App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 211 · 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.⚙️ What number does this app show?
   let price = 30; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
2. 2.Which of these is an input? (a) checking a password (b) working out a tip (c) tapping a button (d) sorting the scores
3. 3.True or false: tapping a button is an output. (a) True (b) False
4. 4.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
5. 5.True or false: working out a tip is processing. (a) False (b) True
6. 6.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 30; // typed by the user
   line 2: let qty = 4; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 3 (b) line 2 (c) line 1 (d) line 4
8. 8.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) adding up a bill (d) a pop-up message
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 141; // typed by the user
   line 2: let friends = 3; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 4 (b) line 3 (c) line 1 (d) line 2
10. 10.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: a beep sound is an input. (a) False (b) True
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 160; // 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 1 (b) line 3 (c) line 4 (d) line 2
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 255; // 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 1 (c) line 4 (d) line 3
15. 15.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
16. 16.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 124; // 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 1 (b) line 4 (c) line 3 (d) line 2
18. 18.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
19. 19.True or false: taking a photo is processing. (a) False (b) True
20. 20.True or false: a pop-up message is processing. (a) True (b) False
21. 21.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) speaking a command (d) a beep sound
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
24. 24.Which of these is an output? (a) a result on screen (b) speaking a command (c) adding up a bill (d) working out a tip
25. 25.🔍 Which is the odd one out? (a) tapping a button (b) working out a tip (c) checking a password (d) sorting the scores
26. 26.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.True or false: a buzz (vibration) is an input. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) a buzz (vibration) (b) checking a password (c) a result on screen (d) a beep sound
29. 29.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
31. 31.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
32. 32.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a beep sound (d) taking a photo
33. 33.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) taking a photo (d) a result on screen
34. 34.Which of these is processing? (a) a beep sound (b) speaking a command (c) a result on screen (d) checking a password
35. 35.True or false: typing your age is processing. (a) False (b) True
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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 1 (b) line 2 (c) line 4 (d) line 3
37. 37.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
38. 38.True or false: adding up a bill is processing. (a) False (b) True
39. 39.Which of these is an output? (a) typing your age (b) working out a tip (c) a beep sound (d) speaking a command
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 510; // 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 1 (b) line 4 (c) line 2 (d) line 3

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