App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 139 · 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 a beep sound an input, processing or an output? (a) input (b) processing (c) output
2. 2.⚙️ 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);
3. 3.⚙️ What number does this app show?
   let bill = 213; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.True or false: adding up a bill is processing. (a) False (b) True
5. 5.Which of these is an input? (a) adding up a bill (b) tapping a button (c) sorting the scores (d) a buzz (vibration)
6. 6.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) typing your age (d) a beep sound
8. 8.True or false: adding up a bill is an input. (a) True (b) False
9. 9.⚙️ 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 1 (b) line 2 (c) line 3
10. 10.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) adding up a bill
11. 11.True or false: tapping a button is an input. (a) False (b) True
12. 12.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
13. 13.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) speaking a command (d) sorting the scores
14. 14.True or false: a buzz (vibration) is an input. (a) False (b) True
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 99; // 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 1 (c) line 2 (d) line 3
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 296; // 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 3 (b) line 4 (c) line 1 (d) line 2
17. 17.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
18. 18.True or false: sorting the scores is an input. (a) False (b) True
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 132; // 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 4 (b) line 1 (c) line 2 (d) line 3
20. 20.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a buzz (vibration) (d) taking a photo
21. 21.True or false: a pop-up message is an output. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) typing your age (d) speaking a command
23. 23.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
24. 24.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
26. 26.True or false: working out a tip is processing. (a) False (b) True
27. 27.Which of these is an input? (a) working out a tip (b) checking a password (c) a beep sound (d) typing your age
28. 28.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
30. 30.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
31. 31.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
32. 32.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) a pop-up message (d) checking a password
33. 33.True or false: speaking a command is an input. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) tapping a button
35. 35.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) a beep sound (d) typing your age
36. 36.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
38. 38.True or false: a beep sound is an input. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 90; // 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
40. 40.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output

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