App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 167 · 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) typing your age (b) tapping a button (c) a result on screen (d) speaking a command
2. 2.True or false: typing your age is an input. (a) False (b) True
3. 3.⚙️ What number does this app show?
   let bill = 220; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.True or false: working out a tip is an input. (a) False (b) True
5. 5.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
6. 6.Which of these is processing? (a) a beep sound (b) a buzz (vibration) (c) typing your age (d) working out a tip
7. 7.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) adding up a bill (d) working out a tip
8. 8.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
9. 9.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
10. 10.True or false: a buzz (vibration) is an input. (a) True (b) False
11. 11.True or false: taking a photo is an output. (a) False (b) True
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 3 (c) line 1 (d) line 4
14. 14.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
15. 15.🔍 Which is the odd one out? (a) adding up a bill (b) a buzz (vibration) (c) a pop-up message (d) a result on screen
16. 16.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
17. 17.⚙️ 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);
18. 18.Which of these is an input? (a) taking a photo (b) working out a tip (c) a pop-up message (d) sorting the scores
19. 19.Which of these is an output? (a) sorting the scores (b) speaking a command (c) working out a tip (d) a pop-up message
20. 20.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.Which of these is processing? (a) tapping a button (b) speaking a command (c) a buzz (vibration) (d) checking a password
22. 22.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
23. 23.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) a buzz (vibration) (d) a beep sound
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 4 (b) line 3 (c) line 2 (d) line 1
25. 25.Which of these is processing? (a) a buzz (vibration) (b) a pop-up message (c) taking a photo (d) sorting the scores
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 171; // 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 4 (b) line 2 (c) line 3 (d) line 1
27. 27.True or false: a result on screen is an input. (a) True (b) False
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // 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 2 (c) line 1 (d) line 3
29. 29.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
31. 31.🔍 Which is the odd one out? (a) typing your age (b) working out a tip (c) speaking a command (d) taking a photo
32. 32.Which of these is an input? (a) a result on screen (b) a pop-up message (c) working out a tip (d) typing your age
33. 33.True or false: adding up a bill is an output. (a) True (b) False
34. 34.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.True or false: speaking a command is processing. (a) True (b) False
37. 37.Which of these is processing? (a) speaking a command (b) a beep sound (c) adding up a bill (d) taking a photo
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 3 (b) line 2 (c) line 4 (d) line 1
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 4 (b) line 3 (c) line 2 (d) line 1
40. 40.⚙️ What number does this app show?
    let price = 320; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);

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