App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 645 · 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 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
2. 2.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
3. 3.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
4. 4.🔍 Which is the odd one out? (a) tapping a button (b) checking a password (c) sorting the scores (d) working out a tip
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 308; // 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 3 (b) line 4 (c) line 1 (d) line 2
6. 6.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 130; // 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 4 (c) line 1 (d) line 2
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 40; // 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 1 (b) line 2 (c) line 3 (d) line 4
9. 9.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) speaking a command (d) sorting the scores
10. 10.Which of these is an output? (a) typing your age (b) speaking a command (c) a result on screen (d) checking a password
11. 11.Which of these is processing? (a) working out a tip (b) speaking a command (c) a result on screen (d) typing your age
12. 12.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 2 (c) line 1 (d) line 4
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 370; // 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 1 (c) line 4 (d) line 3
15. 15.True or false: sorting the scores is processing. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a result on screen (d) typing your age
17. 17.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a result on screen (d) typing your age
18. 18.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
19. 19.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
20. 20.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 1 (c) line 2 (d) line 3
22. 22.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
23. 23.Which of these is processing? (a) typing your age (b) a buzz (vibration) (c) sorting the scores (d) taking a photo
24. 24.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.True or false: a result on screen is processing. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
27. 27.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) speaking a command (d) adding up a bill
28. 28.⚙️ What number does this app show?
    let bill = 90; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.True or false: a pop-up message is an output. (a) False (b) True
30. 30.Which of these is an output? (a) speaking a command (b) a beep sound (c) working out a tip (d) tapping a button
31. 31.True or false: adding up a bill is an input. (a) False (b) True
32. 32.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
33. 33.🔍 Which is the odd one out? (a) checking a password (b) a beep sound (c) sorting the scores (d) working out a tip
34. 34.⚙️ What number does this app show?
    let bill = 210; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 92; // 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 1 (b) line 4 (c) line 3 (d) line 2
36. 36.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
37. 37.⚙️ 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);
38. 38.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 4 (b) line 3 (c) line 2 (d) line 1
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 290; // 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 4 (b) line 2 (c) line 1 (d) line 3

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