App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 174 · 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.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
3. 3.True or false: a pop-up message is an output. (a) True (b) False
4. 4.True or false: tapping a button is an output. (a) False (b) True
5. 5.True or false: a beep sound is an output. (a) True (b) False
6. 6.⚙️ What number does this app show?
   let price = 90; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
8. 8.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
9. 9.Which of these is an output? (a) speaking a command (b) typing your age (c) adding up a bill (d) a beep sound
10. 10.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) typing your age (d) speaking a command
12. 12.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
13. 13.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
14. 14.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.⚙️ What number does this app show?
    let km = 11; // 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 = 100; // 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 3 (b) line 2 (c) line 4 (d) line 1
17. 17.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
18. 18.⚙️ What number does this app show?
    let bill = 51; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) speaking a command (d) working out a tip
21. 21.Which of these is an input? (a) a buzz (vibration) (b) checking a password (c) taking a photo (d) sorting the scores
22. 22.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) tapping a button (d) a result on screen
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 3 (b) line 1 (c) line 2 (d) line 4
25. 25.Which of these is an output? (a) tapping a button (b) checking a password (c) a buzz (vibration) (d) adding up a bill
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
27. 27.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 100; // 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 4 (b) line 3 (c) line 2 (d) line 1
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 22; // 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 2 (b) line 3 (c) line 4 (d) line 1
30. 30.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) adding up a bill
31. 31.⚙️ What number does this app show?
    let price = 150; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
33. 33.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) working out a tip (d) a result on screen
34. 34.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
35. 35.True or false: checking a password is an output. (a) False (b) True
36. 36.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
39. 39.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
40. 40.True or false: a result on screen is an output. (a) False (b) True

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