App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 833 · 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 km = 13; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
2. 2.⚙️ 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);
3. 3.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a buzz (vibration) (d) taking a photo
4. 4.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
5. 5.⚙️ What number does this app show?
   let price = 420; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) checking a password (d) sorting the scores
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 480; // 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 2 (b) line 1 (c) line 3 (d) line 4
8. 8.True or false: a pop-up message is an input. (a) True (b) False
9. 9.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
10. 10.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a beep sound (d) typing your age
11. 11.True or false: checking a password is processing. (a) True (b) False
12. 12.True or false: a pop-up message is processing. (a) True (b) False
13. 13.True or false: a beep sound is an output. (a) False (b) True
14. 14.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
15. 15.True or false: tapping a button is an input. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) adding up a bill (d) a pop-up message
17. 17.Which of these is an output? (a) working out a tip (b) sorting the scores (c) typing your age (d) a beep sound
18. 18.Which of these is processing? (a) sorting the scores (b) typing your age (c) a beep sound (d) tapping a button
19. 19.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) checking a password (d) speaking a command
20. 20.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) typing your age (d) sorting the scores
21. 21.⚙️ What number does this app show?
    let price = 570; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.True or false: working out a tip is an input. (a) False (b) True
23. 23.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
24. 24.⚙️ What number does this app show?
    let bill = 22; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 2 (b) line 4 (c) line 1 (d) line 3
28. 28.⚙️ 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 2 (b) line 4 (c) line 1 (d) line 3
29. 29.⚙️ 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 1 (c) line 3 (d) line 4
30. 30.⚙️ 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 2 (b) line 3 (c) line 1
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 50; // 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 3 (b) line 4 (c) line 2 (d) line 1
32. 32.True or false: typing your age is processing. (a) True (b) False
33. 33.True or false: speaking a command is processing. (a) False (b) True
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 1 (b) line 3 (c) line 2 (d) line 4
35. 35.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
36. 36.Which of these is an input? (a) speaking a command (b) a buzz (vibration) (c) adding up a bill (d) checking a password
37. 37.True or false: tapping a button is processing. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) a result on screen (b) sorting the scores (c) working out a tip (d) adding up a bill
39. 39.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.True or false: sorting the scores is processing. (a) True (b) False

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