a button (d) taking a photo
25. 25.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 1 (d) line 4
27. 27.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
28. 28.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
29. 29.True or false: speaking a command is an input. (a) True (b) False
30. 30.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
31. 31.⚙️ 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
32. 32.⚙️ 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 3 (b) line 2 (c) line 1
33. 33.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.True or false: sorting the scores is an input. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) working out a tip (b) speaking a command (c) checking a password (d) adding up a bill
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
37. 37.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
38. 38.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) working out a tip
39. 39.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
40. 40.⚙️ 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);

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