App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 626 · 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 = 220; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ What number does this app show?
   let price = 45; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
3. 3.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ What number does this app show?
   let price = 15; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
5. 5.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) sorting the scores (d) tapping a button
6. 6.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a beep sound (d) typing your age
7. 7.⚙️ What number does this app show?
   let price = 75; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ What number does this app show?
   let bill = 174; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.Which of these is processing? (a) tapping a button (b) working out a tip (c) a beep sound (d) taking a photo
11. 11.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
12. 12.⚙️ What number does this app show?
    let price = 570; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.True or false: a buzz (vibration) is an output. (a) False (b) True
14. 14.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ 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);
16. 16.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
17. 17.True or false: a pop-up message is processing. (a) False (b) True
18. 18.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
19. 19.True or false: sorting the scores is an output. (a) False (b) True
20. 20.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
21. 21.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.True or false: sorting the scores is an input. (a) False (b) True
23. 23.Which of these is an output? (a) a pop-up message (b) adding up a bill (c) tapping a button (d) working out a tip
24. 24.Which of these is an output? (a) typing your age (b) a result on screen (c) tapping a button (d) sorting the scores
25. 25.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
27. 27.Which of these is an output? (a) sorting the scores (b) adding up a bill (c) a buzz (vibration) (d) taking a photo
28. 28.Which of these is an input? (a) adding up a bill (b) typing your age (c) working out a tip (d) a pop-up message
29. 29.True or false: typing your age is an input. (a) True (b) False
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 110; // 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 3 (d) line 1
31. 31.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) typing your age (d) checking a password
34. 34.True or false: a result on screen is an input. (a) True (b) False
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 580; // 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 2 (b) line 3 (c) line 4 (d) line 1
36. 36.⚙️ 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 3 (b) line 4 (c) line 2 (d) line 1
37. 37.⚙️ 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);
38. 38.True or false: tapping a button is an input. (a) False (b) True
39. 39.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
40. 40.True or false: typing your age is an output. (a) False (b) True

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