App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 865 · 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 = 60; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
2. 2.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) a result on screen
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
4. 4.⚙️ What number does this app show?
   let price = 120; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.⚙️ What number does this app show?
   let km = 15; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 40; // 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
7. 7.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // 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 2 (b) line 4 (c) line 3 (d) line 1
9. 9.True or false: typing your age is processing. (a) False (b) True
10. 10.Which of these is processing? (a) typing your age (b) checking a password (c) a result on screen (d) taking a photo
11. 11.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
12. 12.True or false: checking a password is processing. (a) True (b) False
13. 13.True or false: sorting the scores is processing. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) speaking a command (d) tapping a button
15. 15.True or false: checking a password is an input. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) typing your age (b) a buzz (vibration) (c) taking a photo (d) speaking a command
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 39; // 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 2 (c) line 3 (d) line 1
18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
19. 19.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
20. 20.True or false: tapping a button is an input. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 312; // 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 2 (b) line 4 (c) line 1 (d) line 3
23. 23.Which of these is an output? (a) taking a photo (b) checking a password (c) a pop-up message (d) typing your age
24. 24.⚙️ What number does this app show?
    let bill = 56; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.Which of these is processing? (a) a beep sound (b) a pop-up message (c) taking a photo (d) adding up a bill
26. 26.Which of these is an output? (a) checking a password (b) a beep sound (c) typing your age (d) working out a tip
27. 27.True or false: a result on screen is an output. (a) True (b) False
28. 28.True or false: a beep sound is an input. (a) True (b) False
29. 29.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
30. 30.Which of these is an input? (a) typing your age (b) a pop-up message (c) working out a tip (d) a result on screen
31. 31.True or false: working out a tip is processing. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) sorting the scores (d) a pop-up message
33. 33.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
34. 34.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) tapping a button (d) checking a password
35. 35.True or false: a beep sound is an output. (a) True (b) False
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 330; // 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 1 (b) line 2 (c) line 4 (d) line 3
37. 37.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
38. 38.True or false: a result on screen is processing. (a) False (b) True
39. 39.True or false: taking a photo is an input. (a) False (b) True
40. 40.⚙️ What number does this app show?
    let price = 480; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);

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