App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 317 · 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 processing? (a) sorting the scores (b) tapping a button (c) a buzz (vibration) (d) taking a photo
2. 2.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
4. 4.Which of these is processing? (a) tapping a button (b) a beep sound (c) a pop-up message (d) adding up a bill
5. 5.Which of these is an input? (a) sorting the scores (b) tapping a button (c) checking a password (d) a beep sound
6. 6.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
8. 8.Which of these is an output? (a) working out a tip (b) adding up a bill (c) a beep sound (d) checking a password
9. 9.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 3 (b) line 2 (c) line 4 (d) line 1
11. 11.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ What number does this app show?
    let bill = 100; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
14. 14.Which of these is processing? (a) tapping a button (b) working out a tip (c) a pop-up message (d) a beep sound
15. 15.True or false: a pop-up message is processing. (a) True (b) False
16. 16.Which of these is an input? (a) a buzz (vibration) (b) sorting the scores (c) taking a photo (d) a pop-up message
17. 17.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) speaking a command (d) a beep sound
18. 18.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a beep sound (d) checking a password
19. 19.True or false: tapping a button is an input. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) a beep sound
21. 21.⚙️ 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 2 (c) line 1
22. 22.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
23. 23.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.⚙️ 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);
25. 25.⚙️ What number does this app show?
    let bill = 132; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // 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 1 (b) line 3 (c) line 4 (d) line 2
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 230; // 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 1 (d) line 4
28. 28.⚙️ 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 3 (b) line 2 (c) line 1
29. 29.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
31. 31.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) adding up a bill
32. 32.Which of these is an input? (a) working out a tip (b) a buzz (vibration) (c) typing your age (d) a pop-up message
33. 33.True or false: sorting the scores is an output. (a) False (b) True
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 22; // 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 2 (b) line 4 (c) line 3 (d) line 1
35. 35.Which of these is an output? (a) a result on screen (b) speaking a command (c) checking a password (d) working out a tip
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 4 (b) line 1 (c) line 2 (d) line 3
37. 37.Which of these is an input? (a) speaking a command (b) a buzz (vibration) (c) sorting the scores (d) a beep sound
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 1 (b) line 2 (c) line 4 (d) line 3
39. 39.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);

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