App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 717 · 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.True or false: a pop-up message is processing. (a) True (b) False
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 80; // typed by the user
   line 2: let qty = 2; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 1 (b) line 4 (c) line 2 (d) line 3
3. 3.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) a result on screen (d) adding up a bill
4. 4.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
5. 5.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
6. 6.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
7. 7.True or false: a result on screen is an input. (a) False (b) True
8. 8.True or false: adding up a bill is processing. (a) True (b) False
9. 9.Which of these is processing? (a) a result on screen (b) typing your age (c) a beep sound (d) working out a tip
10. 10.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) tapping a button
11. 11.True or false: working out a tip is processing. (a) False (b) True
12. 12.Which of these is an output? (a) taking a photo (b) working out a tip (c) typing your age (d) a beep sound
13. 13.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
15. 15.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) tapping a button (d) speaking a command
16. 16.Which of these is an input? (a) typing your age (b) a buzz (vibration) (c) a pop-up message (d) a beep sound
17. 17.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
18. 18.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) sorting the scores
21. 21.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
22. 22.Which of these is processing? (a) tapping a button (b) speaking a command (c) a pop-up message (d) adding up a bill
23. 23.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) a buzz (vibration) (d) checking a password
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
25. 25.True or false: sorting the scores is an output. (a) True (b) False
26. 26.True or false: a pop-up message is an output. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 3 (b) line 2 (c) line 1 (d) line 4
28. 28.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
29. 29.⚙️ 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 3 (b) line 1 (c) line 2
30. 30.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
31. 31.🔍 Which is the odd one out? (a) typing your age (b) a beep sound (c) a buzz (vibration) (d) a result on screen
32. 32.True or false: a buzz (vibration) is an input. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
34. 34.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) speaking a command (d) a pop-up message
35. 35.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.True or false: working out a tip is an output. (a) False (b) True
37. 37.⚙️ 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 2 (b) line 3 (c) line 1
38. 38.⚙️ What number does this app show?
    let bill = 88; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.True or false: taking a photo is an output. (a) True (b) False
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 2 (c) line 1 (d) line 3

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