App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 691 · 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.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
2. 2.⚙️ What number does this app show?
   let price = 65; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
3. 3.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) taking a photo (d) a buzz (vibration)
4. 4.Which of these is processing? (a) taking a photo (b) a pop-up message (c) a result on screen (d) working out a tip
5. 5.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
6. 6.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 380; // 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 3 (b) line 4 (c) line 1 (d) line 2
8. 8.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
9. 9.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) tapping a button (d) typing your age
10. 10.True or false: working out a tip is an output. (a) False (b) True
11. 11.Which of these is processing? (a) speaking a command (b) a pop-up message (c) taking a photo (d) sorting the scores
12. 12.True or false: checking a password is processing. (a) False (b) True
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 115; // 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 2 (c) line 4 (d) line 3
14. 14.True or false: typing your age is an output. (a) True (b) False
15. 15.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ What number does this app show?
    let price = 120; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 3 (b) line 1 (c) line 2 (d) line 4
18. 18.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
19. 19.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
20. 20.Which of these is an input? (a) speaking a command (b) working out a tip (c) adding up a bill (d) sorting the scores
21. 21.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a pop-up message (d) checking a password
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 1 (d) line 3
23. 23.True or false: a result on screen is an input. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) adding up a bill (b) a result on screen (c) a beep sound (d) a buzz (vibration)
25. 25.Which of these is an input? (a) checking a password (b) a result on screen (c) adding up a bill (d) taking a photo
26. 26.⚙️ What number does this app show?
    let bill = 216; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.True or false: a pop-up message is an output. (a) False (b) True
28. 28.Which of these is an output? (a) a buzz (vibration) (b) adding up a bill (c) sorting the scores (d) tapping a button
29. 29.True or false: tapping a button is an input. (a) False (b) True
30. 30.⚙️ 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 3 (b) line 2 (c) line 1
31. 31.Which of these is processing? (a) a pop-up message (b) adding up a bill (c) a buzz (vibration) (d) tapping a button
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 4 (b) line 3 (c) line 2 (d) line 1
33. 33.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.True or false: speaking a command is an input. (a) True (b) False
35. 35.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) tapping a button (d) working out a tip
37. 37.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
38. 38.🔍 Which is the odd one out? (a) a result on screen (b) checking a password (c) adding up a bill (d) working out a tip
39. 39.⚙️ What number does this app show?
    let bill = 126; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);

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