App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 724 · 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 input? (a) speaking a command (b) a buzz (vibration) (c) a result on screen (d) a beep sound
2. 2.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
3. 3.⚙️ 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);
4. 4.⚙️ 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 2 (b) line 1 (c) line 3
5. 5.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 470; // 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 4 (b) line 2 (c) line 3 (d) line 1
7. 7.Which of these is processing? (a) a beep sound (b) speaking a command (c) checking a password (d) a result on screen
8. 8.⚙️ 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 3 (c) line 1
9. 9.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
10. 10.⚙️ What number does this app show?
    let bill = 75; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) checking a password (d) adding up a bill
12. 12.Which of these is an output? (a) taking a photo (b) a result on screen (c) checking a password (d) sorting the scores
13. 13.🔍 Which is the odd one out? (a) a buzz (vibration) (b) typing your age (c) tapping a button (d) taking a photo
14. 14.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
15. 15.⚙️ 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 3 (b) line 1 (c) line 4 (d) line 2
16. 16.Which of these is an output? (a) taking a photo (b) a buzz (vibration) (c) working out a tip (d) sorting the scores
17. 17.Which of these is an output? (a) typing your age (b) a pop-up message (c) tapping a button (d) adding up a bill
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 50; // 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 1 (b) line 2 (c) line 3 (d) line 4
19. 19.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
20. 20.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) a pop-up message (d) a beep sound
21. 21.True or false: a pop-up message is an output. (a) False (b) True
22. 22.True or false: tapping a button is an input. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) a result on screen (b) checking a password (c) sorting the scores (d) working out a tip
24. 24.⚙️ What number does this app show?
    let bill = 325; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.Which of these is an output? (a) adding up a bill (b) tapping a button (c) a beep sound (d) working out a tip
28. 28.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) sorting the scores (d) working out a tip
29. 29.Which of these is an input? (a) taking a photo (b) checking a password (c) a buzz (vibration) (d) a pop-up message
30. 30.True or false: sorting the scores is processing. (a) True (b) False
31. 31.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
33. 33.True or false: a buzz (vibration) is an output. (a) False (b) True
34. 34.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.⚙️ What number does this app show?
    let bill = 245; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) a pop-up message (d) adding up a bill
38. 38.True or false: adding up a bill is an input. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 590; // 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 4 (b) line 2 (c) line 1 (d) line 3
40. 40.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) sorting the scores

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