App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 831 · 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.⚙️ What number does this app show?
   let price = 410; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.🔍 Which is the odd one out? (a) tapping a button (b) sorting the scores (c) typing your age (d) speaking a command
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
4. 4.Which of these is processing? (a) checking a password (b) tapping a button (c) a pop-up message (d) speaking a command
5. 5.⚙️ What number does this app show?
   let price = 360; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.⚙️ What number does this app show?
   let km = 11; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ What number does this app show?
   let price = 90; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ What number does this app show?
   let km = 13; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
10. 10.True or false: sorting the scores is processing. (a) False (b) True
11. 11.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
12. 12.🔍 Which is the odd one out? (a) adding up a bill (b) a pop-up message (c) sorting the scores (d) working out a tip
13. 13.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
14. 14.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) a beep sound (d) checking a password
15. 15.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) adding up a bill (d) a beep sound
16. 16.True or false: sorting the scores is an input. (a) False (b) True
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 180; // 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 1 (b) line 4 (c) line 2 (d) line 3
18. 18.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a pop-up message (d) taking a photo
19. 19.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
20. 20.Which of these is an output? (a) checking a password (b) taking a photo (c) a beep sound (d) typing your age
21. 21.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) speaking a command (d) typing your age
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 156; // 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 4 (b) line 2 (c) line 1 (d) line 3
23. 23.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.Which of these is an output? (a) adding up a bill (b) typing your age (c) a buzz (vibration) (d) taking a photo
25. 25.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) typing your age (d) sorting the scores
26. 26.⚙️ 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 4 (b) line 3 (c) line 1 (d) line 2
27. 27.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.Which of these is an input? (a) working out a tip (b) sorting the scores (c) typing your age (d) a beep sound
29. 29.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.True or false: a result on screen is an input. (a) False (b) True
31. 31.Which of these is an input? (a) working out a tip (b) checking a password (c) sorting the scores (d) taking a photo
32. 32.True or false: taking a photo is an input. (a) True (b) False
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 2 (c) line 3 (d) line 1
34. 34.⚙️ What number does this app show?
    let bill = 159; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 510; // 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 3 (b) line 4 (c) line 1 (d) line 2
36. 36.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ What number does this app show?
    let price = 490; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.True or false: adding up a bill is an input. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) typing your age (d) taking a photo
40. 40.⚙️ What number does this app show?
    let price = 570; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);

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