App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 278 · 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) typing your age (b) working out a tip (c) tapping a button (d) a pop-up message
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 3; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
3. 3.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
4. 4.⚙️ What number does this app show?
   let bill = 168; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.True or false: a pop-up message is an output. (a) True (b) False
6. 6.⚙️ What number does this app show?
   let price = 250; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.True or false: typing your age is an input. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) working out a tip (b) tapping a button (c) speaking a command (d) typing your age
9. 9.⚙️ What number does this app show?
   let km = 8; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) working out a tip (d) sorting the scores
12. 12.Which of these is processing? (a) adding up a bill (b) taking a photo (c) tapping a button (d) speaking a command
13. 13.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a pop-up message (d) tapping a button
14. 14.Which of these is an input? (a) checking a password (b) a result on screen (c) speaking a command (d) working out a tip
15. 15.⚙️ 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 4 (c) line 2 (d) line 3
16. 16.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
17. 17.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
18. 18.True or false: sorting the scores is an input. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) a beep sound (d) typing your age
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // 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 3 (b) line 1 (c) line 4 (d) line 2
21. 21.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
22. 22.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) a buzz (vibration) (d) typing your age
23. 23.Which of these is processing? (a) a beep sound (b) typing your age (c) working out a tip (d) tapping a button
24. 24.Which of these is an output? (a) tapping a button (b) a result on screen (c) adding up a bill (d) typing your age
25. 25.True or false: tapping a button is processing. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
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 3 (b) line 1 (c) line 2
28. 28.⚙️ What number does this app show?
    let bill = 66; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.Which of these is an output? (a) tapping a button (b) speaking a command (c) a beep sound (d) adding up a bill
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 215; // 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 2 (c) line 4 (d) line 1
31. 31.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 57; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 2 (c) line 4 (d) line 3
33. 33.🔍 Which is the odd one out? (a) speaking a command (b) working out a tip (c) checking a password (d) sorting the scores
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
35. 35.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
36. 36.Which of these is an input? (a) a buzz (vibration) (b) tapping a button (c) adding up a bill (d) a pop-up message
37. 37.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
39. 39.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // 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 3 (b) line 1 (c) line 4 (d) line 2

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