App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 7 · 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 is the odd one out? (a) taking a photo (b) tapping a button (c) speaking a command (d) a pop-up message
2. 2.⚙️ What number does this app show?
   let price = 250; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.⚙️ 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 3 (c) line 2
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 80; // 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 4 (b) line 3 (c) line 1 (d) line 2
5. 5.⚙️ What number does this app show?
   let price = 110; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 11; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
7. 7.⚙️ What number does this app show?
   let price = 50; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
8. 8.True or false: a result on screen is processing. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) working out a tip (d) taking a photo
10. 10.⚙️ 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);
11. 11.True or false: typing your age is an input. (a) False (b) True
12. 12.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) working out a tip (d) typing your age
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // 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 3 (b) line 2 (c) line 4 (d) line 1
14. 14.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
15. 15.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
16. 16.True or false: typing your age is an output. (a) True (b) False
17. 17.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
19. 19.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
20. 20.True or false: tapping a button is an input. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
23. 23.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.Which of these is an output? (a) taking a photo (b) typing your age (c) a result on screen (d) speaking a command
25. 25.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 3 (b) line 2 (c) line 1 (d) line 4
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 4 (b) line 2 (c) line 3 (d) line 1
28. 28.Which of these is processing? (a) a result on screen (b) tapping a button (c) typing your age (d) adding up a bill
29. 29.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
30. 30.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) checking a password
31. 31.True or false: checking a password is an input. (a) False (b) True
32. 32.True or false: sorting the scores is processing. (a) True (b) False
33. 33.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
35. 35.Which of these is processing? (a) tapping a button (b) a pop-up message (c) sorting the scores (d) taking a photo
36. 36.🔍 Which is the odd one out? (a) tapping a button (b) working out a tip (c) sorting the scores (d) adding up a bill
37. 37.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) typing your age (d) a beep sound
38. 38.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) a beep sound (d) checking a password
40. 40.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);

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