App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 477 · 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 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
2. 2.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ 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 1 (b) line 3 (c) line 2
4. 4.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) working out a tip (d) taking a photo
5. 5.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
6. 6.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) checking a password
7. 7.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) working out a tip (d) a result on screen
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 460; // 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 3 (d) line 4
9. 9.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
10. 10.⚙️ What number does this app show?
    let bill = 148; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.Which of these is processing? (a) a beep sound (b) tapping a button (c) sorting the scores (d) a pop-up message
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 2; // 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
13. 13.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.Which of these is an output? (a) typing your age (b) a pop-up message (c) tapping a button (d) working out a tip
15. 15.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
16. 16.🔍 Which is the odd one out? (a) tapping a button (b) working out a tip (c) sorting the scores (d) adding up a bill
17. 17.True or false: working out a tip is an input. (a) False (b) True
18. 18.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
19. 19.True or false: a result on screen is processing. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) working out a tip (d) adding up a bill
21. 21.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
22. 22.True or false: working out a tip is processing. (a) True (b) False
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 4 (b) line 2 (c) line 3 (d) line 1
24. 24.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) adding up a bill (d) checking a password
25. 25.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
26. 26.True or false: checking a password is processing. (a) True (b) False
27. 27.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.⚙️ What number does this app show?
    let bill = 154; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 60; // 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
30. 30.Which of these is processing? (a) checking a password (b) a result on screen (c) speaking a command (d) a beep sound
31. 31.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 3 (b) line 2 (c) line 1 (d) line 4
34. 34.True or false: tapping a button is an input. (a) False (b) True
35. 35.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ What number does this app show?
    let price = 530; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.Which of these is an output? (a) a result on screen (b) typing your age (c) adding up a bill (d) sorting the scores
40. 40.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output

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