App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 715 · 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 = 265; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ What number does this app show?
   let km = 14; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.True or false: a pop-up message is an output. (a) False (b) True
4. 4.Which of these is processing? (a) tapping a button (b) adding up a bill (c) a result on screen (d) typing your age
5. 5.Which of these is an input? (a) a buzz (vibration) (b) working out a tip (c) adding up a bill (d) speaking a command
6. 6.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a result on screen (d) speaking a command
7. 7.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
8. 8.True or false: working out a tip is an output. (a) True (b) False
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 65; // 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 3 (b) line 1 (c) line 4 (d) line 2
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 2 (b) line 4 (c) line 1 (d) line 3
11. 11.⚙️ What number does this app show?
    let bill = 22; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
13. 13.True or false: working out a tip is processing. (a) True (b) False
14. 14.True or false: a buzz (vibration) is processing. (a) False (b) True
15. 15.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // 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.True or false: taking a photo is an input. (a) False (b) True
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 123; // 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 4 (c) line 3 (d) line 1
19. 19.⚙️ What number does this app show?
    let bill = 183; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.True or false: a result on screen is an input. (a) True (b) False
21. 21.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
22. 22.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 2 (c) line 1 (d) line 3
24. 24.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) working out a tip (d) a beep sound
25. 25.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) working out a tip
26. 26.True or false: a beep sound is processing. (a) False (b) True
27. 27.Which of these is an output? (a) speaking a command (b) typing your age (c) a result on screen (d) checking a password
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
29. 29.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
30. 30.Which of these is an input? (a) typing your age (b) a beep sound (c) a result on screen (d) working out a tip
31. 31.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
33. 33.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) a result on screen (d) adding up a bill
34. 34.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
35. 35.Which of these is an output? (a) typing your age (b) tapping a button (c) a pop-up message (d) taking a photo
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // typed by the user
    line 2: let qty = 5; // 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
37. 37.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) checking a password (d) a result on screen
38. 38.True or false: working out a tip is an input. (a) True (b) False
39. 39.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.True or false: tapping a button is processing. (a) False (b) True

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