App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 311 · 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.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
2. 2.⚙️ 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 3 (b) line 1 (c) line 4 (d) line 2
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
4. 4.⚙️ What number does this app show?
   let price = 180; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.True or false: a beep sound is an output. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) typing your age (d) working out a tip
8. 8.Which of these is an input? (a) checking a password (b) a buzz (vibration) (c) typing your age (d) working out a tip
9. 9.True or false: tapping a button is processing. (a) False (b) True
10. 10.Which of these is processing? (a) tapping a button (b) speaking a command (c) a pop-up message (d) checking a password
11. 11.Which of these is an output? (a) taking a photo (b) sorting the scores (c) a buzz (vibration) (d) working out a tip
12. 12.⚙️ 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);
13. 13.True or false: a pop-up message is an input. (a) True (b) False
14. 14.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 3 (b) line 1 (c) line 4 (d) line 2
16. 16.🔍 Which is the odd one out? (a) checking a password (b) a pop-up message (c) a result on screen (d) a buzz (vibration)
17. 17.True or false: adding up a bill is an input. (a) True (b) False
18. 18.⚙️ 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 4 (b) line 2 (c) line 1 (d) line 3
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
20. 20.⚙️ 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);
21. 21.⚙️ What number does this app show?
    let bill = 78; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 87; // 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 3 (c) line 2 (d) line 1
23. 23.⚙️ 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 2 (b) line 4 (c) line 3 (d) line 1
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // typed by the user
    line 2: let off = 30; // 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
25. 25.⚙️ 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);
26. 26.True or false: tapping a button is an input. (a) True (b) False
27. 27.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.True or false: speaking a command is an output. (a) True (b) False
29. 29.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) taking a photo (d) a pop-up message
32. 32.True or false: sorting the scores is an input. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
34. 34.True or false: sorting the scores is processing. (a) False (b) True
35. 35.⚙️ What number does this app show?
    let bill = 228; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a pop-up message (d) working out a tip
37. 37.Which of these is processing? (a) speaking a command (b) typing your age (c) a beep sound (d) working out a tip
38. 38.Which of these is an input? (a) a result on screen (b) adding up a bill (c) a buzz (vibration) (d) taking a photo
39. 39.Which of these is an output? (a) a pop-up message (b) sorting the scores (c) tapping a button (d) adding up a bill
40. 40.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);

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