App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 926 · 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.⚙️ What number does this app show?
   let km = 15; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.🔍 Which is the odd one out? (a) sorting the scores (b) taking a photo (c) typing your age (d) tapping a button
3. 3.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) a pop-up message (d) a buzz (vibration)
4. 4.⚙️ What number does this app show?
   let bill = 176; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.Which of these is an input? (a) sorting the scores (b) typing your age (c) adding up a bill (d) checking a password
6. 6.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) checking a password (d) adding up a bill
7. 7.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
8. 8.Which of these is an output? (a) sorting the scores (b) adding up a bill (c) working out a tip (d) a pop-up message
9. 9.⚙️ What number does this app show?
   let bill = 146; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ 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);
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 213; // 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
13. 13.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
14. 14.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
15. 15.True or false: sorting the scores is processing. (a) False (b) True
16. 16.⚙️ What number does this app show?
    let bill = 216; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.True or false: a result on screen 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 of these is processing? (a) a result on screen (b) speaking a command (c) a beep sound (d) working out a tip
20. 20.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
21. 21.True or false: a pop-up message is processing. (a) False (b) True
22. 22.True or false: adding up a bill is processing. (a) True (b) False
23. 23.Which of these is an input? (a) adding up a bill (b) checking a password (c) sorting the scores (d) tapping a button
24. 24.Which of these is an input? (a) a buzz (vibration) (b) a beep sound (c) taking a photo (d) adding up a bill
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
26. 26.True or false: taking a photo is an output. (a) False (b) True
27. 27.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 335; // 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 4 (b) line 2 (c) line 3 (d) line 1
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
31. 31.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) typing your age (d) taking a photo
32. 32.True or false: speaking a command is an input. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) speaking a command (d) tapping a button
34. 34.True or false: tapping a button is an output. (a) True (b) False
35. 35.True or false: a buzz (vibration) is an output. (a) False (b) True
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 204; // 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
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 4 (b) line 3 (c) line 1 (d) line 2
38. 38.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
39. 39.Which of these is processing? (a) a result on screen (b) typing your age (c) adding up a bill (d) a pop-up message
40. 40.True or false: typing your age is an output. (a) True (b) False

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