App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 227 · 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 = 72; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.Which of these is processing? (a) tapping a button (b) working out a tip (c) a beep sound (d) speaking a command
3. 3.True or false: tapping a button is an input. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) working out a tip (d) checking a password
5. 5.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
6. 6.⚙️ What number does this app show?
   let bill = 112; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.⚙️ What number does this app show?
   let km = 2; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 280; // 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 4 (b) line 2 (c) line 3 (d) line 1
10. 10.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) typing your age
11. 11.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
12. 12.⚙️ 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
13. 13.True or false: a beep sound is an output. (a) False (b) True
14. 14.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
16. 16.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
17. 17.Which of these is processing? (a) a buzz (vibration) (b) a result on screen (c) adding up a bill (d) taking a photo
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 175; // 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 4 (c) line 2 (d) line 3
19. 19.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
20. 20.Which of these is processing? (a) a pop-up message (b) speaking a command (c) sorting the scores (d) a beep sound
21. 21.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) a pop-up message
22. 22.⚙️ What number does this app show?
    let bill = 56; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
24. 24.True or false: a buzz (vibration) is an output. (a) True (b) False
25. 25.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
27. 27.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
28. 28.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 180; // 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 4 (b) line 3 (c) line 2 (d) line 1
30. 30.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) working out a tip (d) a pop-up message
31. 31.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
32. 32.True or false: a result on screen is an output. (a) True (b) False
33. 33.True or false: a result on screen is an input. (a) False (b) True
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 158; // 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 1 (c) line 2 (d) line 3
35. 35.Which of these is an output? (a) adding up a bill (b) a result on screen (c) checking a password (d) sorting the scores
36. 36.⚙️ What number does this app show?
    let bill = 400; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.Which of these is an output? (a) adding up a bill (b) tapping a button (c) a pop-up message (d) working out a tip
38. 38.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) adding up a bill
40. 40.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing

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