App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 307 · 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 is the odd one out? (a) speaking a command (b) a beep sound (c) typing your age (d) taking a photo
2. 2.True or false: a pop-up message is an output. (a) False (b) True
3. 3.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
4. 4.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
5. 5.True or false: sorting the scores is processing. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) a pop-up message (d) a beep sound
7. 7.True or false: a beep sound is processing. (a) True (b) False
8. 8.⚙️ What number does this app show?
   let bill = 177; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.True or false: checking a password is an input. (a) True (b) False
10. 10.⚙️ What number does this app show?
    let bill = 212; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 4 (b) line 2 (c) line 3 (d) line 1
12. 12.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
13. 13.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.True or false: tapping a button is an input. (a) False (b) True
15. 15.True or false: sorting the scores is an output. (a) True (b) False
16. 16.True or false: taking a photo is an output. (a) False (b) True
17. 17.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
18. 18.True or false: sorting the scores is an input. (a) False (b) True
19. 19.Which of these is an output? (a) checking a password (b) working out a tip (c) a result on screen (d) adding up a bill
20. 20.True or false: working out a tip is an input. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a pop-up message (d) working out a tip
24. 24.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
25. 25.⚙️ In an app, is a buzz (vibration) 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 price = 410; // 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 3 (c) line 4 (d) line 1
27. 27.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
28. 28.Which of these is an input? (a) a beep sound (b) a result on screen (c) checking a password (d) speaking a command
29. 29.True or false: tapping a button is processing. (a) False (b) True
30. 30.Which of these is processing? (a) tapping a button (b) taking a photo (c) a beep sound (d) working out a tip
31. 31.True or false: working out a tip is processing. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a result on screen (d) taking a photo
33. 33.🔍 Which is the odd one out? (a) speaking a command (b) a result on screen (c) a beep sound (d) a buzz (vibration)
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 80; // 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 4 (b) line 3 (c) line 2 (d) line 1
35. 35.Which of these is an output? (a) checking a password (b) a pop-up message (c) speaking a command (d) typing your age
36. 36.🔍 Which is the odd one out? (a) speaking a command (b) checking a password (c) tapping a button (d) typing your age
37. 37.True or false: typing your age is an input. (a) False (b) True
38. 38.⚙️ 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 2 (b) line 3 (c) line 1
39. 39.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) sorting the scores (d) taking a photo
40. 40.🔍 Which is the odd one out? (a) a buzz (vibration) (b) typing your age (c) tapping a button (d) taking a photo

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