App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 932 · 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.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 85; // typed by the user
   line 2: let qty = 4; // 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
3. 3.⚙️ What number does this app show?
   let bill = 102; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.True or false: tapping a button is processing. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) a pop-up message (b) checking a password (c) sorting the scores (d) working out a tip
6. 6.⚙️ What number does this app show?
   let bill = 136; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.True or false: a beep sound is an output. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) a buzz (vibration) (b) tapping a button (c) speaking a command (d) typing your age
9. 9.Which of these is an input? (a) working out a tip (b) a beep sound (c) typing your age (d) a pop-up message
10. 10.Which of these is an input? (a) a beep sound (b) working out a tip (c) taking a photo (d) a pop-up message
11. 11.⚙️ What number does this app show?
    let bill = 117; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) typing your age
13. 13.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.True or false: working out a tip is an input. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) typing your age (d) a beep sound
16. 16.⚙️ 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);
17. 17.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a result on screen (d) sorting the scores
18. 18.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) checking a password
19. 19.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.Which of these is an input? (a) sorting the scores (b) checking a password (c) speaking a command (d) working out a tip
21. 21.True or false: a buzz (vibration) is processing. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) working out a tip (d) speaking a command
23. 23.True or false: speaking a command is processing. (a) True (b) False
24. 24.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 84; // 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 3 (b) line 4 (c) line 1 (d) line 2
26. 26.True or false: adding up a bill is an output. (a) False (b) True
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 550; // 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 4 (c) line 3 (d) line 1
28. 28.⚙️ In an app, is typing your age 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 = 170; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 2 (d) line 4
30. 30.True or false: a result on screen is processing. (a) True (b) False
31. 31.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
32. 32.Which of these is an output? (a) sorting the scores (b) tapping a button (c) a beep sound (d) adding up a bill
33. 33.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
34. 34.True or false: speaking a command is an output. (a) True (b) False
35. 35.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 250; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 1 (c) line 4 (d) line 2
39. 39.True or false: a pop-up message is processing. (a) True (b) False
40. 40.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input

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