App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 513 · 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 bill = 84; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
3. 3.⚙️ What number does this app show?
   let bill = 325; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.⚙️ What number does this app show?
   let km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.Which of these is an input? (a) checking a password (b) a result on screen (c) adding up a bill (d) taking a photo
7. 7.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 90; // 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 1 (b) line 2 (c) line 3 (d) line 4
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 34; // 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 1 (b) line 2 (c) line 3 (d) line 4
10. 10.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) speaking a command (d) taking a photo
11. 11.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
12. 12.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) checking a password
13. 13.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) a beep sound (d) adding up a bill
14. 14.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
16. 16.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) speaking a command (d) a buzz (vibration)
17. 17.🔍 Which is the odd one out? (a) checking a password (b) taking a photo (c) working out a tip (d) sorting the scores
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // typed by the user
    line 2: let qty = 6; // 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
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 144; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 2 (c) line 4 (d) line 3
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
21. 21.⚙️ What number does this app show?
    let bill = 20; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.Which of these is an output? (a) a buzz (vibration) (b) adding up a bill (c) speaking a command (d) typing your age
23. 23.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
24. 24.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.True or false: a result on screen is an output. (a) True (b) False
26. 26.True or false: working out a tip is an output. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // typed by the user
    line 2: let off = 40; // 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
28. 28.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
30. 30.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) a buzz (vibration) (d) sorting the scores
31. 31.True or false: adding up a bill is an output. (a) False (b) True
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 480; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 2 (d) line 3
34. 34.True or false: sorting the scores is an output. (a) True (b) False
35. 35.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 144; // 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 2 (c) line 1 (d) line 4
37. 37.Which of these is an input? (a) a beep sound (b) sorting the scores (c) speaking a command (d) checking a password
38. 38.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
39. 39.🔍 Which is the odd one out? (a) working out a tip (b) a pop-up message (c) a result on screen (d) a buzz (vibration)
40. 40.True or false: adding up a bill is an input. (a) False (b) True

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