App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 61 · 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 bill = 315; // 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
2. 2.Which of these is processing? (a) a result on screen (b) working out a tip (c) taking a photo (d) a buzz (vibration)
3. 3.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) taking a photo (d) a beep sound
4. 4.True or false: sorting the scores is processing. (a) False (b) True
5. 5.Which of these is an output? (a) checking a password (b) typing your age (c) a pop-up message (d) sorting the scores
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 134; // typed by the user
   line 2: let friends = 2; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 3 (b) line 2 (c) line 1 (d) line 4
7. 7.⚙️ 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);
8. 8.Which of these is processing? (a) a result on screen (b) a beep sound (c) typing your age (d) checking a password
9. 9.Which of these is processing? (a) adding up a bill (b) a pop-up message (c) a buzz (vibration) (d) typing your age
10. 10.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
11. 11.True or false: a buzz (vibration) is an input. (a) True (b) False
12. 12.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 2 (c) line 3 (d) line 1
14. 14.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
16. 16.⚙️ 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);
17. 17.Which of these is an output? (a) checking a password (b) tapping a button (c) a result on screen (d) sorting the scores
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 300; // 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 4 (b) line 3 (c) line 2 (d) line 1
19. 19.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) adding up a bill (d) a beep sound
20. 20.Which of these is an output? (a) taking a photo (b) tapping a button (c) a beep sound (d) working out a tip
21. 21.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.True or false: a result on screen is an output. (a) False (b) True
23. 23.Which of these is an input? (a) checking a password (b) a result on screen (c) a beep sound (d) typing your age
24. 24.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a result on screen
25. 25.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.True or false: speaking a command is processing. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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
28. 28.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.True or false: taking a photo is an input. (a) False (b) True
30. 30.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
31. 31.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a buzz (vibration) (d) speaking a command
32. 32.True or false: sorting the scores is an input. (a) True (b) False
33. 33.True or false: a pop-up message is an output. (a) True (b) False
34. 34.True or false: tapping a button is processing. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) a beep sound (d) checking a password
36. 36.⚙️ What number does this app show?
    let bill = 125; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
38. 38.Which of these is an input? (a) a beep sound (b) sorting the scores (c) tapping a button (d) a result on screen
39. 39.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ What number does this app show?
    let bill = 64; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);

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