App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 408 · 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 = 7; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 12; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
3. 3.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
4. 4.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 116; // 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 2 (b) line 1 (c) line 3 (d) line 4
6. 6.🔍 Which is the odd one out? (a) a beep sound (b) adding up a bill (c) a result on screen (d) a buzz (vibration)
7. 7.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) typing your age (d) taking a photo
8. 8.Which of these is processing? (a) speaking a command (b) taking a photo (c) working out a tip (d) a beep sound
9. 9.⚙️ 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);
10. 10.Which of these is an output? (a) a result on screen (b) speaking a command (c) taking a photo (d) adding up a bill
11. 11.Which of these is an output? (a) tapping a button (b) taking a photo (c) a pop-up message (d) speaking a command
12. 12.🔍 Which is the odd one out? (a) a buzz (vibration) (b) tapping a button (c) a result on screen (d) a pop-up message
13. 13.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) working out a tip (d) adding up a bill
14. 14.True or false: taking a photo is processing. (a) False (b) True
15. 15.Which of these is processing? (a) a beep sound (b) a pop-up message (c) typing your age (d) checking a password
16. 16.True or false: a pop-up message is an output. (a) True (b) False
17. 17.Which of these is an input? (a) checking a password (b) taking a photo (c) a beep sound (d) a result on screen
18. 18.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 186; // 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 2 (b) line 1 (c) line 4 (d) line 3
20. 20.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
22. 22.True or false: checking a password is an output. (a) True (b) False
23. 23.True or false: a pop-up message is processing. (a) True (b) False
24. 24.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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 1 (b) line 2 (c) line 4 (d) line 3
26. 26.⚙️ What number does this app show?
    let bill = 126; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.Which of these is processing? (a) adding up a bill (b) taking a photo (c) typing your age (d) a buzz (vibration)
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // 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 4 (c) line 2 (d) line 3
29. 29.Which of these is an input? (a) a beep sound (b) adding up a bill (c) checking a password (d) speaking a command
30. 30.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 450; // 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 1 (b) line 2 (c) line 4 (d) line 3
32. 32.True or false: a result on screen is processing. (a) True (b) False
33. 33.Which of these is an input? (a) tapping a button (b) working out a tip (c) checking a password (d) a result on screen
34. 34.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
35. 35.True or false: sorting the scores is an input. (a) True (b) False
36. 36.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
37. 37.True or false: speaking a command is an input. (a) False (b) True
38. 38.⚙️ 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 2 (b) line 3 (c) line 1
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 2 (c) line 4 (d) line 1
40. 40.Which of these is an output? (a) speaking a command (b) taking a photo (c) a beep sound (d) working out a tip

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