App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 166 · 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 is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) a pop-up message
2. 2.⚙️ What number does this app show?
   let price = 35; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
3. 3.Which of these is processing? (a) taking a photo (b) working out a tip (c) tapping a button (d) a pop-up message
4. 4.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) adding up a bill (d) typing your age
5. 5.Which of these is an input? (a) typing your age (b) working out a tip (c) checking a password (d) a result on screen
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 45; // 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 1 (b) line 2 (c) line 3 (d) line 4
7. 7.True or false: a buzz (vibration) is processing. (a) True (b) False
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 540; // 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 3 (c) line 4 (d) line 1
9. 9.True or false: sorting the scores is an input. (a) False (b) True
10. 10.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
11. 11.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: a result on screen is processing. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) working out a tip (d) speaking a command
14. 14.Which of these is processing? (a) a buzz (vibration) (b) checking a password (c) a pop-up message (d) tapping a button
15. 15.True or false: a buzz (vibration) is an output. (a) False (b) True
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 340; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 2 (c) line 4 (d) line 3
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 180; // 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 4 (c) line 1 (d) line 3
18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 370; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 1 (c) line 4 (d) line 3
20. 20.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
21. 21.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) taking a photo (d) typing your age
22. 22.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.True or false: a result on screen is an input. (a) True (b) False
24. 24.True or false: working out a tip is processing. (a) True (b) False
25. 25.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
26. 26.True or false: sorting the scores is processing. (a) False (b) True
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 220; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 1 (c) line 2 (d) line 4
28. 28.True or false: checking a password is an output. (a) True (b) False
29. 29.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
31. 31.Which of these is an output? (a) speaking a command (b) typing your age (c) a pop-up message (d) working out a tip
32. 32.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) tapping a button (d) checking a password
34. 34.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.Which of these is processing? (a) a buzz (vibration) (b) taking a photo (c) adding up a bill (d) tapping a button
36. 36.True or false: taking a photo is processing. (a) True (b) False
37. 37.True or false: checking a password is processing. (a) False (b) True
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 560; // 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 4 (b) line 2 (c) line 3 (d) line 1
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 570; // 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 2 (d) line 1
40. 40.True or false: a result on screen is an output. (a) True (b) False

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