App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 489 · 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 of these is an input? (a) sorting the scores (b) adding up a bill (c) taking a photo (d) checking a password
2. 2.Which of these is an input? (a) a buzz (vibration) (b) a pop-up message (c) typing your age (d) sorting the scores
3. 3.Which of these is an input? (a) adding up a bill (b) speaking a command (c) a buzz (vibration) (d) sorting the scores
4. 4.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
5. 5.Which of these is an output? (a) tapping a button (b) checking a password (c) a result on screen (d) typing your age
6. 6.True or false: a buzz (vibration) is processing. (a) True (b) False
7. 7.⚙️ 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);
8. 8.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) a result on screen (d) speaking a command
9. 9.True or false: checking a password is processing. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) typing your age (d) tapping a button
11. 11.True or false: typing your age is an output. (a) True (b) False
12. 12.⚙️ 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 1 (b) line 2 (c) line 3 (d) line 4
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 2 (b) line 3 (c) line 1 (d) line 4
14. 14.True or false: tapping a button is processing. (a) False (b) True
15. 15.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
16. 16.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ 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
18. 18.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a pop-up message (d) checking a password
19. 19.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) adding up a bill (d) tapping a button
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 520; // 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 4 (b) line 2 (c) line 3 (d) line 1
21. 21.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
22. 22.⚙️ What number does this app show?
    let bill = 231; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) a beep sound (d) tapping a button
24. 24.True or false: adding up a bill is processing. (a) False (b) True
25. 25.True or false: a result on screen is processing. (a) True (b) False
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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
27. 27.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
28. 28.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 95; // 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 4 (c) line 1 (d) line 3
30. 30.⚙️ What number does this app show?
    let bill = 320; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
32. 32.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
33. 33.⚙️ What number does this app show?
    let bill = 75; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.True or false: a beep sound is an output. (a) False (b) True
35. 35.True or false: a beep sound is an input. (a) False (b) True
36. 36.True or false: taking a photo is an input. (a) False (b) True
37. 37.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
38. 38.True or false: typing your age is an input. (a) False (b) True
39. 39.True or false: a pop-up message is an output. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) a pop-up message (d) a buzz (vibration)

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