App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 763 · 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.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
2. 2.True or false: tapping a button is an output. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) a pop-up message (d) a buzz (vibration)
4. 4.True or false: a beep sound is processing. (a) False (b) True
5. 5.Which of these is processing? (a) a buzz (vibration) (b) speaking a command (c) sorting the scores (d) a beep sound
6. 6.True or false: sorting the scores is processing. (a) True (b) False
7. 7.⚙️ What number does this app show?
   let price = 15; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ What number does this app show?
   let km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.🔍 Which is the odd one out? (a) typing your age (b) a beep sound (c) taking a photo (d) tapping a button
10. 10.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a pop-up message (d) working out a tip
11. 11.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
12. 12.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
13. 13.⚙️ What number does this app show?
    let bill = 165; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.⚙️ What number does this app show?
    let bill = 237; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.True or false: tapping a button is an input. (a) False (b) True
16. 16.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
17. 17.Which of these is an output? (a) taking a photo (b) working out a tip (c) a buzz (vibration) (d) speaking a command
18. 18.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
19. 19.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 1 (d) line 3
21. 21.Which of these is an input? (a) speaking a command (b) adding up a bill (c) a pop-up message (d) a result on screen
22. 22.Which of these is an output? (a) tapping a button (b) adding up a bill (c) a beep sound (d) sorting the scores
23. 23.⚙️ 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);
24. 24.⚙️ 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);
25. 25.⚙️ 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 1 (b) line 2 (c) line 3
26. 26.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
29. 29.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
30. 30.True or false: working out a tip is processing. (a) True (b) False
31. 31.Which of these is an input? (a) taking a photo (b) adding up a bill (c) checking a password (d) working out a tip
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 270; // 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 4 (b) line 2 (c) line 1 (d) line 3
33. 33.True or false: a result on screen is an input. (a) False (b) True
34. 34.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
35. 35.True or false: taking a photo is processing. (a) False (b) True
36. 36.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) taking a photo (d) typing your age
38. 38.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.True or false: checking a password is an output. (a) False (b) True

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