App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 568 · 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 = 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 3 (b) line 4 (c) line 1 (d) line 2
2. 2.Which of these is an output? (a) speaking a command (b) sorting the scores (c) working out a tip (d) a result on screen
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 4; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
4. 4.🔍 Which is the odd one out? (a) working out a tip (b) a buzz (vibration) (c) sorting the scores (d) adding up a bill
5. 5.⚙️ What number does this app show?
   let price = 230; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
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 is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) typing your age
8. 8.⚙️ What number does this app show?
   let price = 300; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
10. 10.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
11. 11.Which of these is an output? (a) taking a photo (b) typing your age (c) tapping a button (d) a beep sound
12. 12.Which of these is processing? (a) sorting the scores (b) speaking a command (c) taking a photo (d) typing your age
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 60; // 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
14. 14.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
16. 16.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
17. 17.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 220; // 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 4 (b) line 2 (c) line 3 (d) line 1
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 142; // 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 2 (d) line 4
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 260; // 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 4 (c) line 1 (d) line 2
21. 21.Which of these is an input? (a) speaking a command (b) checking a password (c) a beep sound (d) sorting the scores
22. 22.True or false: checking a password is an output. (a) False (b) True
23. 23.Which of these is processing? (a) working out a tip (b) a result on screen (c) a pop-up message (d) a buzz (vibration)
24. 24.True or false: tapping a button is an output. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) working out a tip
26. 26.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) taking a photo (d) checking a password
27. 27.⚙️ What number does this app show?
    let bill = 148; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.⚙️ 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 3 (b) line 2 (c) line 1
29. 29.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a beep sound (d) working out a tip
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 340; // 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 4 (c) line 3 (d) line 2
31. 31.Which of these is processing? (a) taking a photo (b) checking a password (c) typing your age (d) a buzz (vibration)
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (b) line 3 (c) line 2 (d) line 1
33. 33.⚙️ What number does this app show?
    let bill = 69; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.Which of these is an output? (a) tapping a button (b) taking a photo (c) a pop-up message (d) checking a password
36. 36.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
37. 37.Which of these is processing? (a) taking a photo (b) a result on screen (c) typing your age (d) adding up a bill
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 42; // 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 2 (c) line 3 (d) line 1
39. 39.True or false: speaking a command is an output. (a) True (b) False
40. 40.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing

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