App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 389 · 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 output. (a) True (b) False
2. 2.⚙️ What number does this app show?
   let price = 80; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
3. 3.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) a buzz (vibration) (d) speaking a command
4. 4.Which of these is an output? (a) a result on screen (b) taking a photo (c) adding up a bill (d) working out a tip
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // 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 1 (b) line 2 (c) line 4 (d) line 3
6. 6.Which of these is processing? (a) a buzz (vibration) (b) tapping a button (c) typing your age (d) working out a tip
7. 7.🔍 Which is the odd one out? (a) a pop-up message (b) sorting the scores (c) a result on screen (d) a buzz (vibration)
8. 8.⚙️ What number does this app show?
   let km = 15; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
10. 10.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
11. 11.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) checking a password (d) typing your age
12. 12.Which of these is processing? (a) speaking a command (b) sorting the scores (c) a result on screen (d) typing your age
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 380; // 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
14. 14.True or false: a buzz (vibration) is an output. (a) False (b) True
15. 15.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
16. 16.⚙️ What number does this app show?
    let bill = 177; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.🔍 Which is the odd one out? (a) a buzz (vibration) (b) tapping a button (c) a beep sound (d) a pop-up message
18. 18.Which of these is processing? (a) speaking a command (b) adding up a bill (c) tapping a button (d) typing your age
19. 19.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
20. 20.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) tapping a button (d) taking a photo
21. 21.True or false: a result on screen is an output. (a) True (b) False
22. 22.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
23. 23.Which of these is an input? (a) speaking a command (b) a beep sound (c) a buzz (vibration) (d) working out a tip
24. 24.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
25. 25.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
26. 26.Which of these is an input? (a) checking a password (b) a pop-up message (c) taking a photo (d) a result on screen
27. 27.True or false: tapping a button is an input. (a) True (b) False
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
29. 29.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
30. 30.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) a pop-up message (d) a beep sound
31. 31.⚙️ What number does this app show?
    let bill = 115; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.True or false: tapping a button is processing. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let bill = 210; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.True or false: checking a password is an output. (a) False (b) True
35. 35.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
36. 36.⚙️ 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 4 (b) line 2 (c) line 1 (d) line 3
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 50; // 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 1 (b) line 2 (c) line 4 (d) line 3
38. 38.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ 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 1 (b) line 2 (c) line 3

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