App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 52 · 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.⚙️ What number does this app show?
   let price = 220; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) speaking a command (d) tapping a button
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 70; // 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 1 (b) line 2 (c) line 3 (d) line 4
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 170; // typed by the user
   line 2: let off = 40; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 3 (b) line 4 (c) line 1 (d) line 2
5. 5.⚙️ What number does this app show?
   let bill = 48; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.True or false: working out a tip is an input. (a) False (b) True
7. 7.Which of these is an input? (a) a beep sound (b) adding up a bill (c) checking a password (d) taking a photo
8. 8.⚙️ What number does this app show?
   let price = 450; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a buzz (vibration) (d) typing your age
10. 10.True or false: checking a password is an input. (a) False (b) True
11. 11.Which of these is processing? (a) sorting the scores (b) tapping a button (c) a buzz (vibration) (d) a beep sound
12. 12.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 300; // 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 2 (b) line 1 (c) line 3 (d) line 4
14. 14.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
15. 15.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
16. 16.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.True or false: typing your age is processing. (a) True (b) False
18. 18.Which of these is processing? (a) taking a photo (b) checking a password (c) a buzz (vibration) (d) a beep sound
19. 19.Which of these is an output? (a) a pop-up message (b) checking a password (c) working out a tip (d) sorting the scores
20. 20.True or false: a beep sound is an output. (a) True (b) False
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 3 (c) line 2 (d) line 1
22. 22.Which of these is an input? (a) checking a password (b) a buzz (vibration) (c) tapping a button (d) a result on screen
23. 23.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 54; // 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 3 (b) line 2 (c) line 1 (d) line 4
25. 25.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
26. 26.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
27. 27.True or false: sorting the scores is an input. (a) False (b) True
28. 28.True or false: sorting the scores is an output. (a) False (b) True
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 4 (c) line 1 (d) line 2
30. 30.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) a buzz (vibration) (d) a result on screen
31. 31.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
32. 32.⚙️ 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 4 (b) line 2 (c) line 3 (d) line 1
33. 33.True or false: tapping a button is processing. (a) False (b) True
34. 34.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) taking a photo (d) tapping a button
36. 36.⚙️ What number does this app show?
    let bill = 116; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.True or false: typing your age is an input. (a) False (b) True
38. 38.True or false: a result on screen is an output. (a) False (b) True
39. 39.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
40. 40.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);

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