App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 66 · 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) tapping a button (b) adding up a bill (c) speaking a command (d) taking a photo
2. 2.True or false: taking a photo is an input. (a) True (b) False
3. 3.Which of these is an input? (a) tapping a button (b) checking a password (c) a buzz (vibration) (d) a beep sound
4. 4.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) a beep sound
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 108; // 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 4 (c) line 3 (d) line 1
6. 6.Which of these is an input? (a) a result on screen (b) checking a password (c) a beep sound (d) typing your age
7. 7.True or false: speaking a command is processing. (a) True (b) False
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 320; // 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
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 375; // 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 2 (b) line 1 (c) line 3 (d) line 4
10. 10.⚙️ 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 3 (b) line 1 (c) line 2
11. 11.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ What number does this app show?
    let bill = 240; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.Which of these is an output? (a) tapping a button (b) checking a password (c) typing your age (d) a buzz (vibration)
14. 14.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
15. 15.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
16. 16.⚙️ What number does this app show?
    let bill = 264; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.True or false: sorting the scores is processing. (a) True (b) False
18. 18.Which of these is an input? (a) checking a password (b) sorting the scores (c) adding up a bill (d) taking a photo
19. 19.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 1 (b) line 3 (c) line 4 (d) line 2
22. 22.True or false: a buzz (vibration) is an output. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) speaking a command (b) a result on screen (c) a buzz (vibration) (d) a beep sound
24. 24.🔍 Which is the odd one out? (a) typing your age (b) working out a tip (c) checking a password (d) sorting the scores
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 4 (b) line 1 (c) line 2 (d) line 3
26. 26.True or false: working out a tip is an output. (a) True (b) False
27. 27.⚙️ What number does this app show?
    let price = 270; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
32. 32.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
33. 33.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) sorting the scores (d) a beep sound
34. 34.Which of these is an output? (a) tapping a button (b) sorting the scores (c) speaking a command (d) a result on screen
35. 35.True or false: a buzz (vibration) is an input. (a) False (b) True
36. 36.Which of these is processing? (a) a buzz (vibration) (b) a beep sound (c) speaking a command (d) adding up a bill
37. 37.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) a pop-up message (d) speaking a command
38. 38.True or false: a beep sound is an output. (a) True (b) False
39. 39.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
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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