App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 875 · 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 price = 45; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
2. 2.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
3. 3.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) working out a tip (d) typing your age
4. 4.⚙️ 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
5. 5.True or false: a beep sound is an input. (a) False (b) True
6. 6.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.Which of these is an input? (a) a beep sound (b) a buzz (vibration) (c) a pop-up message (d) tapping a button
8. 8.True or false: a pop-up message is processing. (a) False (b) True
9. 9.True or false: tapping a button is an input. (a) True (b) False
10. 10.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
11. 11.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) a pop-up message (d) working out a tip
12. 12.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
13. 13.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a buzz (vibration) (d) checking a password
14. 14.Which of these is an output? (a) working out a tip (b) checking a password (c) a result on screen (d) taking a photo
15. 15.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 310; // 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 4 (c) line 1 (d) line 3
17. 17.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
18. 18.Which of these is an input? (a) a pop-up message (b) a result on screen (c) a beep sound (d) typing your age
19. 19.True or false: typing your age is an output. (a) False (b) True
20. 20.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
21. 21.True or false: a beep sound is an output. (a) False (b) True
22. 22.True or false: adding up a bill is processing. (a) False (b) True
23. 23.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
24. 24.True or false: speaking a command is an output. (a) False (b) True
25. 25.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
27. 27.⚙️ What number does this app show?
    let bill = 160; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.⚙️ What number does this app show?
    let price = 380; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.Which of these is processing? (a) a pop-up message (b) tapping a button (c) speaking a command (d) sorting the scores
30. 30.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.True or false: adding up a bill is an output. (a) True (b) False
32. 32.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
33. 33.Which of these is an output? (a) working out a tip (b) a pop-up message (c) adding up a bill (d) tapping a button
34. 34.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
35. 35.🔍 Which is the odd one out? (a) a beep sound (b) sorting the scores (c) a pop-up message (d) a result on screen
36. 36.Which of these is an input? (a) sorting the scores (b) a result on screen (c) taking a photo (d) working out a tip
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 3 (c) line 1 (d) line 4
38. 38.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) adding up a bill (d) a result on screen
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 148; // typed by the user
    line 2: let friends = 4; // 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
40. 40.True or false: a buzz (vibration) is processing. (a) True (b) False

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