App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 60 · 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 = 195; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
3. 3.⚙️ What number does this app show?
   let price = 90; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
4. 4.Which of these is an output? (a) working out a tip (b) typing your age (c) a result on screen (d) tapping a button
5. 5.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) typing your age (d) a pop-up message
6. 6.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 530; // 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 3 (b) line 1 (c) line 2 (d) line 4
8. 8.Which of these is an input? (a) checking a password (b) speaking a command (c) a beep sound (d) a pop-up message
9. 9.True or false: a buzz (vibration) is an output. (a) False (b) True
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 1 (b) line 2 (c) line 4 (d) line 3
11. 11.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
12. 12.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
13. 13.True or false: a pop-up message is an input. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) adding up a bill (b) typing your age (c) tapping a button (d) speaking a command
15. 15.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
16. 16.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ 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 3 (c) line 2
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 2 (c) line 4 (d) line 1
19. 19.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) working out a tip (d) a pop-up message
20. 20.Which of these is an input? (a) tapping a button (b) a buzz (vibration) (c) a result on screen (d) adding up a bill
21. 21.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 1 (d) line 3
24. 24.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.Which of these is an output? (a) typing your age (b) working out a tip (c) checking a password (d) a pop-up message
26. 26.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
27. 27.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 104; // 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
29. 29.Which of these is processing? (a) a buzz (vibration) (b) a pop-up message (c) tapping a button (d) checking a password
30. 30.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
31. 31.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
32. 32.Which of these is processing? (a) speaking a command (b) typing your age (c) working out a tip (d) tapping a button
33. 33.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 200; // 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
35. 35.⚙️ What number does this app show?
    let bill = 146; // 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 km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
37. 37.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) a pop-up message
38. 38.Which of these is processing? (a) adding up a bill (b) a buzz (vibration) (c) a result on screen (d) speaking a command
39. 39.True or false: a buzz (vibration) is processing. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) sorting the scores

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