App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 946 · 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.True or false: a pop-up message is an input. (a) True (b) False
2. 2.Which of these is an input? (a) working out a tip (b) a beep sound (c) typing your age (d) a result on screen
3. 3.⚙️ What number does this app show?
   let price = 240; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ What number does this app show?
   let price = 100; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
6. 6.⚙️ What number does this app show?
   let price = 220; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.⚙️ What number does this app show?
   let bill = 60; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) a result on screen (d) adding up a bill
9. 9.⚙️ What number does this app show?
   let bill = 116; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.Which of these is an output? (a) adding up a bill (b) a buzz (vibration) (c) sorting the scores (d) working out a tip
11. 11.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) a beep sound (d) checking a password
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 270; // 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 4 (c) line 3 (d) line 2
13. 13.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
14. 14.True or false: taking a photo is processing. (a) False (b) True
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // 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 4 (b) line 3 (c) line 2 (d) line 1
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 325; // 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 3 (b) line 4 (c) line 1 (d) line 2
17. 17.Which of these is processing? (a) typing your age (b) sorting the scores (c) a buzz (vibration) (d) tapping a button
18. 18.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) a buzz (vibration) (d) a pop-up message
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 2 (c) line 3 (d) line 4
20. 20.Which of these is processing? (a) tapping a button (b) a result on screen (c) typing your age (d) adding up a bill
21. 21.True or false: sorting the scores is processing. (a) False (b) True
22. 22.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ What number does this app show?
    let bill = 325; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.Which of these is an output? (a) a beep sound (b) tapping a button (c) checking a password (d) sorting the scores
26. 26.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) checking a password (d) working out a tip
27. 27.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
28. 28.⚙️ What number does this app show?
    let bill = 142; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.Which of these is an output? (a) sorting the scores (b) tapping a button (c) speaking a command (d) a result on screen
30. 30.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) working out a tip (d) speaking a command
31. 31.True or false: tapping a button is an input. (a) True (b) False
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 3 (b) line 4 (c) line 2 (d) line 1
33. 33.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) taking a photo (d) typing your age
34. 34.Which of these is an input? (a) working out a tip (b) adding up a bill (c) speaking a command (d) sorting the scores
35. 35.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 84; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 1 (c) line 4 (d) line 3
37. 37.True or false: checking a password is an input. (a) False (b) True
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 158; // 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 3 (b) line 4 (c) line 2 (d) line 1
39. 39.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 60; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 2 (c) line 4 (d) line 3

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