App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 254 · 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: working out a tip is an input. (a) True (b) False
2. 2.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
3. 3.⚙️ What number does this app show?
   let bill = 48; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.True or false: sorting the scores is an input. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) a result on screen (d) sorting the scores
6. 6.⚙️ 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 2 (b) line 3 (c) line 1
7. 7.⚙️ What number does this app show?
   let price = 35; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ What number does this app show?
   let price = 190; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.Which of these is an output? (a) a buzz (vibration) (b) working out a tip (c) tapping a button (d) typing your age
10. 10.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
11. 11.True or false: a buzz (vibration) is an output. (a) True (b) False
12. 12.⚙️ 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);
13. 13.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
14. 14.True or false: a beep sound is an output. (a) False (b) True
15. 15.Which of these is processing? (a) a pop-up message (b) a beep sound (c) adding up a bill (d) a result on screen
16. 16.Which of these is an output? (a) tapping a button (b) a result on screen (c) adding up a bill (d) speaking a command
17. 17.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) typing your age (d) a pop-up message
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
19. 19.Which of these is an input? (a) a result on screen (b) tapping a button (c) sorting the scores (d) checking a password
20. 20.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
21. 21.True or false: adding up a bill is an output. (a) False (b) True
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 460; // 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 2 (c) line 1 (d) line 3
23. 23.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) adding up a bill
24. 24.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
25. 25.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
26. 26.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
27. 27.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) sorting the scores (d) checking a password
28. 28.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
29. 29.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
30. 30.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) taking a photo (d) working out a tip
31. 31.Which of these is processing? (a) speaking a command (b) tapping a button (c) a beep sound (d) checking a password
32. 32.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
33. 33.True or false: adding up a bill is processing. (a) False (b) True
34. 34.True or false: typing your age is processing. (a) False (b) True
35. 35.⚙️ What number does this app show?
    let price = 120; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.Which of these is processing? (a) a beep sound (b) tapping a button (c) sorting the scores (d) a pop-up message
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 4 (b) line 2 (c) line 1 (d) line 3
38. 38.⚙️ What number does this app show?
    let bill = 228; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.🔍 Which is the odd one out? (a) checking a password (b) a pop-up message (c) a beep sound (d) a result on screen
40. 40.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);

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