App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 288 · 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.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
2. 2.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
3. 3.True or false: working out a tip is an input. (a) False (b) True
4. 4.Which of these is an input? (a) a beep sound (b) taking a photo (c) working out a tip (d) a result on screen
5. 5.Which of these is an output? (a) working out a tip (b) adding up a bill (c) a buzz (vibration) (d) speaking a command
6. 6.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
7. 7.Which of these is an output? (a) a beep sound (b) tapping a button (c) adding up a bill (d) speaking a command
8. 8.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
9. 9.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) a result on screen (d) a pop-up message
10. 10.True or false: a beep sound is an output. (a) False (b) True
11. 11.Which of these is processing? (a) a buzz (vibration) (b) speaking a command (c) sorting the scores (d) a result on screen
12. 12.True or false: a result on screen is an input. (a) False (b) True
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // 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 4 (b) line 2 (c) line 1 (d) line 3
14. 14.Which of these is an output? (a) a result on screen (b) speaking a command (c) checking a password (d) sorting the scores
15. 15.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) speaking a command (d) tapping a button
16. 16.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 1 (b) line 2 (c) line 4 (d) line 3
18. 18.🔍 Which is the odd one out? (a) adding up a bill (b) a pop-up message (c) working out a tip (d) sorting the scores
19. 19.⚙️ 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 3 (b) line 2 (c) line 1
20. 20.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
21. 21.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) a result on screen (d) adding up a bill
23. 23.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
24. 24.True or false: tapping a button is an input. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) checking a password
26. 26.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.True or false: working out a tip is processing. (a) False (b) True
28. 28.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
29. 29.⚙️ 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 3 (c) line 1
30. 30.🔍 Which is the odd one out? (a) a beep sound (b) sorting the scores (c) a result on screen (d) a pop-up message
31. 31.🔍 Which is the odd one out? (a) taking a photo (b) a pop-up message (c) a beep sound (d) a buzz (vibration)
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 4 (c) line 2 (d) line 1
33. 33.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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
35. 35.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
36. 36.True or false: checking a password is processing. (a) False (b) True
37. 37.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 1 (c) line 2 (d) line 4
39. 39.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2

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