App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 101 · 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.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
2. 2.⚙️ What number does this app show?
   let price = 440; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.True or false: tapping a button is an input. (a) True (b) False
4. 4.Which of these is an input? (a) working out a tip (b) taking a photo (c) sorting the scores (d) adding up a bill
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 line does the processing (works out the answer)?
   line 1: let price = 430; // 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
7. 7.Which of these is processing? (a) typing your age (b) tapping a button (c) taking a photo (d) working out a tip
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 75; // typed by the user
   line 2: let qty = 4; // 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
9. 9.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
10. 10.Which of these is an output? (a) working out a tip (b) typing your age (c) a pop-up message (d) taking a photo
11. 11.True or false: a pop-up message is processing. (a) False (b) True
12. 12.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) sorting the scores (d) a pop-up message
13. 13.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) typing your age (d) sorting the scores
14. 14.⚙️ 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 1 (b) line 3 (c) line 2
15. 15.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) checking a password
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 3 (c) line 4 (d) line 2
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 4 (c) line 1 (d) line 2
18. 18.🔍 Which is the odd one out? (a) working out a tip (b) speaking a command (c) taking a photo (d) tapping a button
19. 19.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
20. 20.True or false: typing your age is an input. (a) False (b) True
21. 21.Which of these is an output? (a) a result on screen (b) working out a tip (c) taking a photo (d) sorting the scores
22. 22.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) speaking a command (d) a pop-up message
23. 23.🔍 Which is the odd one out? (a) adding up a bill (b) a buzz (vibration) (c) working out a tip (d) sorting the scores
24. 24.🔍 Which is the odd one out? (a) adding up a bill (b) a result on screen (c) checking a password (d) working out a tip
25. 25.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a buzz (vibration) (d) tapping a button
26. 26.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ What number does this app show?
    let price = 580; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
29. 29.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 360; // 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 4 (c) line 1 (d) line 2
31. 31.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a beep sound (d) working out a tip
34. 34.True or false: sorting the scores is processing. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) working out a tip (d) taking a photo
36. 36.Which of these is an input? (a) a pop-up message (b) sorting the scores (c) a result on screen (d) tapping a button
37. 37.⚙️ What number does this app show?
    let bill = 68; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
39. 39.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
40. 40.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) adding up a bill

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