App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 310 · 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.True or false: tapping a button is an input. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.Which of these is processing? (a) a buzz (vibration) (b) tapping a button (c) taking a photo (d) checking a password
4. 4.Which of these is an input? (a) tapping a button (b) sorting the scores (c) working out a tip (d) a beep sound
5. 5.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
6. 6.True or false: a buzz (vibration) is an output. (a) False (b) True
7. 7.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.True or false: a buzz (vibration) is an input. (a) False (b) True
9. 9.True or false: adding up a bill is an input. (a) False (b) True
10. 10.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
11. 11.Which of these is an input? (a) checking a password (b) a beep sound (c) adding up a bill (d) typing your age
12. 12.Which of these is an output? (a) taking a photo (b) speaking a command (c) working out a tip (d) a result on screen
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 44; // 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 1 (b) line 3 (c) line 4 (d) line 2
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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
15. 15.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 240; // 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 4 (c) line 3 (d) line 2
17. 17.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) speaking a command (d) sorting the scores
19. 19.Which of these is processing? (a) sorting the scores (b) a pop-up message (c) taking a photo (d) tapping a button
20. 20.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) sorting the scores (d) a buzz (vibration)
21. 21.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
22. 22.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
23. 23.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) checking a password (d) typing your age
24. 24.Which of these is processing? (a) a buzz (vibration) (b) taking a photo (c) adding up a bill (d) a beep sound
25. 25.True or false: taking a photo is an input. (a) True (b) False
26. 26.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 164; // 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 1 (b) line 4 (c) line 2 (d) line 3
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // 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.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 540; // 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 4 (c) line 3 (d) line 1
30. 30.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
31. 31.True or false: tapping a button is an output. (a) True (b) False
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 1 (d) line 3
33. 33.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.⚙️ 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);
35. 35.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
38. 38.Which of these is an output? (a) checking a password (b) tapping a button (c) a pop-up message (d) typing your age
39. 39.True or false: speaking a command is an output. (a) False (b) True
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1

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