App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 924 · 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 input? (a) a pop-up message (b) adding up a bill (c) a buzz (vibration) (d) tapping a button
2. 2.True or false: adding up a bill is an input. (a) False (b) True
3. 3.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
4. 4.True or false: taking a photo is an output. (a) False (b) True
5. 5.⚙️ What number does this app show?
   let price = 460; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.Which of these is an output? (a) sorting the scores (b) a buzz (vibration) (c) checking a password (d) speaking a command
7. 7.Which of these is an input? (a) a pop-up message (b) working out a tip (c) checking a password (d) taking a photo
8. 8.True or false: taking a photo is processing. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) working out a tip (b) a buzz (vibration) (c) sorting the scores (d) adding up a bill
10. 10.True or false: checking a password is processing. (a) False (b) True
11. 11.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 220; // 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
13. 13.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
14. 14.True or false: adding up a bill is processing. (a) True (b) False
15. 15.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
16. 16.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a result on screen
18. 18.⚙️ What number does this app show?
    let bill = 36; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
20. 20.Which of these is an output? (a) adding up a bill (b) a result on screen (c) tapping a button (d) working out a tip
21. 21.True or false: typing your age is an output. (a) True (b) False
22. 22.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 110; // 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 2 (b) line 1 (c) line 3 (d) line 4
24. 24.🔍 Which is the odd one out? (a) working out a tip (b) a beep sound (c) sorting the scores (d) adding up a bill
25. 25.True or false: tapping a button is an input. (a) True (b) False
26. 26.True or false: checking a password is an output. (a) True (b) False
27. 27.Which of these is an output? (a) checking a password (b) a pop-up message (c) adding up a bill (d) working out a tip
28. 28.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.Which of these is processing? (a) typing your age (b) a pop-up message (c) tapping a button (d) checking a password
30. 30.⚙️ What number does this app show?
    let bill = 64; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
32. 32.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
34. 34.Which of these is processing? (a) tapping a button (b) taking a photo (c) working out a tip (d) speaking a command
35. 35.True or false: a beep sound is an output. (a) False (b) True
36. 36.True or false: working out a tip is an input. (a) True (b) False
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 2 (b) line 4 (c) line 3 (d) line 1
38. 38.True or false: taking a photo is an input. (a) False (b) True
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 220; // 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 2 (c) line 4 (d) line 1
40. 40.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) a beep sound

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