App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 292 · 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 is the odd one out? (a) a beep sound (b) a result on screen (c) adding up a bill (d) a buzz (vibration)
2. 2.True or false: tapping a button is an output. (a) True (b) False
3. 3.⚙️ What number does this app show?
   let price = 15; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
4. 4.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a pop-up message
5. 5.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) speaking a command (d) taking a photo
6. 6.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 250; // 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 4 (b) line 1 (c) line 2 (d) line 3
8. 8.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.⚙️ What number does this app show?
   let km = 13; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.⚙️ What number does this app show?
    let price = 530; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.True or false: working out a tip is processing. (a) False (b) True
12. 12.Which of these is processing? (a) a result on screen (b) tapping a button (c) sorting the scores (d) typing your age
13. 13.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) tapping a button (d) checking a password
14. 14.⚙️ 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);
15. 15.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.⚙️ What number does this app show?
    let price = 580; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
18. 18.True or false: sorting the scores is processing. (a) True (b) False
19. 19.⚙️ 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);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
21. 21.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
22. 22.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
24. 24.True or false: tapping a button is an input. (a) False (b) True
25. 25.Which of these is an input? (a) checking a password (b) speaking a command (c) sorting the scores (d) a result on screen
26. 26.Which of these is processing? (a) tapping a button (b) a result on screen (c) adding up a bill (d) typing your age
27. 27.Which of these is an output? (a) working out a tip (b) speaking a command (c) a buzz (vibration) (d) adding up a bill
28. 28.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.Which of these is an output? (a) typing your age (b) a pop-up message (c) working out a tip (d) taking a photo
30. 30.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 1 (b) line 2 (c) line 3 (d) line 4
32. 32.🔍 Which is the odd one out? (a) typing your age (b) working out a tip (c) tapping a button (d) speaking a command
33. 33.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) adding up a bill (d) working out a tip
34. 34.True or false: tapping a button is processing. (a) False (b) True
35. 35.Which of these is processing? (a) taking a photo (b) working out a tip (c) typing your age (d) speaking a command
36. 36.True or false: a result on screen is an output. (a) False (b) True
37. 37.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
38. 38.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 2 (c) line 4 (d) line 1
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 304; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 3 (c) line 2 (d) line 4

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