App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 378 · 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) adding up a bill (b) checking a password (c) working out a tip (d) a beep sound
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 60; // typed by the user
   line 2: let qty = 4; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 2 (b) line 3 (c) line 4 (d) line 1
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
4. 4.🔍 Which is the odd one out? (a) typing your age (b) a buzz (vibration) (c) taking a photo (d) tapping a button
5. 5.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) working out a tip
6. 6.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 40; // typed by the user
   line 2: let qty = 4; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 2 (b) line 4 (c) line 1 (d) line 3
8. 8.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // typed by the user
   line 2: let qty = 4; // 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
10. 10.Which of these is an output? (a) working out a tip (b) speaking a command (c) a result on screen (d) sorting the scores
11. 11.🔍 Which is the odd one out? (a) a pop-up message (b) taking a photo (c) typing your age (d) tapping a button
12. 12.True or false: a buzz (vibration) is an output. (a) False (b) True
13. 13.⚙️ 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 2 (b) line 1 (c) line 3
14. 14.Which of these is processing? (a) taking a photo (b) tapping a button (c) working out a tip (d) a beep sound
15. 15.Which of these is processing? (a) a result on screen (b) a beep sound (c) taking a photo (d) checking a password
16. 16.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) typing your age (d) a beep sound
17. 17.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
18. 18.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.Which of these is an input? (a) adding up a bill (b) taking a photo (c) a beep sound (d) working out a tip
20. 20.Which of these is processing? (a) speaking a command (b) a pop-up message (c) typing your age (d) sorting the scores
21. 21.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
22. 22.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
23. 23.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
26. 26.True or false: typing your age is an input. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) a result on screen (d) sorting the scores
28. 28.True or false: a beep sound is an input. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 210; // 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 3 (b) line 2 (c) line 1 (d) line 4
31. 31.True or false: typing your age is an output. (a) False (b) True
32. 32.Which of these is an input? (a) a buzz (vibration) (b) sorting the scores (c) speaking a command (d) adding up a bill
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 1 (c) line 4 (d) line 2
34. 34.⚙️ 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 3 (b) line 2 (c) line 1
35. 35.True or false: tapping a button is an input. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) tapping a button (d) working out a tip
37. 37.⚙️ 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);
38. 38.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ 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 1 (b) line 3 (c) line 2
40. 40.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);

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