App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 181 · 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 = 390; // 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 2 (b) line 4 (c) line 1 (d) line 3
2. 2.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
3. 3.True or false: speaking a command is an output. (a) True (b) False
4. 4.⚙️ What number does this app show?
   let bill = 188; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ What number does this app show?
   let price = 550; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.⚙️ What number does this app show?
   let km = 5; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
8. 8.Which of these is an output? (a) a beep sound (b) working out a tip (c) tapping a button (d) typing your age
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 4 (d) line 1
10. 10.True or false: adding up a bill is processing. (a) False (b) True
11. 11.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
12. 12.⚙️ What number does this app show?
    let bill = 160; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.True or false: sorting the scores is processing. (a) True (b) False
14. 14.True or false: a pop-up message is an output. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) speaking a command (d) typing your age
16. 16.Which of these is an input? (a) adding up a bill (b) typing your age (c) a result on screen (d) checking a password
17. 17.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a beep sound (d) taking a photo
18. 18.⚙️ What number does this app show?
    let bill = 52; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
20. 20.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
21. 21.Which of these is an output? (a) a pop-up message (b) taking a photo (c) tapping a button (d) adding up a bill
22. 22.True or false: working out a tip is processing. (a) False (b) True
23. 23.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
24. 24.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 270; // 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 2 (b) line 1 (c) line 4 (d) line 3
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 3 (b) line 1 (c) line 2 (d) line 4
27. 27.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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
30. 30.🔍 Which is the odd one out? (a) checking a password (b) a buzz (vibration) (c) adding up a bill (d) sorting the scores
31. 31.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
32. 32.Which of these is an input? (a) a pop-up message (b) speaking a command (c) a beep sound (d) sorting the scores
33. 33.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
34. 34.True or false: taking a photo is an input. (a) True (b) False
35. 35.Which of these is processing? (a) a beep sound (b) a result on screen (c) adding up a bill (d) tapping a button
36. 36.⚙️ What number does this app show?
    let bill = 76; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ What number does this app show?
    let bill = 40; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.Which of these is processing? (a) speaking a command (b) taking a photo (c) sorting the scores (d) tapping a button
39. 39.True or false: a buzz (vibration) is an input. (a) True (b) False
40. 40.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);

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