App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 869 · 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 processing. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) working out a tip (d) speaking a command
3. 3.True or false: working out a tip is processing. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) typing your age (d) a beep sound
5. 5.⚙️ What number does this app show?
   let bill = 150; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 4 (c) line 3 (d) line 2
7. 7.True or false: sorting the scores is processing. (a) True (b) False
8. 8.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 40; // 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 3 (d) line 4
10. 10.True or false: adding up a bill is an input. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a result on screen (b) checking a password (c) a pop-up message (d) a beep sound
12. 12.Which of these is an output? (a) checking a password (b) taking a photo (c) a beep sound (d) speaking a command
13. 13.Which of these is an output? (a) adding up a bill (b) checking a password (c) taking a photo (d) a buzz (vibration)
14. 14.⚙️ What number does this app show?
    let bill = 62; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.Which of these is an output? (a) checking a password (b) a pop-up message (c) typing your age (d) adding up a bill
16. 16.⚙️ 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 3 (b) line 1 (c) line 2
17. 17.True or false: a buzz (vibration) is an output. (a) True (b) False
18. 18.True or false: speaking a command is processing. (a) False (b) True
19. 19.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 88; // 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 1 (c) line 3 (d) line 2
21. 21.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
22. 22.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) working out a tip (d) a result on screen
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 3 (b) line 2 (c) line 4 (d) line 1
24. 24.Which of these is an input? (a) taking a photo (b) checking a password (c) a pop-up message (d) a result on screen
25. 25.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) typing your age (d) speaking a command
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 98; // 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
27. 27.Which of these is an input? (a) typing your age (b) a beep sound (c) sorting the scores (d) working out a tip
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
29. 29.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 44; // 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 2 (c) line 3 (d) line 1
31. 31.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a result on screen (d) typing your age
32. 32.Which of these is processing? (a) tapping a button (b) taking a photo (c) adding up a bill (d) speaking a command
33. 33.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // 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 4 (b) line 3 (c) line 1 (d) line 2
36. 36.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a result on screen (d) adding up a bill
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 290; // 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 2 (b) line 1 (c) line 4 (d) line 3
38. 38.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);

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