App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 502 · 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 = 10; // 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 2 (b) line 4 (c) line 3 (d) line 1
2. 2.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ 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 3 (c) line 1 (d) line 4
4. 4.⚙️ What number does this app show?
   let km = 7; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.True or false: adding up a bill is an input. (a) True (b) False
6. 6.Which of these is an output? (a) speaking a command (b) typing your age (c) sorting the scores (d) a pop-up message
7. 7.True or false: speaking a command is an input. (a) False (b) True
8. 8.Which of these is processing? (a) speaking a command (b) a result on screen (c) a pop-up message (d) sorting the scores
9. 9.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
10. 10.True or false: a beep sound is an output. (a) True (b) False
11. 11.Which of these is an output? (a) tapping a button (b) working out a tip (c) checking a password (d) a result on screen
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 3 (b) line 1 (c) line 2 (d) line 4
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
14. 14.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
15. 15.🔍 Which is the odd one out? (a) typing your age (b) a pop-up message (c) a buzz (vibration) (d) a beep sound
16. 16.⚙️ 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 1 (b) line 2 (c) line 3
17. 17.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
18. 18.Which of these is processing? (a) typing your age (b) working out a tip (c) speaking a command (d) a beep sound
19. 19.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
20. 20.⚙️ What number does this app show?
    let bill = 225; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.Which of these is an input? (a) a buzz (vibration) (b) typing your age (c) adding up a bill (d) a beep sound
22. 22.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ 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 2 (c) line 1
24. 24.⚙️ 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);
25. 25.Which of these is an input? (a) tapping a button (b) adding up a bill (c) a buzz (vibration) (d) checking a password
26. 26.True or false: working out a tip is processing. (a) True (b) False
27. 27.True or false: working out a tip is an output. (a) False (b) True
28. 28.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 4 (d) line 2
30. 30.True or false: tapping a button is an input. (a) True (b) False
31. 31.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 48; // 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 3 (c) line 1 (d) line 4
34. 34.True or false: taking a photo is an input. (a) True (b) False
35. 35.True or false: checking a password is processing. (a) True (b) False
36. 36.Which of these is an output? (a) tapping a button (b) typing your age (c) taking a photo (d) a buzz (vibration)
37. 37.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) taking a photo (d) checking a password
38. 38.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) tapping a button (d) typing your age
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 4 (b) line 3 (c) line 1 (d) line 2
40. 40.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing

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