App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 63 · 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 line does the processing (works out the answer)?
   line 1: let price = 40; // 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 4 (b) line 3 (c) line 2 (d) line 1
3. 3.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
4. 4.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) typing your age (d) speaking a command
5. 5.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // 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 2 (b) line 4 (c) line 3 (d) line 1
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 250; // 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 1 (b) line 4 (c) line 2 (d) line 3
8. 8.True or false: taking a photo is an input. (a) False (b) True
9. 9.True or false: adding up a bill is processing. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) checking a password (d) a pop-up message
11. 11.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
12. 12.True or false: a beep sound is an input. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) a pop-up message (d) a buzz (vibration)
14. 14.⚙️ 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 3 (b) line 4 (c) line 1 (d) line 2
15. 15.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.Which of these is processing? (a) taking a photo (b) a beep sound (c) a buzz (vibration) (d) working out a tip
17. 17.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.True or false: typing your age is an input. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let price = 380; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.⚙️ 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 2 (b) line 3 (c) line 1
21. 21.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
22. 22.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) typing your age (d) checking a password
23. 23.Which of these is an output? (a) adding up a bill (b) tapping a button (c) taking a photo (d) a beep sound
24. 24.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
25. 25.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
26. 26.True or false: a pop-up message is processing. (a) True (b) False
27. 27.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) working out a tip (d) a beep sound
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
30. 30.⚙️ What number does this app show?
    let bill = 60; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 160; // 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 2 (b) line 4 (c) line 1 (d) line 3
32. 32.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
33. 33.⚙️ What number does this app show?
    let bill = 60; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 280; // 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 1 (b) line 3 (c) line 2 (d) line 4
35. 35.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a buzz (vibration) (d) speaking a command
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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
37. 37.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.True or false: tapping a button is an output. (a) False (b) True
39. 39.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) typing your age (d) working out a tip

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