App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 766 · 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.True or false: a pop-up message is an output. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) a result on screen (b) typing your age (c) speaking a command (d) taking a photo
3. 3.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
4. 4.True or false: a result on screen is an output. (a) False (b) True
5. 5.⚙️ What number does this app show?
   let bill = 245; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) taking a photo (d) speaking a command
8. 8.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) tapping a button (d) a result on screen
9. 9.⚙️ What number does this app show?
   let bill = 153; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
11. 11.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
12. 12.⚙️ What number does this app show?
    let bill = 84; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.Which of these is an output? (a) sorting the scores (b) typing your age (c) tapping a button (d) a beep sound
14. 14.⚙️ 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 1 (c) line 3 (d) line 2
15. 15.True or false: checking a password is processing. (a) False (b) True
16. 16.True or false: typing your age is an output. (a) True (b) False
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 1 (c) line 3 (d) line 2
18. 18.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.Which of these is an output? (a) a result on screen (b) speaking a command (c) tapping a button (d) adding up a bill
20. 20.True or false: checking a password is an input. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) typing your age (d) checking a password
22. 22.Which of these is an input? (a) a pop-up message (b) speaking a command (c) working out a tip (d) adding up a bill
23. 23.Which of these is processing? (a) sorting the scores (b) taking a photo (c) a pop-up message (d) speaking a command
24. 24.Which of these is an input? (a) typing your age (b) a beep sound (c) checking a password (d) a result on screen
25. 25.True or false: taking a photo is processing. (a) False (b) True
26. 26.True or false: tapping a button is an input. (a) False (b) True
27. 27.True or false: taking a photo is an input. (a) False (b) True
28. 28.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.True or false: working out a tip is an input. (a) False (b) True
30. 30.True or false: working out a tip is an output. (a) True (b) False
31. 31.Which of these is processing? (a) a beep sound (b) tapping a button (c) working out a tip (d) taking a photo
32. 32.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) typing your age (d) a buzz (vibration)
33. 33.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
34. 34.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ What number does this app show?
    let bill = 58; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 4 (c) line 3 (d) line 1
37. 37.True or false: tapping a button is processing. (a) True (b) False
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 1 (b) line 4 (c) line 2 (d) line 3
39. 39.True or false: a beep sound is processing. (a) False (b) True
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 3 (c) line 1 (d) line 4

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