App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 10 · 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: working out a tip is processing. (a) True (b) False
2. 2.Which of these is processing? (a) adding up a bill (b) a result on screen (c) taking a photo (d) tapping a button
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 95; // 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 4 (c) line 3 (d) line 2
4. 4.⚙️ What number does this app show?
   let bill = 48; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ What number does this app show?
   let bill = 260; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) tapping a button (d) taking a photo
7. 7.True or false: sorting the scores is processing. (a) True (b) False
8. 8.True or false: a buzz (vibration) is processing. (a) True (b) False
9. 9.True or false: a pop-up message is an input. (a) False (b) True
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 2 (b) line 1 (c) line 3 (d) line 4
11. 11.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
12. 12.⚙️ 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 2 (c) line 4 (d) line 3
13. 13.⚙️ What number does this app show?
    let bill = 138; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 400; // 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 3 (c) line 4 (d) line 1
15. 15.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a pop-up message (d) sorting the scores
16. 16.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
17. 17.True or false: sorting the scores is an input. (a) True (b) False
18. 18.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
20. 20.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.True or false: tapping a button is an output. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) working out a tip (b) a buzz (vibration) (c) a beep sound (d) a result on screen
23. 23.Which of these is an input? (a) sorting the scores (b) a beep sound (c) taking a photo (d) a result on screen
24. 24.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
25. 25.Which of these is an output? (a) typing your age (b) tapping a button (c) taking a photo (d) a beep sound
26. 26.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
27. 27.Which of these is an output? (a) typing your age (b) a result on screen (c) checking a password (d) speaking a command
28. 28.🔍 Which is the odd one out? (a) taking a photo (b) a pop-up message (c) a result on screen (d) a beep sound
29. 29.Which of these is an input? (a) a pop-up message (b) a beep sound (c) a buzz (vibration) (d) tapping a button
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 2 (b) line 3 (c) line 4 (d) line 1
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 60; // 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 2 (c) line 3 (d) line 4
32. 32.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 480; // typed by the user
    line 2: let off = 30; // 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
35. 35.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) typing your age (d) checking a password
36. 36.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.True or false: a buzz (vibration) is an input. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) a buzz (vibration)
39. 39.True or false: typing your age is an input. (a) True (b) False
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 1 (b) line 2 (c) line 4 (d) line 3

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