App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 90 · 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 a result on screen an input, processing or an output? (a) output (b) processing (c) input
2. 2.🔍 Which is the odd one out? (a) tapping a button (b) a pop-up message (c) a result on screen (d) a buzz (vibration)
3. 3.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
4. 4.⚙️ 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);
5. 5.Which of these is an input? (a) a pop-up message (b) a beep sound (c) sorting the scores (d) speaking a command
6. 6.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ What number does this app show?
   let km = 2; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
9. 9.⚙️ What number does this app show?
   let price = 65; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
10. 10.Which of these is an input? (a) working out a tip (b) taking a photo (c) a buzz (vibration) (d) checking a password
11. 11.Which of these is an output? (a) taking a photo (b) typing your age (c) checking a password (d) a beep sound
12. 12.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 1 (b) line 2 (c) line 3 (d) line 4
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 141; // 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 1 (c) line 4 (d) line 2
15. 15.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) a beep sound
16. 16.🔍 Which is the odd one out? (a) taking a photo (b) a pop-up message (c) tapping a button (d) speaking a command
17. 17.True or false: a result on screen is processing. (a) False (b) True
18. 18.Which of these is an output? (a) tapping a button (b) a result on screen (c) working out a tip (d) adding up a bill
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 70; // 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 4 (d) line 2
20. 20.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) adding up a bill (d) a beep sound
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 460; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 4 (c) line 3 (d) line 1
22. 22.⚙️ 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
23. 23.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
25. 25.Which of these is an output? (a) checking a password (b) typing your age (c) a buzz (vibration) (d) working out a tip
26. 26.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) working out a tip (d) tapping a button
28. 28.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
29. 29.Which of these is processing? (a) a pop-up message (b) adding up a bill (c) speaking a command (d) tapping a button
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // 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 1 (c) line 3 (d) line 4
31. 31.Which of these is an output? (a) adding up a bill (b) sorting the scores (c) a pop-up message (d) typing your age
32. 32.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.True or false: speaking a command is an input. (a) True (b) False
34. 34.True or false: a beep sound is processing. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) sorting the scores (d) a pop-up message
36. 36.⚙️ What number does this app show?
    let bill = 225; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ 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 1 (b) line 3 (c) line 2
38. 38.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
39. 39.True or false: adding up a bill is processing. (a) False (b) True
40. 40.Which of these is an input? (a) sorting the scores (b) a beep sound (c) working out a tip (d) typing your age

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