App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 421 · 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 pop-up message an input, processing or an output? (a) output (b) processing (c) input
2. 2.Which of these is processing? (a) working out a tip (b) typing your age (c) speaking a command (d) a buzz (vibration)
3. 3.True or false: speaking a command is processing. (a) False (b) True
4. 4.⚙️ What number does this app show?
   let bill = 204; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.True or false: checking a password is an output. (a) True (b) False
6. 6.Which of these is an output? (a) speaking a command (b) typing your age (c) a result on screen (d) working out a tip
7. 7.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) tapping a button (d) typing your age
8. 8.🔍 Which is the odd one out? (a) a beep sound (b) tapping a button (c) speaking a command (d) taking a photo
9. 9.⚙️ What number does this app show?
   let bill = 276; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.True or false: taking a photo is processing. (a) True (b) False
11. 11.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
12. 12.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
13. 13.True or false: working out a tip is an input. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) speaking a command (b) working out a tip (c) typing your age (d) tapping a button
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 138; // 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 3 (b) line 1 (c) line 2 (d) line 4
16. 16.Which of these is an input? (a) checking a password (b) a result on screen (c) typing your age (d) adding up a bill
17. 17.Which of these is an input? (a) adding up a bill (b) a result on screen (c) working out a tip (d) tapping a button
18. 18.True or false: tapping a button is processing. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 1 (b) line 4 (c) line 2 (d) line 3
22. 22.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
23. 23.True or false: a buzz (vibration) is an output. (a) False (b) True
24. 24.True or false: typing your age is processing. (a) True (b) False
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 3 (c) line 1 (d) line 2
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 3 (b) line 2 (c) line 1
27. 27.True or false: a pop-up message is processing. (a) False (b) True
28. 28.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
29. 29.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
31. 31.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) a pop-up message
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
33. 33.True or false: typing your age is an input. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) speaking a command (d) sorting the scores
35. 35.True or false: a result on screen is processing. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) a buzz (vibration) (d) a beep sound
37. 37.⚙️ What number does this app show?
    let bill = 72; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.True or false: sorting the scores is an input. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) adding up a bill
40. 40.🔍 Which is the odd one out? (a) tapping a button (b) a pop-up message (c) a result on screen (d) a beep sound

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