App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 318 · 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) a buzz (vibration) (b) a pop-up message (c) typing your age (d) a beep sound
2. 2.⚙️ What number does this app show?
   let bill = 156; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 75; // 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
4. 4.Which of these is an input? (a) tapping a button (b) adding up a bill (c) a pop-up message (d) sorting the scores
5. 5.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
6. 6.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 10; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
8. 8.⚙️ 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 3 (b) line 1 (c) line 2
9. 9.Which of these is processing? (a) adding up a bill (b) a result on screen (c) a pop-up message (d) speaking a command
10. 10.True or false: working out a tip is processing. (a) False (b) True
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 3 (c) line 2 (d) line 1
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // 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 1 (d) line 3
13. 13.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) a beep sound (d) checking a password
14. 14.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) a buzz (vibration) (d) typing your age
15. 15.Which of these is an input? (a) adding up a bill (b) a pop-up message (c) sorting the scores (d) typing your age
16. 16.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 170; // 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 4 (c) line 2 (d) line 3
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 1 (b) line 2 (c) line 4 (d) line 3
19. 19.True or false: a beep sound is an output. (a) False (b) True
20. 20.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
22. 22.Which of these is an output? (a) a result on screen (b) checking a password (c) sorting the scores (d) taking a photo
23. 23.True or false: checking a password is an input. (a) False (b) True
24. 24.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ What number does this app show?
    let bill = 212; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.Which of these is processing? (a) working out a tip (b) typing your age (c) a buzz (vibration) (d) speaking a command
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // 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.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
30. 30.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.Which of these is an input? (a) working out a tip (b) a pop-up message (c) taking a photo (d) a buzz (vibration)
32. 32.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
33. 33.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) sorting the scores (d) speaking a command
34. 34.True or false: taking a photo is an input. (a) False (b) True
35. 35.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
36. 36.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
37. 37.🔍 Which is the odd one out? (a) sorting the scores (b) tapping a button (c) taking a photo (d) typing your age
38. 38.True or false: typing your age is an input. (a) True (b) False
39. 39.True or false: sorting the scores is processing. (a) False (b) True
40. 40.⚙️ What number does this app show?
    let price = 490; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);

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