App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 981 · 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) taking a photo (c) adding up a bill (d) speaking a command
2. 2.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) sorting the scores (d) typing your age
3. 3.🔍 Which is the odd one out? (a) tapping a button (b) sorting the scores (c) working out a tip (d) adding up a bill
4. 4.Which of these is an input? (a) checking a password (b) sorting the scores (c) taking a photo (d) working out a tip
5. 5.🔍 Which is the odd one out? (a) speaking a command (b) sorting the scores (c) tapping a button (d) taking a photo
6. 6.Which of these is processing? (a) a pop-up message (b) working out a tip (c) a result on screen (d) taking a photo
7. 7.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.True or false: adding up a bill is an output. (a) True (b) False
9. 9.Which of these is an input? (a) a beep sound (b) typing your age (c) a buzz (vibration) (d) working out a tip
10. 10.True or false: a pop-up message is processing. (a) True (b) False
11. 11.True or false: typing your age is an input. (a) False (b) True
12. 12.True or false: sorting the scores is an input. (a) True (b) False
13. 13.True or false: a buzz (vibration) is an output. (a) True (b) False
14. 14.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
15. 15.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) speaking a command (d) typing your age
16. 16.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.⚙️ 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 1 (b) line 3 (c) line 2
19. 19.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
20. 20.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.True or false: adding up a bill is processing. (a) True (b) False
22. 22.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
23. 23.True or false: sorting the scores is an output. (a) False (b) True
24. 24.Which of these is an output? (a) a pop-up message (b) tapping a button (c) checking a password (d) speaking a command
25. 25.Which of these is processing? (a) adding up a bill (b) a pop-up message (c) a buzz (vibration) (d) typing your age
26. 26.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
27. 27.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) speaking a command (d) a beep sound
28. 28.True or false: a result on screen is processing. (a) False (b) True
29. 29.Which of these is processing? (a) tapping a button (b) taking a photo (c) sorting the scores (d) a buzz (vibration)
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 line does the processing (works out the answer)?
    line 1: let price = 50; // 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 1 (b) line 3 (c) line 2 (d) line 4
32. 32.True or false: checking a password is processing. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let bill = 308; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.Which of these is an input? (a) adding up a bill (b) tapping a button (c) sorting the scores (d) a beep sound
35. 35.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 150; // 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 4 (c) line 3 (d) line 1
37. 37.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) tapping a button (d) taking a photo
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
39. 39.True or false: checking a password is an output. (a) True (b) False
40. 40.True or false: a beep sound is processing. (a) True (b) False

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