App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 287 · 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 bill = 84; // 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
2. 2.True or false: tapping a button is processing. (a) True (b) False
3. 3.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
4. 4.Which of these is processing? (a) speaking a command (b) typing your age (c) checking a password (d) tapping a button
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 15; // 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 3 (b) line 1 (c) line 2 (d) line 4
6. 6.True or false: adding up a bill is processing. (a) False (b) True
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
8. 8.⚙️ What number does this app show?
   let km = 13; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.⚙️ What number does this app show?
   let price = 230; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.True or false: a result on screen is an input. (a) True (b) False
11. 11.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) adding up a bill
12. 12.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
13. 13.⚙️ What number does this app show?
    let bill = 150; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
15. 15.True or false: taking a photo is an output. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a result on screen (d) speaking a command
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 4 (b) line 1 (c) line 3 (d) line 2
18. 18.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
19. 19.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 390; // 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 2 (b) line 3 (c) line 1 (d) line 4
21. 21.⚙️ 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 2 (b) line 1 (c) line 3
22. 22.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a result on screen (d) sorting the scores
23. 23.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
24. 24.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
26. 26.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a beep sound (d) tapping a button
27. 27.🔍 Which is the odd one out? (a) typing your age (b) checking a password (c) adding up a bill (d) working out a tip
28. 28.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
29. 29.Which of these is an output? (a) tapping a button (b) speaking a command (c) a beep sound (d) checking a password
30. 30.True or false: typing your age is an output. (a) False (b) True
31. 31.⚙️ 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);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 4 (b) line 2 (c) line 3 (d) line 1
33. 33.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
34. 34.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.True or false: sorting the scores is an input. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.🔍 Which is the odd one out? (a) typing your age (b) a pop-up message (c) tapping a button (d) speaking a command
38. 38.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
39. 39.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ What number does this app show?
    let bill = 76; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);

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