App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 399 · 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.⚙️ What number does this app show?
   let bill = 160; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.Which of these is an input? (a) adding up a bill (b) speaking a command (c) working out a tip (d) a pop-up message
3. 3.Which of these is an output? (a) a pop-up message (b) typing your age (c) tapping a button (d) speaking a command
4. 4.True or false: typing your age is an input. (a) True (b) False
5. 5.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
6. 6.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
7. 7.True or false: speaking a command is an input. (a) True (b) False
8. 8.True or false: working out a tip is processing. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let price = 65; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 160; // 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 4 (d) line 1
11. 11.🔍 Which is the odd one out? (a) sorting the scores (b) tapping a button (c) adding up a bill (d) working out a tip
12. 12.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) typing your age (d) tapping a button
14. 14.⚙️ In an app, is a pop-up message 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 = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
16. 16.Which of these is processing? (a) typing your age (b) speaking a command (c) sorting the scores (d) a beep sound
17. 17.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 2 (c) line 4 (d) line 3
19. 19.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // typed by the user
    line 2: let qty = 3; // 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
21. 21.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) taking a photo (d) typing your age
23. 23.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.Which of these is processing? (a) tapping a button (b) taking a photo (c) a buzz (vibration) (d) working out a tip
25. 25.True or false: sorting the scores is processing. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) a pop-up message (d) tapping a button
27. 27.⚙️ 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 1 (b) line 2 (c) line 3
28. 28.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
29. 29.Which of these is an input? (a) sorting the scores (b) a buzz (vibration) (c) typing your age (d) checking a password
30. 30.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 390; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 3 (c) line 4 (d) line 1
32. 32.⚙️ What number does this app show?
    let bill = 390; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.Which of these is processing? (a) taking a photo (b) checking a password (c) speaking a command (d) a buzz (vibration)
34. 34.⚙️ What number does this app show?
    let bill = 114; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.Which of these is an output? (a) a beep sound (b) checking a password (c) tapping a button (d) typing your age
36. 36.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a buzz (vibration) (d) taking a photo
37. 37.True or false: tapping a button is an input. (a) False (b) True
38. 38.⚙️ What number does this app show?
    let bill = 184; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.True or false: speaking a command is an output. (a) True (b) False
40. 40.Which of these is an output? (a) taking a photo (b) adding up a bill (c) a buzz (vibration) (d) typing your age

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