App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 499 · 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 = 20; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
2. 2.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
3. 3.⚙️ What number does this app show?
   let bill = 290; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.⚙️ 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 4 (b) line 2 (c) line 3 (d) line 1
5. 5.True or false: adding up a bill is processing. (a) True (b) False
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 8; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
7. 7.True or false: tapping a button is an input. (a) True (b) False
8. 8.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
9. 9.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) taking a photo (d) speaking a command
10. 10.True or false: sorting the scores is an input. (a) True (b) False
11. 11.Which of these is an output? (a) typing your age (b) checking a password (c) tapping a button (d) a result on screen
12. 12.True or false: a buzz (vibration) is an output. (a) False (b) True
13. 13.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 3 (b) line 2 (c) line 1 (d) line 4
15. 15.Which of these is processing? (a) taking a photo (b) checking a password (c) tapping a button (d) a beep sound
16. 16.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
18. 18.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 530; // typed by the user
    line 2: let off = 20; // 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
20. 20.Which of these is an input? (a) a beep sound (b) adding up a bill (c) checking a password (d) typing your age
21. 21.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) sorting the scores (d) tapping a button
22. 22.🔍 Which is the odd one out? (a) a pop-up message (b) tapping a button (c) speaking a command (d) taking a photo
23. 23.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
24. 24.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
25. 25.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) checking a password
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
27. 27.Which of these is an output? (a) checking a password (b) speaking a command (c) typing your age (d) a beep sound
28. 28.True or false: tapping a button is processing. (a) False (b) True
29. 29.⚙️ 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
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
31. 31.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.Which of these is an input? (a) speaking a command (b) working out a tip (c) a buzz (vibration) (d) a result on screen
33. 33.True or false: a result on screen is an input. (a) False (b) True
34. 34.True or false: checking a password is processing. (a) False (b) True
35. 35.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ 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 2 (b) line 3 (c) line 1
37. 37.⚙️ 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);
38. 38.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 26; // 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 1 (c) line 2 (d) line 3
40. 40.True or false: taking a photo is an input. (a) True (b) False

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