App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 685 · 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.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
2. 2.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) typing your age (d) speaking a command
3. 3.⚙️ What number does this app show?
   let bill = 355; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.Which of these is processing? (a) tapping a button (b) speaking a command (c) working out a tip (d) a beep sound
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 160; // 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 2 (b) line 1 (c) line 3 (d) line 4
6. 6.Which of these is an input? (a) working out a tip (b) a beep sound (c) speaking a command (d) a buzz (vibration)
7. 7.Which of these is an output? (a) typing your age (b) tapping a button (c) sorting the scores (d) a pop-up message
8. 8.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
9. 9.⚙️ What number does this app show?
   let price = 510; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.🔍 Which is the odd one out? (a) sorting the scores (b) tapping a button (c) taking a photo (d) typing your age
11. 11.⚙️ 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);
12. 12.🔍 Which is the odd one out? (a) a beep sound (b) speaking a command (c) taking a photo (d) tapping a button
13. 13.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
14. 14.True or false: typing your age is processing. (a) False (b) True
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 135; // 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 2 (b) line 3 (c) line 1 (d) line 4
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
17. 17.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.⚙️ What number does this app show?
    let bill = 42; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
20. 20.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
21. 21.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 129; // 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 3 (c) line 1 (d) line 4
23. 23.⚙️ 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);
24. 24.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
25. 25.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
29. 29.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) a result on screen (d) working out a tip
30. 30.Which of these is an input? (a) tapping a button (b) checking a password (c) a buzz (vibration) (d) a beep sound
31. 31.True or false: tapping a button is an input. (a) True (b) False
32. 32.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
33. 33.True or false: a result on screen is an output. (a) False (b) True
34. 34.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.⚙️ What number does this app show?
    let bill = 105; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.Which of these is an output? (a) typing your age (b) speaking a command (c) a result on screen (d) checking a password
38. 38.True or false: working out a tip is an output. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 120; // 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 2 (b) line 1 (c) line 4 (d) line 3
40. 40.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);

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