App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 19 · 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 = 28; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
3. 3.⚙️ What number does this app show?
   let price = 260; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 70; // 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 4 (d) line 3
5. 5.Which of these is an input? (a) checking a password (b) a beep sound (c) sorting the scores (d) taking a photo
6. 6.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) tapping a button (d) working out a tip
7. 7.Which of these is an input? (a) a beep sound (b) a result on screen (c) typing your age (d) a buzz (vibration)
8. 8.⚙️ 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);
9. 9.True or false: sorting the scores is processing. (a) False (b) True
10. 10.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
11. 11.Which of these is an output? (a) adding up a bill (b) a result on screen (c) tapping a button (d) speaking a command
12. 12.Which of these is processing? (a) a buzz (vibration) (b) a pop-up message (c) taking a photo (d) adding up a bill
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 3 (b) line 1 (c) line 4 (d) line 2
14. 14.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
15. 15.🔍 Which is the odd one out? (a) a beep sound (b) sorting the scores (c) a result on screen (d) a buzz (vibration)
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
17. 17.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) working out a tip
18. 18.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) a result on screen (d) checking a password
19. 19.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
20. 20.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
21. 21.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 3 (b) line 1 (c) line 2 (d) line 4
24. 24.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) a pop-up message
25. 25.Which of these is an output? (a) speaking a command (b) a buzz (vibration) (c) adding up a bill (d) sorting the scores
26. 26.⚙️ 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 1 (b) line 3 (c) line 2
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 3 (b) line 1 (c) line 4 (d) line 2
28. 28.True or false: a pop-up message is an output. (a) True (b) False
29. 29.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.Which of these is processing? (a) sorting the scores (b) typing your age (c) a buzz (vibration) (d) taking a photo
31. 31.Which of these is an output? (a) a beep sound (b) taking a photo (c) adding up a bill (d) typing your age
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 1 (d) line 2
33. 33.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.Which of these is an input? (a) adding up a bill (b) checking a password (c) speaking a command (d) sorting the scores
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 44; // 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 2 (b) line 3 (c) line 1 (d) line 4
36. 36.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.True or false: typing your age is an output. (a) True (b) False
38. 38.⚙️ What number does this app show?
    let bill = 292; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
40. 40.⚙️ What number does this app show?
    let bill = 116; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);

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