App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 697 · 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 bill = 192; // 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
2. 2.⚙️ What number does this app show?
   let km = 5; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
4. 4.⚙️ What number does this app show?
   let bill = 28; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.Which of these is an output? (a) sorting the scores (b) speaking a command (c) a beep sound (d) working out a tip
6. 6.Which of these is processing? (a) a beep sound (b) typing your age (c) working out a tip (d) a result on screen
7. 7.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
8. 8.True or false: a beep sound is an output. (a) False (b) True
9. 9.Which of these is processing? (a) sorting the scores (b) a pop-up message (c) tapping a button (d) a result on screen
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 395; // 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 4 (c) line 2 (d) line 3
11. 11.Which of these is an input? (a) a result on screen (b) a pop-up message (c) tapping a button (d) adding up a bill
12. 12.⚙️ What number does this app show?
    let price = 550; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.⚙️ What number does this app show?
    let bill = 52; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) taking a photo (d) a pop-up message
16. 16.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) tapping a button (d) sorting the scores
17. 17.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
18. 18.Which of these is processing? (a) adding up a bill (b) speaking a command (c) tapping a button (d) a pop-up message
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 510; // typed by the user
    line 2: let off = 20; // 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
20. 20.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.True or false: a beep sound is processing. (a) False (b) True
22. 22.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
23. 23.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
24. 24.Which of these is an output? (a) typing your age (b) working out a tip (c) a pop-up message (d) adding up a bill
25. 25.⚙️ What number does this app show?
    let bill = 171; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) a buzz (vibration)
27. 27.Which of these is an input? (a) a result on screen (b) a pop-up message (c) working out a tip (d) speaking a command
28. 28.⚙️ 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);
29. 29.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
30. 30.True or false: a buzz (vibration) is an output. (a) True (b) False
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // 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 4 (b) line 2 (c) line 1 (d) line 3
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 108; // 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 3 (b) line 1 (c) line 4 (d) line 2
34. 34.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.⚙️ What number does this app show?
    let price = 550; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) checking a password (d) a beep sound
38. 38.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) tapping a button (d) adding up a bill
39. 39.🔍 Which is the odd one out? (a) speaking a command (b) a result on screen (c) a pop-up message (d) a buzz (vibration)
40. 40.Which of these is an input? (a) a pop-up message (b) taking a photo (c) a buzz (vibration) (d) adding up a bill

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