App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 828 · 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) tapping a button (b) taking a photo (c) typing your age (d) sorting the scores
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 190; // 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 4 (c) line 2 (d) line 3
3. 3.⚙️ What number does this app show?
   let bill = 140; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 70; // 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 3 (d) line 1
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 30; // 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 2 (b) line 4 (c) line 1 (d) line 3
6. 6.True or false: tapping a button is an output. (a) True (b) False
7. 7.⚙️ What number does this app show?
   let price = 270; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.Which of these is an output? (a) a beep sound (b) working out a tip (c) typing your age (d) tapping a button
9. 9.True or false: typing your age is processing. (a) True (b) False
10. 10.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
11. 11.True or false: taking a photo is processing. (a) True (b) False
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 1 (c) line 4 (d) line 3
13. 13.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
14. 14.🔍 Which is the odd one out? (a) working out a tip (b) taking a photo (c) speaking a command (d) typing your age
15. 15.True or false: a beep sound is an input. (a) False (b) True
16. 16.True or false: sorting the scores is an output. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) tapping a button (d) typing your age
18. 18.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
19. 19.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 4 (c) line 1 (d) line 2
21. 21.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) adding up a bill (d) tapping a button
22. 22.⚙️ 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 3 (b) line 2 (c) line 1
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 4 (c) line 1 (d) line 2
24. 24.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
25. 25.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) typing your age
28. 28.🔍 Which is the odd one out? (a) adding up a bill (b) a pop-up message (c) sorting the scores (d) working out a tip
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 4 (c) line 2 (d) line 1
30. 30.True or false: a result on screen is an input. (a) True (b) False
31. 31.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
33. 33.True or false: speaking a command is an output. (a) True (b) False
34. 34.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) adding up a bill (d) a beep sound
35. 35.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
36. 36.True or false: a buzz (vibration) is an output. (a) False (b) True
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // 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 3 (c) line 1 (d) line 4
38. 38.True or false: adding up a bill is an output. (a) True (b) False
39. 39.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
40. 40.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing

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