App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 519 · 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 is the odd one out? (a) checking a password (b) adding up a bill (c) a beep sound (d) sorting the scores
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 40; // 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 1 (b) line 3 (c) line 4 (d) line 2
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 1 (c) line 2
4. 4.⚙️ What number does this app show?
   let price = 50; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
5. 5.Which of these is processing? (a) checking a password (b) a pop-up message (c) tapping a button (d) taking a photo
6. 6.Which of these is processing? (a) a result on screen (b) taking a photo (c) typing your age (d) adding up a bill
7. 7.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
8. 8.Which of these is processing? (a) tapping a button (b) typing your age (c) taking a photo (d) sorting the scores
9. 9.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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 4 (d) line 2
11. 11.True or false: a pop-up message is an input. (a) False (b) True
12. 12.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
13. 13.Which of these is an input? (a) working out a tip (b) checking a password (c) typing your age (d) a beep sound
14. 14.⚙️ What number does this app show?
    let bill = 100; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.Which of these is an output? (a) a beep sound (b) adding up a bill (c) tapping a button (d) sorting the scores
17. 17.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
18. 18.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
20. 20.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
21. 21.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) checking a password (d) sorting the scores
22. 22.True or false: checking a password is an output. (a) True (b) False
23. 23.Which of these is processing? (a) working out a tip (b) a pop-up message (c) a buzz (vibration) (d) speaking a command
24. 24.True or false: working out a tip is an input. (a) True (b) False
25. 25.True or false: taking a photo is an output. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) checking a password (b) a pop-up message (c) adding up a bill (d) working out a tip
27. 27.⚙️ 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);
28. 28.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) working out a tip (d) a buzz (vibration)
29. 29.Which of these is an output? (a) a result on screen (b) working out a tip (c) taking a photo (d) adding up a bill
30. 30.True or false: a beep sound is processing. (a) False (b) True
31. 31.True or false: tapping a button is processing. (a) True (b) False
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // 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 2 (b) line 1 (c) line 4 (d) line 3
33. 33.True or false: a beep sound is an output. (a) False (b) True
34. 34.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.🔍 Which is the odd one out? (a) typing your age (b) checking a password (c) taking a photo (d) speaking a command
36. 36.⚙️ 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
37. 37.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) checking a password (d) a result on screen
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 123; // 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
39. 39.⚙️ What number does this app show?
    let bill = 159; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) adding up a bill

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