App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 302 · 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.True or false: sorting the scores is processing. (a) True (b) False
2. 2.⚙️ What number does this app show?
   let price = 450; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
4. 4.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
5. 5.⚙️ What number does this app show?
   let price = 15; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
6. 6.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
7. 7.True or false: a result on screen is processing. (a) True (b) False
8. 8.⚙️ What number does this app show?
   let bill = 140; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
10. 10.🔍 Which is the odd one out? (a) a buzz (vibration) (b) sorting the scores (c) a beep sound (d) a pop-up message
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 2 (b) line 1 (c) line 4 (d) line 3
12. 12.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
13. 13.True or false: working out a tip is an input. (a) True (b) False
14. 14.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) a result on screen (d) adding up a bill
15. 15.True or false: a buzz (vibration) is an input. (a) True (b) False
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // 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 2 (c) line 3 (d) line 4
17. 17.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) taking a photo (d) typing your age
18. 18.True or false: tapping a button is an output. (a) False (b) True
19. 19.Which of these is an input? (a) a beep sound (b) checking a password (c) typing your age (d) working out a tip
20. 20.⚙️ What number does this app show?
    let price = 480; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.🔍 Which is the odd one out? (a) working out a tip (b) taking a photo (c) sorting the scores (d) adding up a bill
24. 24.🔍 Which is the odd one out? (a) adding up a bill (b) typing your age (c) speaking a command (d) tapping a button
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
26. 26.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
27. 27.⚙️ What number does this app show?
    let bill = 33; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.True or false: checking a password is an output. (a) True (b) False
29. 29.True or false: a beep sound is an output. (a) False (b) True
30. 30.True or false: checking a password is processing. (a) False (b) True
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 4 (b) line 2 (c) line 1 (d) line 3
32. 32.⚙️ What number does this app show?
    let price = 320; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.True or false: tapping a button is an input. (a) True (b) False
34. 34.⚙️ What number does this app show?
    let price = 270; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.True or false: a buzz (vibration) is an output. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let bill = 172; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ 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 2 (b) line 3 (c) line 1 (d) line 4
38. 38.⚙️ 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 4 (b) line 2 (c) line 1 (d) line 3
39. 39.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);

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