App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 559 · 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) a result on screen (b) checking a password (c) sorting the scores (d) tapping a button
2. 2.⚙️ What number does this app show?
   let bill = 295; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ 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 3 (b) line 2 (c) line 1
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 590; // typed by the user
   line 2: let off = 20; // 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
5. 5.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
6. 6.⚙️ What number does this app show?
   let price = 45; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
7. 7.True or false: a result on screen is an input. (a) False (b) True
8. 8.True or false: checking a password is processing. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a result on screen (d) adding up a bill
10. 10.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
11. 11.True or false: a pop-up message is an input. (a) False (b) True
12. 12.Which of these is processing? (a) tapping a button (b) taking a photo (c) a beep sound (d) adding up a bill
13. 13.Which of these is an output? (a) working out a tip (b) tapping a button (c) a buzz (vibration) (d) speaking a command
14. 14.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
15. 15.Which of these is processing? (a) working out a tip (b) a beep sound (c) typing your age (d) tapping a button
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
17. 17.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
18. 18.True or false: working out a tip is an output. (a) True (b) False
19. 19.Which of these is an input? (a) working out a tip (b) checking a password (c) tapping a button (d) sorting the scores
20. 20.True or false: adding up a bill is processing. (a) False (b) True
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // 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 4 (c) line 3 (d) line 1
22. 22.Which of these is an input? (a) a pop-up message (b) sorting the scores (c) checking a password (d) typing your age
23. 23.True or false: a buzz (vibration) is an input. (a) False (b) True
24. 24.True or false: speaking a command is processing. (a) True (b) False
25. 25.⚙️ What number does this app show?
    let bill = 236; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.🔍 Which is the odd one out? (a) a buzz (vibration) (b) tapping a button (c) a result on screen (d) a beep sound
27. 27.True or false: sorting the scores is processing. (a) False (b) True
28. 28.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ What number does this app show?
    let bill = 69; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ 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);
32. 32.True or false: typing your age is an input. (a) True (b) False
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // typed by the user
    line 2: let qty = 4; // 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
34. 34.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
35. 35.True or false: typing your age is an output. (a) False (b) True
36. 36.Which of these is processing? (a) a pop-up message (b) tapping a button (c) speaking a command (d) checking a password
37. 37.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing

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