App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 578 · 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) working out a tip (b) speaking a command (c) a buzz (vibration) (d) taking a photo
2. 2.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
3. 3.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 136; // 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 2 (b) line 3 (c) line 4 (d) line 1
5. 5.Which of these is processing? (a) taking a photo (b) speaking a command (c) adding up a bill (d) tapping a button
6. 6.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
7. 7.True or false: speaking a command is an output. (a) True (b) False
8. 8.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
9. 9.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) checking a password (d) typing your age
10. 10.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
11. 11.⚙️ 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);
12. 12.True or false: working out a tip is processing. (a) False (b) True
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 102; // 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 1 (b) line 2 (c) line 4 (d) line 3
14. 14.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
16. 16.Which of these is an output? (a) typing your age (b) a result on screen (c) working out a tip (d) checking a password
17. 17.True or false: a beep sound is an output. (a) False (b) True
18. 18.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
19. 19.⚙️ 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 3 (b) line 1 (c) line 2
20. 20.True or false: speaking a command is an input. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.🔍 Which is the odd one out? (a) a pop-up message (b) speaking a command (c) a beep sound (d) a result on screen
24. 24.🔍 Which is the odd one out? (a) adding up a bill (b) speaking a command (c) tapping a button (d) typing your age
25. 25.⚙️ 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
26. 26.True or false: typing your age is processing. (a) False (b) True
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 106; // 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 4 (b) line 1 (c) line 3 (d) line 2
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 580; // 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 3 (b) line 2 (c) line 4 (d) line 1
29. 29.⚙️ What number does this app show?
    let bill = 54; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.True or false: sorting the scores is processing. (a) False (b) True
31. 31.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
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 1 (b) line 2 (c) line 3
33. 33.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.True or false: a pop-up message is an output. (a) False (b) True
35. 35.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
36. 36.True or false: working out a tip is an output. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.Which of these is an input? (a) checking a password (b) speaking a command (c) adding up a bill (d) working out a tip
39. 39.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) a beep sound (d) a result on screen
40. 40.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);

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