App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 252 · 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 speaking a command an input, processing or an output? (a) output (b) input (c) processing
2. 2.True or false: a buzz (vibration) is an output. (a) True (b) False
3. 3.⚙️ 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
4. 4.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
5. 5.Which of these is an input? (a) a buzz (vibration) (b) a pop-up message (c) taking a photo (d) checking a password
6. 6.True or false: a beep sound is processing. (a) False (b) True
7. 7.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
9. 9.⚙️ What number does this app show?
   let km = 8; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.Which of these is an output? (a) working out a tip (b) a beep sound (c) typing your age (d) tapping a button
11. 11.True or false: checking a password is an output. (a) False (b) True
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 440; // typed by the user
    line 2: let off = 40; // 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
13. 13.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
14. 14.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
15. 15.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) typing your age (d) tapping a button
16. 16.Which of these is an input? (a) checking a password (b) sorting the scores (c) speaking a command (d) a pop-up message
17. 17.True or false: a beep sound is an output. (a) True (b) False
18. 18.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 280; // 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
20. 20.🔍 Which is the odd one out? (a) typing your age (b) a pop-up message (c) a buzz (vibration) (d) a result on screen
21. 21.Which of these is an output? (a) a result on screen (b) adding up a bill (c) taking a photo (d) working out a tip
22. 22.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) typing your age (d) a pop-up message
23. 23.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
24. 24.⚙️ What number does this app show?
    let bill = 230; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 2 (b) line 3 (c) line 1 (d) line 4
26. 26.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) sorting the scores
27. 27.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
28. 28.True or false: speaking a command is an input. (a) True (b) False
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 264; // 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 1 (b) line 4 (c) line 2 (d) line 3
30. 30.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) taking a photo (d) working out a tip
31. 31.⚙️ 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 1 (b) line 3 (c) line 2
32. 32.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) tapping a button (d) taking a photo
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 450; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 4 (c) line 1 (d) line 3
35. 35.True or false: working out a tip is an output. (a) False (b) True
36. 36.Which of these is processing? (a) a result on screen (b) taking a photo (c) typing your age (d) adding up a bill
37. 37.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
38. 38.True or false: typing your age is an output. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 168; // 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 2 (b) line 3 (c) line 4 (d) line 1
40. 40.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);

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