App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 164 · 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 bill = 148; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ What number does this app show?
   let km = 13; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.Which of these is an input? (a) working out a tip (b) a beep sound (c) typing your age (d) a buzz (vibration)
4. 4.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 108; // typed by the user
   line 2: let friends = 3; // 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
6. 6.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
7. 7.Which of these is an output? (a) tapping a button (b) typing your age (c) speaking a command (d) a result on screen
8. 8.True or false: tapping a button is an input. (a) False (b) True
9. 9.True or false: adding up a bill is an input. (a) False (b) True
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 110; // 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
11. 11.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) taking a photo (d) a beep sound
12. 12.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
14. 14.True or false: taking a photo is an output. (a) True (b) False
15. 15.Which of these is an input? (a) sorting the scores (b) taking a photo (c) a buzz (vibration) (d) working out a tip
16. 16.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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
18. 18.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
19. 19.Which of these is an output? (a) adding up a bill (b) tapping a button (c) speaking a command (d) a pop-up message
20. 20.⚙️ What number does this app show?
    let bill = 375; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
21. 21.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) checking a password (d) sorting the scores
22. 22.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ What number does this app show?
    let bill = 228; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 4 (b) line 2 (c) line 3 (d) line 1
26. 26.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
27. 27.True or false: checking a password is processing. (a) True (b) False
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 1 (b) line 4 (c) line 2 (d) line 3
29. 29.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) working out a tip (d) a beep sound
30. 30.Which of these is an input? (a) checking a password (b) a result on screen (c) working out a tip (d) speaking a command
31. 31.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) checking a password (d) sorting the scores
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 200; // 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 3 (c) line 4 (d) line 1
33. 33.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.⚙️ What number does this app show?
    let bill = 84; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 104; // 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 1 (b) line 4 (c) line 3 (d) line 2
36. 36.True or false: taking a photo is an input. (a) False (b) True
37. 37.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
38. 38.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.True or false: tapping a button is an output. (a) True (b) False
40. 40.Which of these is processing? (a) a beep sound (b) taking a photo (c) adding up a bill (d) typing your age

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