App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 268 · 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 of these is an output? (a) adding up a bill (b) typing your age (c) tapping a button (d) a beep sound
2. 2.Which of these is an output? (a) adding up a bill (b) tapping a button (c) typing your age (d) a buzz (vibration)
3. 3.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
4. 4.True or false: taking a photo is an input. (a) True (b) False
5. 5.True or false: checking a password is an input. (a) False (b) True
6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 14; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
8. 8.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
9. 9.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) adding up a bill (d) a buzz (vibration)
10. 10.⚙️ 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 1 (b) line 3 (c) line 2
11. 11.True or false: a pop-up message is an output. (a) True (b) False
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
13. 13.True or false: a beep sound is an output. (a) True (b) False
14. 14.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
15. 15.True or false: taking a photo is processing. (a) True (b) False
16. 16.⚙️ What number does this app show?
    let price = 240; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
19. 19.⚙️ What number does this app show?
    let price = 580; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
21. 21.True or false: a pop-up message is processing. (a) True (b) False
22. 22.Which of these is an input? (a) working out a tip (b) sorting the scores (c) a buzz (vibration) (d) tapping a button
23. 23.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.Which of these is an input? (a) a beep sound (b) a pop-up message (c) adding up a bill (d) speaking a command
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 1 (c) line 3 (d) line 4
26. 26.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) sorting the scores (d) a beep sound
27. 27.True or false: a result on screen is processing. (a) False (b) True
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 370; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 3 (c) line 4 (d) line 1
29. 29.Which of these is an output? (a) a pop-up message (b) adding up a bill (c) tapping a button (d) speaking a command
30. 30.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) a beep sound (d) checking a password
31. 31.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) tapping a button
33. 33.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
34. 34.True or false: sorting the scores is an output. (a) False (b) True
35. 35.Which of these is processing? (a) speaking a command (b) a pop-up message (c) a buzz (vibration) (d) adding up a bill
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 1 (c) line 2 (d) line 3
37. 37.True or false: typing your age is an output. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) typing your age (d) a buzz (vibration)
39. 39.Which of these is an input? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) typing your age
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 150; // 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 1 (c) line 4 (d) line 3

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