App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 839 · 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.⚙️ 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);
2. 2.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
3. 3.Which of these is an input? (a) checking a password (b) speaking a command (c) sorting the scores (d) a buzz (vibration)
4. 4.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) sorting the scores (d) checking a password
5. 5.True or false: checking a password is processing. (a) True (b) False
6. 6.Which of these is an output? (a) typing your age (b) adding up a bill (c) a beep sound (d) speaking a command
7. 7.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) checking a password (d) adding up a bill
8. 8.⚙️ What number does this app show?
   let km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 11; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
10. 10.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
11. 11.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
12. 12.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.True or false: a beep sound is an output. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) sorting the scores (d) taking a photo
15. 15.Which of these is processing? (a) speaking a command (b) typing your age (c) adding up a bill (d) a beep sound
16. 16.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
17. 17.Which of these is an input? (a) taking a photo (b) sorting the scores (c) a buzz (vibration) (d) a beep sound
18. 18.⚙️ 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 2 (c) line 1
19. 19.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
20. 20.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
21. 21.True or false: a buzz (vibration) is an input. (a) False (b) True
22. 22.True or false: typing your age is an input. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) working out a tip (b) a buzz (vibration) (c) adding up a bill (d) sorting the scores
24. 24.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.True or false: taking a photo is an output. (a) False (b) True
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 124; // 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 1 (b) line 3 (c) line 4 (d) line 2
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 270; // 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 4 (b) line 1 (c) line 3 (d) line 2
29. 29.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 1 (b) line 3 (c) line 2 (d) line 4
31. 31.⚙️ What number does this app show?
    let price = 70; // 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) input (b) processing (c) output
33. 33.True or false: a pop-up message is an input. (a) False (b) True
34. 34.True or false: a buzz (vibration) is processing. (a) True (b) False
35. 35.True or false: tapping a button is an input. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.True or false: adding up a bill is an input. (a) True (b) False
38. 38.True or false: adding up a bill is processing. (a) False (b) True
39. 39.True or false: a pop-up message is an output. (a) True (b) False
40. 40.⚙️ What number does this app show?
    let bill = 204; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);

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