App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 411 · 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 of these is an output? (a) checking a password (b) tapping a button (c) a buzz (vibration) (d) sorting the scores
2. 2.Which of these is an input? (a) checking a password (b) working out a tip (c) a beep sound (d) tapping a button
3. 3.Which of these is an output? (a) typing your age (b) speaking a command (c) a beep sound (d) taking a photo
4. 4.⚙️ What number does this app show?
   let price = 55; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
5. 5.Which of these is an output? (a) working out a tip (b) a result on screen (c) checking a password (d) tapping a button
6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
7. 7.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) taking a photo (d) sorting the scores
8. 8.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 65; // 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 2 (c) line 1 (d) line 4
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 340; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 1 (c) line 3 (d) line 2
11. 11.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
12. 12.Which of these is an input? (a) speaking a command (b) a beep sound (c) a pop-up message (d) a buzz (vibration)
13. 13.True or false: a buzz (vibration) is an output. (a) False (b) True
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 550; // 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 2 (b) line 1 (c) line 4 (d) line 3
15. 15.Which of these is an input? (a) sorting the scores (b) typing your age (c) checking a password (d) adding up a bill
16. 16.🔍 Which is the odd one out? (a) working out a tip (b) tapping a button (c) typing your age (d) taking a photo
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
18. 18.⚙️ What number does this app show?
    let price = 490; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.Which of these is processing? (a) a pop-up message (b) taking a photo (c) adding up a bill (d) tapping a button
20. 20.⚙️ What number does this app show?
    let bill = 385; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.⚙️ 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);
22. 22.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) checking a password
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 155; // 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 3 (b) line 1 (c) line 4 (d) line 2
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 1 (c) line 2 (d) line 3
25. 25.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
26. 26.Which of these is processing? (a) a pop-up message (b) working out a tip (c) typing your age (d) taking a photo
27. 27.⚙️ 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 1 (b) line 2 (c) line 3
28. 28.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) tapping a button
29. 29.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.True or false: a buzz (vibration) is processing. (a) True (b) False
31. 31.True or false: a result on screen is processing. (a) True (b) False
32. 32.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) typing your age (d) tapping a button
34. 34.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) typing your age (d) working out a tip
35. 35.True or false: taking a photo is an input. (a) False (b) True
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 176; // 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 4 (b) line 1 (c) line 3 (d) line 2
37. 37.True or false: checking a password is an input. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) adding up a bill (d) a pop-up message
39. 39.Which of these is an input? (a) a beep sound (b) a pop-up message (c) taking a photo (d) a buzz (vibration)
40. 40.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output

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