App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 100 · 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 bill = 231; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.True or false: a beep sound is an output. (a) True (b) False
3. 3.Which of these is processing? (a) tapping a button (b) checking a password (c) a beep sound (d) speaking a command
4. 4.⚙️ What number does this app show?
   let price = 30; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
5. 5.True or false: speaking a command is processing. (a) False (b) True
6. 6.Which of these is an output? (a) sorting the scores (b) a pop-up message (c) typing your age (d) taking a photo
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 205; // 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
8. 8.True or false: adding up a bill is processing. (a) False (b) True
9. 9.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
10. 10.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
11. 11.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
12. 12.True or false: typing your age is an output. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a beep sound (d) speaking a command
14. 14.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
15. 15.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 2 (c) line 4 (d) line 1
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 220; // 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 1 (d) line 2
18. 18.Which of these is an output? (a) tapping a button (b) checking a password (c) a beep sound (d) speaking a command
19. 19.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) a result on screen (d) tapping a button
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 2 (c) line 3 (d) line 1
21. 21.Which of these is processing? (a) a pop-up message (b) a result on screen (c) a buzz (vibration) (d) working out a tip
22. 22.⚙️ 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 3 (b) line 2 (c) line 1
23. 23.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) sorting the scores (d) checking a password
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
25. 25.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
27. 27.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
28. 28.Which of these is an input? (a) a buzz (vibration) (b) a result on screen (c) tapping a button (d) sorting the scores
29. 29.🔍 Which is the odd one out? (a) a beep sound (b) adding up a bill (c) a result on screen (d) a pop-up message
30. 30.True or false: taking a photo is an input. (a) True (b) False
31. 31.Which of these is an input? (a) checking a password (b) a beep sound (c) speaking a command (d) a pop-up message
32. 32.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
33. 33.True or false: a result on screen is an output. (a) False (b) True
34. 34.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) a buzz (vibration)
37. 37.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a buzz (vibration) (d) speaking a command
38. 38.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 220; // 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
40. 40.Which of these is an output? (a) tapping a button (b) adding up a bill (c) a result on screen (d) working out a tip

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