App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 182 · 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 line does the processing (works out the answer)?
   line 1: let price = 460; // 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 3 (b) line 1 (c) line 4 (d) line 2
2. 2.⚙️ 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 3 (b) line 2 (c) line 1
3. 3.Which of these is an output? (a) taking a photo (b) adding up a bill (c) a result on screen (d) speaking a command
4. 4.Which of these is processing? (a) typing your age (b) sorting the scores (c) tapping a button (d) a beep sound
5. 5.True or false: a buzz (vibration) is processing. (a) True (b) False
6. 6.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 10; // 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 3 (d) line 1
8. 8.⚙️ What number does this app show?
   let bill = 72; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) a pop-up message (d) checking a password
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // 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 1 (c) line 3 (d) line 4
11. 11.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: sorting the scores is processing. (a) False (b) True
13. 13.Which of these is processing? (a) typing your age (b) working out a tip (c) a result on screen (d) a pop-up message
14. 14.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
15. 15.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 440; // 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 3 (b) line 1 (c) line 2 (d) line 4
17. 17.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) tapping a button (d) speaking a command
18. 18.🔍 Which is the odd one out? (a) working out a tip (b) speaking a command (c) typing your age (d) tapping a button
19. 19.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
20. 20.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
21. 21.Which of these is an output? (a) working out a tip (b) a beep sound (c) speaking a command (d) sorting the scores
22. 22.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
23. 23.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.True or false: a pop-up message is an output. (a) True (b) False
25. 25.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.True or false: checking a password is an output. (a) False (b) True
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 86; // 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 3 (c) line 4 (d) line 1
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
29. 29.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) typing your age (d) a buzz (vibration)
30. 30.⚙️ What number does this app show?
    let bill = 213; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
32. 32.True or false: a beep sound is an input. (a) False (b) True
33. 33.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
34. 34.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.⚙️ In an app, is working out a tip 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 = 100; // 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 1 (c) line 4 (d) line 3
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 92; // 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
38. 38.Which of these is an input? (a) checking a password (b) a buzz (vibration) (c) a pop-up message (d) tapping a button
39. 39.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) a pop-up message (d) a buzz (vibration)
40. 40.True or false: working out a tip is an output. (a) False (b) True

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