App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 653 · 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 = 55; // 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 4 (c) line 1 (d) line 3
2. 2.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) a pop-up message (d) adding up a bill
3. 3.True or false: a pop-up message is an output. (a) False (b) True
4. 4.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 92; // 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 1 (b) line 3 (c) line 2 (d) line 4
7. 7.⚙️ What number does this app show?
   let bill = 125; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.⚙️ 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);
9. 9.Which of these is processing? (a) speaking a command (b) a pop-up message (c) typing your age (d) working out a tip
10. 10.True or false: taking a photo is an output. (a) False (b) True
11. 11.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
13. 13.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
14. 14.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
15. 15.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
16. 16.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
17. 17.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
18. 18.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.Which of these is processing? (a) adding up a bill (b) taking a photo (c) a beep sound (d) tapping a button
20. 20.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
21. 21.🔍 Which is the odd one out? (a) checking a password (b) taking a photo (c) working out a tip (d) sorting the scores
22. 22.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
24. 24.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
25. 25.True or false: taking a photo is an input. (a) True (b) False
26. 26.True or false: adding up a bill is an output. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) typing your age (d) adding up a bill
28. 28.⚙️ What number does this app show?
    let bill = 46; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) working out a tip (d) typing your age
30. 30.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.True or false: working out a tip is an output. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) typing your age (d) speaking a command
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 45; // 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 3 (b) line 4 (c) line 2 (d) line 1
34. 34.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) taking a photo (d) speaking a command
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 150; // 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 3 (d) line 1
36. 36.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) taking a photo (d) a pop-up message
37. 37.True or false: a beep sound is an output. (a) True (b) False
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
39. 39.Which of these is an output? (a) typing your age (b) working out a tip (c) a result on screen (d) taking a photo
40. 40.True or false: a beep sound is an input. (a) False (b) True

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