App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 795 · 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 = 232; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.True or false: adding up a bill is processing. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) taking a photo (d) speaking a command
4. 4.Which of these is an output? (a) working out a tip (b) taking a photo (c) a pop-up message (d) typing your age
5. 5.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
6. 6.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
7. 7.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a beep sound (d) adding up a bill
8. 8.Which of these is an input? (a) typing your age (b) working out a tip (c) a buzz (vibration) (d) checking a password
9. 9.⚙️ What number does this app show?
   let km = 2; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.True or false: working out a tip is an input. (a) False (b) True
11. 11.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 42; // 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 2 (b) line 3 (c) line 1 (d) line 4
13. 13.Which of these is processing? (a) taking a photo (b) sorting the scores (c) speaking a command (d) a pop-up message
14. 14.Which of these is an output? (a) checking a password (b) typing your age (c) a result on screen (d) taking a photo
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 3 (c) line 4 (d) line 2
16. 16.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a result on screen (d) taking a photo
17. 17.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.⚙️ 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 3 (b) line 2 (c) line 1
20. 20.True or false: taking a photo is an input. (a) True (b) False
21. 21.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
22. 22.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) working out a tip (d) speaking a command
23. 23.Which of these is an output? (a) taking a photo (b) adding up a bill (c) checking a password (d) a buzz (vibration)
24. 24.Which of these is an input? (a) speaking a command (b) sorting the scores (c) a beep sound (d) a result on screen
25. 25.True or false: a result on screen is an input. (a) False (b) True
26. 26.⚙️ What number does this app show?
    let bill = 316; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
29. 29.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
30. 30.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.True or false: checking a password is processing. (a) False (b) True
32. 32.Which of these is an input? (a) taking a photo (b) a result on screen (c) adding up a bill (d) sorting the scores
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 430; // 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 4 (b) line 1 (c) line 3 (d) line 2
34. 34.True or false: a beep sound is an output. (a) False (b) True
35. 35.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.True or false: working out a tip is processing. (a) True (b) False
37. 37.⚙️ 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);
38. 38.True or false: tapping a button is processing. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) tapping a button (d) checking a password
40. 40.True or false: typing your age is an output. (a) True (b) False

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