App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 350 · 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 = 100; // 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 3 (b) line 1 (c) line 2 (d) line 4
2. 2.⚙️ What number does this app show?
   let bill = 192; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.True or false: checking a password is processing. (a) False (b) True
4. 4.⚙️ 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 3 (b) line 1 (c) line 2 (d) line 4
5. 5.⚙️ 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 2 (b) line 1 (c) line 3 (d) line 4
6. 6.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
7. 7.True or false: checking a password is an output. (a) True (b) False
8. 8.True or false: taking a photo is processing. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) speaking a command (d) typing your age
10. 10.True or false: speaking a command is an input. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) a buzz (vibration) (d) working out a tip
12. 12.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
13. 13.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) sorting the scores (d) tapping a button
14. 14.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) working out a tip (d) speaking a command
15. 15.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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
17. 17.True or false: taking a photo is an input. (a) False (b) True
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 3 (d) line 1
19. 19.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
20. 20.True or false: tapping a button is an input. (a) False (b) True
21. 21.Which of these is an input? (a) checking a password (b) working out a tip (c) speaking a command (d) a beep sound
22. 22.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
23. 23.⚙️ 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);
24. 24.⚙️ 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 1 (b) line 3 (c) line 2
25. 25.🔍 Which is the odd one out? (a) typing your age (b) a result on screen (c) a beep sound (d) a buzz (vibration)
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
27. 27.True or false: adding up a bill is an output. (a) True (b) False
28. 28.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
29. 29.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.🔍 Which is the odd one out? (a) working out a tip (b) a pop-up message (c) checking a password (d) sorting the scores
31. 31.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.Which of these is an output? (a) tapping a button (b) a buzz (vibration) (c) checking a password (d) taking a photo
33. 33.Which of these is an input? (a) typing your age (b) a pop-up message (c) a beep sound (d) checking a password
34. 34.True or false: sorting the scores is an input. (a) False (b) True
35. 35.Which of these is an output? (a) a pop-up message (b) tapping a button (c) sorting the scores (d) typing your age
36. 36.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
37. 37.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 234; // 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 1 (b) line 4 (c) line 2 (d) line 3
40. 40.True or false: tapping a button is an output. (a) False (b) True

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