App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 462 · 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 bill = 128; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 272; // 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
3. 3.⚙️ What number does this app show?
   let km = 14; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ What number does this app show?
   let price = 270; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.⚙️ What number does this app show?
   let bill = 228; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
8. 8.True or false: typing your age is an input. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) sorting the scores (d) working out a tip
10. 10.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a buzz (vibration) (d) typing your age
11. 11.True or false: taking a photo is processing. (a) False (b) True
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 216; // 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 3 (c) line 2 (d) line 1
13. 13.🔍 Which is the odd one out? (a) speaking a command (b) a result on screen (c) taking a photo (d) tapping a button
14. 14.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
15. 15.Which of these is an output? (a) a buzz (vibration) (b) typing your age (c) sorting the scores (d) checking a password
16. 16.True or false: a buzz (vibration) is an input. (a) False (b) True
17. 17.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 63; // 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 2 (b) line 4 (c) line 1 (d) line 3
19. 19.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) tapping a button
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 560; // 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 3 (c) line 4 (d) line 2
21. 21.⚙️ What number does this app show?
    let bill = 365; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.⚙️ What number does this app show?
    let bill = 310; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.True or false: a beep sound is processing. (a) True (b) False
24. 24.True or false: a beep sound is an output. (a) True (b) False
25. 25.True or false: checking a password is an output. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
27. 27.True or false: a result on screen is an output. (a) True (b) False
28. 28.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
29. 29.Which of these is an input? (a) speaking a command (b) a beep sound (c) a result on screen (d) a buzz (vibration)
30. 30.True or false: adding up a bill is an input. (a) True (b) False
31. 31.Which of these is an output? (a) checking a password (b) a pop-up message (c) speaking a command (d) taking a photo
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 136; // 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 4 (c) line 1 (d) line 2
33. 33.True or false: taking a photo is an input. (a) False (b) True
34. 34.True or false: a pop-up message is an input. (a) False (b) True
35. 35.Which of these is an input? (a) typing your age (b) working out a tip (c) a beep sound (d) checking a password
36. 36.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
38. 38.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ What number does this app show?
    let bill = 75; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // typed by the user
    line 2: let off = 50; // 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

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