App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 107 · 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 of these is an output? (a) taking a photo (b) working out a tip (c) adding up a bill (d) a beep sound
2. 2.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) a result on screen
3. 3.⚙️ What number does this app show?
   let price = 90; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
5. 5.True or false: checking a password is processing. (a) False (b) True
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 15; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
7. 7.True or false: typing your age is an output. (a) False (b) True
8. 8.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
9. 9.⚙️ What number does this app show?
   let price = 420; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
11. 11.Which of these is an output? (a) tapping a button (b) taking a photo (c) a result on screen (d) typing your age
12. 12.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 580; // 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 1 (b) line 3 (c) line 2 (d) line 4
14. 14.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
15. 15.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a pop-up message (d) checking a password
16. 16.⚙️ What number does this app show?
    let bill = 200; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.⚙️ 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 3 (b) line 1 (c) line 2
18. 18.Which of these is processing? (a) a pop-up message (b) working out a tip (c) tapping a button (d) taking a photo
19. 19.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) sorting the scores (d) working out a tip
21. 21.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
22. 22.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) a buzz (vibration) (d) checking a password
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 288; // 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 2 (b) line 3 (c) line 1 (d) line 4
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 2 (b) line 1 (c) line 4 (d) line 3
25. 25.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) adding up a bill (d) speaking a command
26. 26.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
28. 28.⚙️ What number does this app show?
    let bill = 148; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.🔍 Which is the odd one out? (a) a beep sound (b) taking a photo (c) a result on screen (d) a buzz (vibration)
30. 30.Which of these is an input? (a) typing your age (b) a result on screen (c) a beep sound (d) adding up a bill
31. 31.True or false: taking a photo is an input. (a) False (b) True
32. 32.⚙️ 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);
33. 33.Which of these is processing? (a) tapping a button (b) typing your age (c) checking a password (d) a pop-up message
34. 34.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
35. 35.True or false: tapping a button is an input. (a) True (b) False
36. 36.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
37. 37.Which of these is an input? (a) adding up a bill (b) a result on screen (c) taking a photo (d) a beep sound
38. 38.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
39. 39.True or false: a result on screen is an output. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) a beep sound

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