App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 51 · 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) speaking a command (c) taking a photo (d) checking a password
2. 2.True or false: checking a password is an output. (a) False (b) True
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 86; // 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
4. 4.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
5. 5.True or false: a buzz (vibration) is processing. (a) False (b) True
6. 6.⚙️ What number does this app show?
   let price = 50; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.Which of these is an input? (a) a buzz (vibration) (b) tapping a button (c) working out a tip (d) a result on screen
8. 8.True or false: a pop-up message is an output. (a) False (b) True
9. 9.Which of these is an output? (a) checking a password (b) a beep sound (c) taking a photo (d) typing your age
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 1 (b) line 2 (c) line 3 (d) line 4
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 2 (c) line 4 (d) line 3
12. 12.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
14. 14.⚙️ What number does this app show?
    let bill = 84; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 3 (d) line 4
16. 16.⚙️ What number does this app show?
    let bill = 170; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) working out a tip
18. 18.True or false: sorting the scores is an output. (a) False (b) True
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 92; // typed by the user
    line 2: let friends = 4; // 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
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 308; // typed by the user
    line 2: let friends = 4; // 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
21. 21.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.Which of these is processing? (a) sorting the scores (b) a result on screen (c) typing your age (d) a pop-up message
23. 23.Which of these is an input? (a) a pop-up message (b) working out a tip (c) sorting the scores (d) taking a photo
24. 24.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 4 (c) line 3 (d) line 2
27. 27.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
28. 28.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) tapping a button (d) typing your age
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 260; // 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 3 (b) line 1 (c) line 4 (d) line 2
30. 30.True or false: sorting the scores is processing. (a) True (b) False
31. 31.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) a buzz (vibration) (d) a beep sound
33. 33.⚙️ What number does this app show?
    let bill = 156; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.True or false: speaking a command is an input. (a) True (b) False
35. 35.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 1 (c) line 2 (d) line 3
37. 37.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
38. 38.Which of these is processing? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) checking a password
39. 39.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);

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