App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 118 · 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 line does the processing (works out the answer)?
   line 1: let price = 95; // 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 2 (c) line 4 (d) line 3
2. 2.Which of these is an input? (a) working out a tip (b) checking a password (c) a result on screen (d) tapping a button
3. 3.True or false: sorting the scores is processing. (a) True (b) False
4. 4.⚙️ What number does this app show?
   let bill = 40; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
6. 6.Which of these is an input? (a) speaking a command (b) a result on screen (c) sorting the scores (d) working out a tip
7. 7.🔍 Which is the odd one out? (a) sorting the scores (b) taking a photo (c) tapping a button (d) typing your age
8. 8.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
9. 9.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
10. 10.🔍 Which is the odd one out? (a) a result on screen (b) checking a password (c) a buzz (vibration) (d) a pop-up message
11. 11.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
13. 13.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) working out a tip (d) a result on screen
14. 14.Which of these is an output? (a) checking a password (b) taking a photo (c) a beep sound (d) speaking a command
15. 15.⚙️ What number does this app show?
    let bill = 68; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 530; // 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 3 (b) line 2 (c) line 1 (d) line 4
17. 17.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.Which of these is an output? (a) checking a password (b) tapping a button (c) speaking a command (d) a buzz (vibration)
19. 19.True or false: a beep sound is an output. (a) False (b) True
20. 20.⚙️ What number does this app show?
    let bill = 52; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.True or false: a buzz (vibration) is processing. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) tapping a button (d) taking a photo
23. 23.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
24. 24.True or false: adding up a bill is processing. (a) False (b) True
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (c) line 2 (d) line 3
26. 26.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
27. 27.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) taking a photo (d) tapping a button
28. 28.⚙️ What number does this app show?
    let price = 270; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 4 (c) line 2 (d) line 1
31. 31.Which of these is processing? (a) a result on screen (b) taking a photo (c) tapping a button (d) adding up a bill
32. 32.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) speaking a command (d) adding up a bill
33. 33.True or false: a result on screen is an output. (a) False (b) True
34. 34.True or false: taking a photo is processing. (a) True (b) False
35. 35.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
36. 36.Which of these is an input? (a) typing your age (b) a pop-up message (c) checking a password (d) adding up a bill
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 370; // typed by the user
    line 2: let friends = 5; // 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
38. 38.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ What number does this app show?
    let bill = 104; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output

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