App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 692 · 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 price = 10; // 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 1 (b) line 2 (c) line 4 (d) line 3
2. 2.True or false: a beep sound is an output. (a) False (b) True
3. 3.True or false: sorting the scores is an input. (a) True (b) False
4. 4.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
5. 5.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
7. 7.True or false: taking a photo is an input. (a) True (b) False
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // 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 4 (d) line 3
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 75; // 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 3 (c) line 4 (d) line 2
10. 10.Which of these is an input? (a) checking a password (b) adding up a bill (c) tapping a button (d) a buzz (vibration)
11. 11.True or false: adding up a bill is an output. (a) True (b) False
12. 12.⚙️ 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);
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 290; // 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 2 (c) line 4 (d) line 3
14. 14.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) tapping a button (d) working out a tip
15. 15.True or false: typing your age is processing. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) taking a photo (d) a result on screen
17. 17.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.True or false: working out a tip is processing. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // typed by the user
    line 2: let qty = 3; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 4 (c) line 1 (d) line 2
21. 21.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
22. 22.Which of these is an input? (a) speaking a command (b) a buzz (vibration) (c) a result on screen (d) sorting the scores
23. 23.True or false: tapping a button is an output. (a) True (b) False
24. 24.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.True or false: checking a password is an input. (a) False (b) True
26. 26.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
27. 27.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) a pop-up message (d) tapping a button
28. 28.⚙️ 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
29. 29.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) sorting the scores (d) a pop-up message
30. 30.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
31. 31.True or false: speaking a command is processing. (a) True (b) False
32. 32.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
33. 33.🔍 Which is the odd one out? (a) a beep sound (b) adding up a bill (c) a pop-up message (d) a result on screen
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
35. 35.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
36. 36.True or false: taking a photo is processing. (a) False (b) True
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 490; // 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 4 (c) line 2 (d) line 3
38. 38.Which of these is an input? (a) a result on screen (b) adding up a bill (c) typing your age (d) sorting the scores
39. 39.True or false: typing your age is an output. (a) True (b) False
40. 40.True or false: a pop-up message is an output. (a) False (b) True

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