App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 267 · 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.True or false: a beep sound is an output. (a) False (b) True
2. 2.Which of these is processing? (a) a result on screen (b) working out a tip (c) a buzz (vibration) (d) a pop-up message
3. 3.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
4. 4.⚙️ What number does this app show?
   let price = 80; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 65; // 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 1 (c) line 2 (d) line 4
6. 6.True or false: typing your age is processing. (a) False (b) True
7. 7.True or false: a result on screen is an output. (a) False (b) True
8. 8.⚙️ 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);
9. 9.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) typing your age (d) a result on screen
10. 10.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) typing your age (d) a pop-up message
11. 11.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
12. 12.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
13. 13.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
14. 14.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) a buzz (vibration) (d) a result on screen
15. 15.⚙️ What number does this app show?
    let bill = 300; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 112; // 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 4 (c) line 2 (d) line 3
17. 17.Which of these is processing? (a) typing your age (b) a buzz (vibration) (c) adding up a bill (d) tapping a button
18. 18.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) checking a password (d) speaking a command
19. 19.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
20. 20.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
22. 22.True or false: working out a tip is processing. (a) False (b) True
23. 23.True or false: a result on screen is an input. (a) True (b) False
24. 24.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
25. 25.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) tapping a button (d) taking a photo
26. 26.Which of these is an input? (a) sorting the scores (b) speaking a command (c) a beep sound (d) working out a tip
27. 27.⚙️ What number does this app show?
    let bill = 177; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.Which of these is an output? (a) speaking a command (b) a pop-up message (c) taking a photo (d) sorting the scores
29. 29.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
31. 31.True or false: tapping a button is an input. (a) True (b) False
32. 32.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
33. 33.Which of these is an input? (a) checking a password (b) a pop-up message (c) a result on screen (d) typing your age
34. 34.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.True or false: speaking a command is an input. (a) True (b) False
36. 36.True or false: taking a photo is an input. (a) True (b) False
37. 37.True or false: a result on screen is processing. (a) False (b) True
38. 38.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
39. 39.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) tapping a button (d) checking a password
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 138; // 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 3 (b) line 1 (c) line 4 (d) line 2

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