App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 561 · 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.True or false: checking a password is processing. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) typing your age
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 65; // 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
4. 4.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a pop-up message (d) working out a tip
5. 5.True or false: typing your age is an input. (a) True (b) False
6. 6.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
7. 7.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
8. 8.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) a beep sound (d) a result on screen
9. 9.Which of these is an input? (a) checking a password (b) sorting the scores (c) taking a photo (d) working out a tip
10. 10.⚙️ In an app, is a pop-up message 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 price = 240; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 4 (c) line 3 (d) line 2
12. 12.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a pop-up message (d) tapping a button
13. 13.True or false: working out a tip is processing. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) a result on screen (d) a pop-up message
15. 15.True or false: speaking a command is an output. (a) True (b) False
16. 16.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
17. 17.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 36; // 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 3 (b) line 4 (c) line 1 (d) line 2
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 160; // 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 4 (c) line 3 (d) line 2
20. 20.🔍 Which is the odd one out? (a) adding up a bill (b) a result on screen (c) sorting the scores (d) working out a tip
21. 21.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
22. 22.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) a pop-up message
23. 23.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 228; // 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 3 (c) line 2 (d) line 1
25. 25.Which of these is processing? (a) sorting the scores (b) a pop-up message (c) taking a photo (d) a buzz (vibration)
26. 26.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) a beep sound (d) sorting the scores
27. 27.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
28. 28.Which of these is an input? (a) tapping a button (b) a pop-up message (c) a buzz (vibration) (d) adding up a bill
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 132; // 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 3 (b) line 4 (c) line 1 (d) line 2
30. 30.Which of these is an input? (a) sorting the scores (b) a beep sound (c) a pop-up message (d) speaking a command
31. 31.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
32. 32.Which of these is an output? (a) typing your age (b) a pop-up message (c) working out a tip (d) checking a password
33. 33.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.⚙️ 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);
35. 35.⚙️ What number does this app show?
    let bill = 207; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.⚙️ 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);
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 1 (b) line 2 (c) line 3 (d) line 4
38. 38.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);

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