App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 91 · 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 of these is an output? (a) sorting the scores (b) working out a tip (c) a pop-up message (d) tapping a button
2. 2.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.True or false: taking a photo is an input. (a) False (b) True
4. 4.True or false: sorting the scores is an output. (a) True (b) False
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 11; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
6. 6.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) typing your age (d) taking a photo
7. 7.Which of these is processing? (a) speaking a command (b) adding up a bill (c) typing your age (d) taking a photo
8. 8.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.⚙️ What number does this app show?
   let bill = 90; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ What number does this app show?
    let bill = 390; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.Which of these is an input? (a) working out a tip (b) sorting the scores (c) taking a photo (d) a result on screen
12. 12.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
13. 13.True or false: checking a password is processing. (a) False (b) True
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 98; // 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 2 (b) line 1 (c) line 4 (d) line 3
15. 15.Which of these is an input? (a) a pop-up message (b) typing your age (c) a beep sound (d) adding up a bill
16. 16.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 1 (c) line 3 (d) line 2
18. 18.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
20. 20.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
21. 21.⚙️ What number does this app show?
    let bill = 123; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) working out a tip
23. 23.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 2 (d) line 4
25. 25.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
27. 27.Which of these is processing? (a) a beep sound (b) checking a password (c) typing your age (d) taking a photo
28. 28.True or false: a buzz (vibration) is an input. (a) True (b) False
29. 29.Which of these is processing? (a) working out a tip (b) a buzz (vibration) (c) taking a photo (d) tapping a button
30. 30.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
32. 32.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
34. 34.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) speaking a command
36. 36.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.True or false: speaking a command is an input. (a) False (b) True
38. 38.Which of these is an input? (a) sorting the scores (b) working out a tip (c) a result on screen (d) speaking a command
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // 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 4 (b) line 1 (c) line 3 (d) line 2
40. 40.Which of these is an output? (a) taking a photo (b) a beep sound (c) adding up a bill (d) typing your age

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