App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 751 · 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 of these is an output? (a) checking a password (b) tapping a button (c) a result on screen (d) adding up a bill
2. 2.🔍 Which is the odd one out? (a) working out a tip (b) a beep sound (c) a pop-up message (d) a result on screen
3. 3.⚙️ What number does this app show?
   let price = 30; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 9; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
5. 5.True or false: a buzz (vibration) is an output. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) adding up a bill (b) speaking a command (c) sorting the scores (d) checking a password
7. 7.Which of these is an input? (a) typing your age (b) checking a password (c) a pop-up message (d) sorting the scores
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 540; // 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 2 (d) line 3
9. 9.⚙️ What number does this app show?
   let price = 65; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
11. 11.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
12. 12.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
14. 14.Which of these is an input? (a) sorting the scores (b) tapping a button (c) checking a password (d) a result on screen
15. 15.Which of these is processing? (a) taking a photo (b) a buzz (vibration) (c) typing your age (d) checking a password
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 300; // 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 1 (c) line 2 (d) line 4
17. 17.Which of these is an input? (a) adding up a bill (b) speaking a command (c) checking a password (d) working out a tip
18. 18.⚙️ 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 4 (d) line 1
19. 19.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) tapping a button (d) speaking a command
20. 20.Which of these is processing? (a) a result on screen (b) typing your age (c) taking a photo (d) working out a tip
21. 21.True or false: typing your age is an output. (a) False (b) True
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
24. 24.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) adding up a bill (d) a result on screen
25. 25.True or false: speaking a command is processing. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) a beep sound (d) adding up a bill
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 2 (b) line 4 (c) line 1 (d) line 3
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 150; // 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 1 (b) line 4 (c) line 3 (d) line 2
29. 29.⚙️ What number does this app show?
    let bill = 304; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ 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 1 (b) line 2 (c) line 3
31. 31.⚙️ 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 2 (b) line 3 (c) line 4 (d) line 1
32. 32.Which of these is an output? (a) tapping a button (b) sorting the scores (c) a beep sound (d) working out a tip
33. 33.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) taking a photo (d) a result on screen
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 3 (c) line 4 (d) line 2
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // 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 2 (b) line 4 (c) line 1 (d) line 3
36. 36.Which of these is processing? (a) a pop-up message (b) sorting the scores (c) tapping a button (d) a buzz (vibration)
37. 37.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 1 (c) line 3 (d) line 2
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 1 (b) line 3 (c) line 4 (d) line 2
40. 40.⚙️ What number does this app show?
    let bill = 212; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);

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