App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 803 · 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 line does the processing (works out the answer)?
   line 1: let price = 100; // 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 4 (b) line 1 (c) line 3 (d) line 2
2. 2.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) sorting the scores (d) a result on screen
3. 3.Which of these is processing? (a) checking a password (b) taking a photo (c) tapping a button (d) typing your age
4. 4.True or false: typing your age is an input. (a) False (b) True
5. 5.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
6. 6.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) speaking a command (d) typing your age
7. 7.Which of these is an output? (a) tapping a button (b) a beep sound (c) checking a password (d) adding up a bill
8. 8.Which of these is processing? (a) a beep sound (b) sorting the scores (c) taking a photo (d) a pop-up message
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 114; // 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 1 (b) line 3 (c) line 2 (d) line 4
10. 10.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 365; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 2 (c) line 4 (d) line 3
12. 12.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 128; // 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 2 (c) line 1 (d) line 3
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
15. 15.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) tapping a button (d) typing your age
17. 17.⚙️ 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 1 (c) line 4 (d) line 3
18. 18.True or false: taking a photo is an input. (a) False (b) True
19. 19.Which of these is an input? (a) sorting the scores (b) adding up a bill (c) a result on screen (d) typing your age
20. 20.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
21. 21.Which of these is an output? (a) sorting the scores (b) a pop-up message (c) taking a photo (d) typing your age
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 4 (c) line 3 (d) line 2
23. 23.True or false: speaking a command is processing. (a) False (b) True
24. 24.Which of these is an output? (a) working out a tip (b) tapping a button (c) speaking a command (d) a buzz (vibration)
25. 25.Which of these is an input? (a) adding up a bill (b) a result on screen (c) tapping a button (d) a beep sound
26. 26.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) checking a password (d) adding up a bill
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
28. 28.True or false: sorting the scores is an input. (a) False (b) True
29. 29.True or false: typing your age is processing. (a) False (b) True
30. 30.Which of these is an input? (a) speaking a command (b) sorting the scores (c) a buzz (vibration) (d) a beep sound
31. 31.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) a buzz (vibration) (d) a pop-up message
32. 32.⚙️ What number does this app show?
    let bill = 220; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.Which of these is an output? (a) sorting the scores (b) a result on screen (c) adding up a bill (d) typing your age
34. 34.⚙️ What number does this app show?
    let bill = 66; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) speaking a command (d) working out a tip
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 2 (b) line 4 (c) line 1 (d) line 3
37. 37.True or false: adding up a bill is an input. (a) True (b) False
38. 38.⚙️ 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);
39. 39.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
40. 40.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);

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