App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 273 · 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 = 75; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
2. 2.⚙️ What number does this app show?
   let price = 55; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
3. 3.True or false: sorting the scores is processing. (a) True (b) False
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 120; // 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 2 (d) line 3
5. 5.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
6. 6.Which of these is processing? (a) a result on screen (b) sorting the scores (c) typing your age (d) tapping a button
7. 7.Which of these is processing? (a) a beep sound (b) typing your age (c) tapping a button (d) working out a tip
8. 8.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) a buzz (vibration) (d) typing your age
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 55; // 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 3 (c) line 1 (d) line 4
10. 10.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.🔍 Which is the odd one out? (a) typing your age (b) working out a tip (c) sorting the scores (d) checking a password
12. 12.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
13. 13.Which of these is an input? (a) a result on screen (b) adding up a bill (c) speaking a command (d) a pop-up message
14. 14.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
16. 16.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) adding up a bill (d) a pop-up message
18. 18.Which of these is an output? (a) typing your age (b) adding up a bill (c) a result on screen (d) taking a photo
19. 19.True or false: a pop-up message is an input. (a) True (b) False
20. 20.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
22. 22.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
23. 23.True or false: adding up a bill is an output. (a) False (b) True
24. 24.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
27. 27.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) working out a tip (d) sorting the scores
28. 28.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
29. 29.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 300; // 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
31. 31.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
32. 32.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
33. 33.True or false: a beep sound is an input. (a) True (b) False
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 1 (b) line 4 (c) line 3 (d) line 2
35. 35.⚙️ What number does this app show?
    let bill = 80; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.True or false: working out a tip is processing. (a) False (b) True
37. 37.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 55; // 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 4 (c) line 2 (d) line 1
39. 39.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) typing your age (d) checking a password
40. 40.True or false: a result on screen is an output. (a) False (b) True

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