App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 507 · 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 km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.Which of these is processing? (a) a result on screen (b) a beep sound (c) taking a photo (d) working out a tip
3. 3.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
4. 4.⚙️ What number does this app show?
   let bill = 200; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ 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
6. 6.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) tapping a button
7. 7.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) checking a password (d) taking a photo
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 210; // typed by the user
   line 2: let off = 20; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 2 (b) line 3 (c) line 1 (d) line 4
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 78; // 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 2 (b) line 1 (c) line 4 (d) line 3
10. 10.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 4 (c) line 2 (d) line 3
12. 12.🔍 Which is the odd one out? (a) typing your age (b) a result on screen (c) a pop-up message (d) a beep sound
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) typing your age (b) speaking a command (c) tapping a button (d) a beep sound
15. 15.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
17. 17.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ What number does this app show?
    let bill = 28; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 290; // typed by the user
    line 2: let off = 20; // 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
20. 20.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) adding up a bill
21. 21.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a result on screen (d) typing your age
22. 22.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
23. 23.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) checking a password
24. 24.Which of these is an input? (a) adding up a bill (b) speaking a command (c) a pop-up message (d) a beep sound
25. 25.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
26. 26.True or false: adding up a bill is processing. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
28. 28.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
29. 29.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 66; // 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 4 (b) line 3 (c) line 1 (d) line 2
31. 31.⚙️ What number does this app show?
    let bill = 132; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.True or false: a result on screen is an output. (a) False (b) True
33. 33.True or false: a buzz (vibration) is an output. (a) False (b) True
34. 34.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
36. 36.True or false: taking a photo is an output. (a) True (b) False
37. 37.True or false: typing your age is an input. (a) False (b) True
38. 38.True or false: taking a photo is an input. (a) False (b) True
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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
40. 40.🔍 Which is the odd one out? (a) checking a password (b) a pop-up message (c) sorting the scores (d) working out a tip

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