App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 753 · 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 beep sound (b) working out a tip (c) sorting the scores (d) taking a photo
2. 2.⚙️ What number does this app show?
   let bill = 128; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.True or false: a result on screen is an input. (a) True (b) False
4. 4.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
5. 5.⚙️ What number does this app show?
   let price = 320; // 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) typing your age (b) tapping a button (c) speaking a command (d) a result on screen
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 160; // 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 2 (b) line 1 (c) line 4 (d) line 3
8. 8.True or false: a pop-up message is processing. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) typing your age (d) speaking a command
10. 10.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) taking a photo (d) sorting the scores
11. 11.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) taking a photo (d) tapping a button
12. 12.🔍 Which is the odd one out? (a) a beep sound (b) tapping a button (c) typing your age (d) speaking a command
13. 13.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) taking a photo (d) speaking a command
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 an input. (a) False (b) True
16. 16.⚙️ 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 4 (d) line 3
17. 17.Which of these is an output? (a) tapping a button (b) a pop-up message (c) taking a photo (d) adding up a bill
18. 18.True or false: a beep sound is an output. (a) True (b) False
19. 19.⚙️ What number does this app show?
    let bill = 76; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 430; // 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 4 (b) line 3 (c) line 2 (d) line 1
21. 21.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
22. 22.Which of these is an input? (a) checking a password (b) tapping a button (c) a result on screen (d) a beep sound
23. 23.True or false: tapping a button is an input. (a) False (b) True
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
25. 25.True or false: checking a password is processing. (a) False (b) True
26. 26.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
27. 27.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.True or false: checking a password is an input. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.🔍 Which is the odd one out? (a) checking a password (b) a buzz (vibration) (c) a result on screen (d) a pop-up message
31. 31.⚙️ What number does this app show?
    let price = 570; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.Which of these is processing? (a) taking a photo (b) a buzz (vibration) (c) checking a password (d) a result on screen
33. 33.True or false: a result on screen is an output. (a) True (b) False
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 96; // 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 1 (c) line 4 (d) line 3
35. 35.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
36. 36.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 400; // 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 3 (b) line 2 (c) line 4 (d) line 1
39. 39.⚙️ 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 2 (c) line 3
40. 40.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a result on screen (d) sorting the scores

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