App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 886 · 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 of these is an input? (a) a buzz (vibration) (b) typing your age (c) a result on screen (d) checking a password
2. 2.⚙️ What number does this app show?
   let bill = 48; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.True or false: sorting the scores is an input. (a) False (b) True
4. 4.True or false: typing your age is an output. (a) False (b) True
5. 5.Which of these is an output? (a) taking a photo (b) sorting the scores (c) typing your age (d) a beep sound
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 174; // 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 1 (d) line 3
7. 7.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) checking a password (d) typing your age
8. 8.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 50; // 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
10. 10.⚙️ What number does this app show?
    let bill = 174; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.⚙️ What number does this app show?
    let bill = 115; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.True or false: checking a password is an input. (a) True (b) False
13. 13.⚙️ 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 2 (b) line 1 (c) line 4 (d) line 3
14. 14.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) a pop-up message (d) tapping a button
15. 15.Which of these is processing? (a) taking a photo (b) a pop-up message (c) a beep sound (d) checking a password
16. 16.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) checking a password (d) taking a photo
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 300; // 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
18. 18.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a buzz (vibration) (d) adding up a bill
19. 19.Which of these is an input? (a) a buzz (vibration) (b) a result on screen (c) speaking a command (d) a pop-up message
20. 20.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 4 (b) line 3 (c) line 2 (d) line 1
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) sorting the scores
23. 23.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) adding up a bill (d) working out a tip
24. 24.Which of these is processing? (a) typing your age (b) a beep sound (c) speaking a command (d) adding up a bill
25. 25.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
26. 26.True or false: taking a photo is processing. (a) True (b) False
27. 27.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
28. 28.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) working out a tip
29. 29.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // 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 2 (d) line 4
31. 31.Which of these is an output? (a) working out a tip (b) tapping a button (c) speaking a command (d) a result on screen
32. 32.🔍 Which is the odd one out? (a) typing your age (b) a buzz (vibration) (c) tapping a button (d) speaking a command
33. 33.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
34. 34.⚙️ 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 1 (c) line 2
35. 35.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 3 (b) line 4 (c) line 2 (d) line 1
37. 37.Which of these is an output? (a) adding up a bill (b) speaking a command (c) taking a photo (d) a buzz (vibration)
38. 38.Which of these is an input? (a) a beep sound (b) tapping a button (c) adding up a bill (d) a buzz (vibration)
39. 39.⚙️ What number does this app show?
    let price = 480; // 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) a beep sound (b) typing your age (c) tapping a button (d) taking a photo

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