App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 290 · 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 adding up a bill an input, processing or an output? (a) processing (b) input (c) output
2. 2.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
3. 3.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
4. 4.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
5. 5.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) checking a password (d) taking a photo
6. 6.True or false: taking a photo is an output. (a) False (b) True
7. 7.Which of these is an output? (a) taking a photo (b) tapping a button (c) a pop-up message (d) typing your age
8. 8.Which of these is processing? (a) a beep sound (b) working out a tip (c) tapping a button (d) a result on screen
9. 9.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
10. 10.Which of these is an input? (a) a buzz (vibration) (b) a beep sound (c) sorting the scores (d) typing your age
11. 11.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
12. 12.True or false: taking a photo is processing. (a) True (b) False
13. 13.Which of these is processing? (a) sorting the scores (b) taking a photo (c) typing your age (d) a result on screen
14. 14.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
15. 15.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) adding up a bill (d) tapping a button
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 2 (b) line 3 (c) line 1 (d) line 4
17. 17.Which of these is processing? (a) taking a photo (b) checking a password (c) speaking a command (d) a result on screen
18. 18.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) typing your age (d) a result on screen
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 550; // 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 3 (b) line 4 (c) line 2 (d) line 1
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 144; // 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 2 (b) line 1 (c) line 4 (d) line 3
21. 21.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
22. 22.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.True or false: checking a password is processing. (a) True (b) False
25. 25.⚙️ What number does this app show?
    let price = 380; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.True or false: sorting the scores is processing. (a) True (b) False
27. 27.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // typed by the user
    line 2: let off = 50; // 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
29. 29.True or false: taking a photo is an input. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) taking a photo (d) a pop-up message
31. 31.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.Which of these is an output? (a) adding up a bill (b) a result on screen (c) sorting the scores (d) taking a photo
33. 33.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
34. 34.⚙️ What number does this app show?
    let bill = 255; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.Which of these is an output? (a) sorting the scores (b) adding up a bill (c) working out a tip (d) a buzz (vibration)
37. 37.Which of these is an input? (a) tapping a button (b) checking a password (c) adding up a bill (d) a pop-up message
38. 38.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 124; // 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 3 (b) line 2 (c) line 1 (d) line 4
40. 40.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a pop-up message (d) sorting the scores

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