App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 189 · 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.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 234; // 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 1 (b) line 4 (c) line 3 (d) line 2
2. 2.⚙️ What number does this app show?
   let bill = 225; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.Which of these is an output? (a) tapping a button (b) a beep sound (c) adding up a bill (d) typing your age
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 12; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
5. 5.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
6. 6.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 296; // 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 3 (b) line 4 (c) line 2 (d) line 1
8. 8.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) typing your age (d) a buzz (vibration)
9. 9.⚙️ What number does this app show?
   let km = 2; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.True or false: speaking a command is an output. (a) True (b) False
11. 11.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
12. 12.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
13. 13.True or false: typing your age is an input. (a) False (b) True
14. 14.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
15. 15.🔍 Which is the odd one out? (a) a buzz (vibration) (b) working out a tip (c) checking a password (d) adding up a bill
16. 16.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
17. 17.⚙️ 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 3 (b) line 2 (c) line 1
18. 18.Which of these is an input? (a) a result on screen (b) adding up a bill (c) a buzz (vibration) (d) tapping a button
19. 19.⚙️ What number does this app show?
    let bill = 136; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
21. 21.Which of these is processing? (a) a beep sound (b) checking a password (c) tapping a button (d) a result on screen
22. 22.True or false: sorting the scores is processing. (a) True (b) False
23. 23.⚙️ What number does this app show?
    let bill = 272; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 1 (c) line 2 (d) line 4
25. 25.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.True or false: a result on screen is processing. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 4 (b) line 1 (c) line 3 (d) line 2
28. 28.🔍 Which is the odd one out? (a) a beep sound (b) sorting the scores (c) a pop-up message (d) a result on screen
29. 29.⚙️ What number does this app show?
    let bill = 360; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
32. 32.Which of these is processing? (a) speaking a command (b) a pop-up message (c) adding up a bill (d) a result on screen
33. 33.True or false: typing your age is processing. (a) False (b) True
34. 34.Which of these is an input? (a) a result on screen (b) working out a tip (c) typing your age (d) adding up a bill
35. 35.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) working out a tip (d) speaking a command
36. 36.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.Which of these is an input? (a) speaking a command (b) adding up a bill (c) a beep sound (d) working out a tip
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 420; // 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
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 100; // 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 4 (b) line 3 (c) line 2 (d) line 1
40. 40.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing

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