App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 392 · 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 checking a password an input, processing or an output? (a) input (b) output (c) processing
2. 2.Which of these is an output? (a) a result on screen (b) checking a password (c) adding up a bill (d) tapping a button
3. 3.Which of these is an output? (a) checking a password (b) taking a photo (c) a pop-up message (d) adding up a bill
4. 4.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 325; // 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 2 (d) line 4
6. 6.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
7. 7.Which of these is an input? (a) a beep sound (b) working out a tip (c) checking a password (d) taking a photo
8. 8.True or false: speaking a command is an input. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) a buzz (vibration) (d) sorting the scores
10. 10.True or false: sorting the scores is processing. (a) True (b) False
11. 11.True or false: a pop-up message is processing. (a) True (b) False
12. 12.Which of these is an output? (a) adding up a bill (b) typing your age (c) taking a photo (d) a buzz (vibration)
13. 13.⚙️ What number does this app show?
    let bill = 30; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.True or false: typing your age is an input. (a) True (b) False
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 380; // 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 2 (b) line 4 (c) line 3 (d) line 1
16. 16.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
17. 17.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) sorting the scores (d) tapping a button
18. 18.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2
20. 20.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) a beep sound
21. 21.True or false: checking a password is an input. (a) False (b) True
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 315; // 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 2 (b) line 1 (c) line 3 (d) line 4
23. 23.⚙️ 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);
24. 24.True or false: a result on screen is processing. (a) True (b) False
25. 25.Which of these is an input? (a) typing your age (b) sorting the scores (c) checking a password (d) a pop-up message
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 236; // 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 3 (b) line 1 (c) line 4 (d) line 2
27. 27.True or false: adding up a bill is an output. (a) True (b) False
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 55; // 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 3 (c) line 2 (d) line 4
29. 29.Which of these is an output? (a) speaking a command (b) a beep sound (c) checking a password (d) sorting the scores
30. 30.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) adding up a bill (d) a buzz (vibration)
31. 31.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) a pop-up message (d) sorting the scores
33. 33.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.True or false: checking a password is processing. (a) True (b) False
35. 35.True or false: working out a tip is an output. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 177; // 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 4 (c) line 2 (d) line 3
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 4 (d) line 3
39. 39.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
40. 40.True or false: a pop-up message is an output. (a) False (b) True

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