App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 145 · 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) typing your age (b) tapping a button (c) taking a photo (d) checking a password
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 5; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
3. 3.Which of these is processing? (a) tapping a button (b) sorting the scores (c) a result on screen (d) taking a photo
4. 4.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
6. 6.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
7. 7.True or false: a result on screen is an output. (a) False (b) True
8. 8.True or false: sorting the scores is processing. (a) True (b) False
9. 9.⚙️ What number does this app show?
   let bill = 216; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.True or false: working out a tip is an output. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a result on screen (d) taking a photo
12. 12.Which of these is processing? (a) a result on screen (b) adding up a bill (c) speaking a command (d) typing your age
13. 13.Which of these is an input? (a) tapping a button (b) checking a password (c) a buzz (vibration) (d) sorting the scores
14. 14.⚙️ In an app, is tapping a button 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 km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
16. 16.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 168; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 3 (c) line 4 (d) line 1
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
19. 19.Which of these is an input? (a) a buzz (vibration) (b) typing your age (c) sorting the scores (d) a result on screen
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // typed by the user
    line 2: let off = 50; // 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
21. 21.⚙️ 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 3 (c) line 1
22. 22.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.Which of these is an output? (a) a pop-up message (b) working out a tip (c) speaking a command (d) tapping a button
24. 24.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 1 (c) line 2 (d) line 3
26. 26.True or false: speaking a command is an input. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 85; // 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 4 (b) line 1 (c) line 3 (d) line 2
28. 28.Which of these is an input? (a) speaking a command (b) checking a password (c) a buzz (vibration) (d) a pop-up message
29. 29.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) a beep sound (d) working out a tip
30. 30.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 3 (c) line 4 (d) line 1
32. 32.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
33. 33.True or false: adding up a bill is processing. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a buzz (vibration) (d) adding up a bill
35. 35.Which of these is an input? (a) a beep sound (b) sorting the scores (c) checking a password (d) taking a photo
36. 36.True or false: a buzz (vibration) is an input. (a) True (b) False
37. 37.True or false: typing your age is an input. (a) True (b) False
38. 38.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a result on screen (d) taking a photo
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 290; // 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 4 (d) line 3

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