App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 367 · 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 = 430; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ What number does this app show?
   let km = 10; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.Which of these is an input? (a) speaking a command (b) sorting the scores (c) working out a tip (d) checking a password
4. 4.⚙️ 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 3 (b) line 2 (c) line 1
5. 5.True or false: taking a photo is processing. (a) True (b) False
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // typed by the user
   line 2: let qty = 2; // 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
7. 7.⚙️ What number does this app show?
   let bill = 52; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 470; // typed by the user
   line 2: let off = 10; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 1 (b) line 3 (c) line 2 (d) line 4
9. 9.⚙️ What number does this app show?
   let km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.Which of these is an input? (a) a pop-up message (b) adding up a bill (c) typing your age (d) checking a password
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 160; // 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 4 (b) line 1 (c) line 2 (d) line 3
12. 12.Which of these is processing? (a) working out a tip (b) taking a photo (c) speaking a command (d) typing your age
13. 13.Which of these is an output? (a) sorting the scores (b) a buzz (vibration) (c) tapping a button (d) checking a password
14. 14.True or false: sorting the scores is an output. (a) True (b) False
15. 15.True or false: taking a photo is an output. (a) False (b) True
16. 16.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
17. 17.Which of these is an input? (a) working out a tip (b) a result on screen (c) taking a photo (d) sorting the scores
18. 18.⚙️ What number does this app show?
    let price = 350; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
20. 20.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.True or false: a beep sound is processing. (a) True (b) False
22. 22.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
23. 23.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) a result on screen
24. 24.True or false: adding up a bill is an input. (a) False (b) True
25. 25.⚙️ What number does this app show?
    let bill = 146; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.Which of these is processing? (a) adding up a bill (b) taking a photo (c) a buzz (vibration) (d) a pop-up message
27. 27.True or false: a pop-up message is an input. (a) False (b) True
28. 28.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
29. 29.🔍 Which is the odd one out? (a) typing your age (b) a pop-up message (c) a result on screen (d) a buzz (vibration)
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 120; // 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 4 (b) line 1 (c) line 2 (d) line 3
31. 31.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
32. 32.🔍 Which is the odd one out? (a) sorting the scores (b) speaking a command (c) adding up a bill (d) checking a password
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 66; // 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 4 (c) line 1 (d) line 3
34. 34.Which of these is an output? (a) adding up a bill (b) a result on screen (c) taking a photo (d) speaking a command
35. 35.Which of these is processing? (a) a buzz (vibration) (b) checking a password (c) a beep sound (d) a pop-up message
36. 36.True or false: a pop-up message is processing. (a) False (b) True
37. 37.True or false: sorting the scores is processing. (a) False (b) True
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 240; // 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 1 (b) line 2 (c) line 4 (d) line 3
39. 39.⚙️ 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);
40. 40.True or false: a pop-up message is an output. (a) False (b) True

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