App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 855 · 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 line does the processing (works out the answer)?
   line 1: let price = 240; // typed by the user
   line 2: let off = 20; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 3 (b) line 4 (c) line 2 (d) line 1
2. 2.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
3. 3.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
4. 4.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
5. 5.Which of these is an output? (a) checking a password (b) taking a photo (c) sorting the scores (d) a beep sound
6. 6.True or false: checking a password is an output. (a) False (b) True
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 60; // typed by the user
   line 2: let qty = 6; // 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
8. 8.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
9. 9.True or false: a buzz (vibration) is an output. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) a buzz (vibration) (d) tapping a button
11. 11.⚙️ 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);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 250; // 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 1 (b) line 2 (c) line 3 (d) line 4
13. 13.Which of these is an input? (a) working out a tip (b) checking a password (c) tapping a button (d) a buzz (vibration)
14. 14.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) typing your age (d) speaking a command
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
17. 17.True or false: sorting the scores is an input. (a) False (b) True
18. 18.⚙️ 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);
19. 19.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
21. 21.⚙️ What number does this app show?
    let bill = 92; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
23. 23.True or false: a beep sound is an output. (a) False (b) True
24. 24.Which of these is processing? (a) checking a password (b) a result on screen (c) a pop-up message (d) typing your age
25. 25.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
26. 26.True or false: typing your age is an output. (a) True (b) False
27. 27.True or false: working out a tip is an input. (a) True (b) False
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 520; // 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 1 (b) line 2 (c) line 4 (d) line 3
29. 29.True or false: tapping a button is an input. (a) True (b) False
30. 30.⚙️ What number does this app show?
    let price = 580; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a beep sound (d) checking a password
32. 32.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) adding up a bill (d) taking a photo
33. 33.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) checking a password (d) a beep sound
34. 34.Which of these is processing? (a) typing your age (b) taking a photo (c) adding up a bill (d) a buzz (vibration)
35. 35.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
36. 36.True or false: a result on screen is an input. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
39. 39.True or false: a beep sound is an input. (a) True (b) False
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 480; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2

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