App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 952 · 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 = 350; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.True or false: working out a tip is an output. (a) True (b) False
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 95; // typed by the user
   line 2: let qty = 5; // 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
4. 4.⚙️ What number does this app show?
   let price = 290; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) taking a photo
6. 6.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) a result on screen
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 285; // 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 3 (b) line 4 (c) line 1 (d) line 2
8. 8.Which of these is an output? (a) tapping a button (b) a pop-up message (c) adding up a bill (d) taking a photo
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 85; // 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 3 (b) line 1 (c) line 2 (d) line 4
10. 10.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) typing your age (d) a pop-up message
11. 11.⚙️ 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);
12. 12.⚙️ What number does this app show?
    let bill = 144; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.Which of these is an output? (a) taking a photo (b) sorting the scores (c) a beep sound (d) tapping a button
14. 14.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
16. 16.True or false: a pop-up message is an output. (a) True (b) False
17. 17.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
18. 18.True or false: tapping a button is an input. (a) False (b) True
19. 19.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
20. 20.🔍 Which is the odd one out? (a) a beep sound (b) typing your age (c) tapping a button (d) speaking a command
21. 21.Which of these is processing? (a) a beep sound (b) tapping a button (c) sorting the scores (d) a buzz (vibration)
22. 22.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
23. 23.⚙️ What number does this app show?
    let bill = 390; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ What number does this app show?
    let bill = 216; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
27. 27.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
28. 28.True or false: a result on screen is an output. (a) False (b) True
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // typed by the user
    line 2: let qty = 5; // 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
30. 30.True or false: taking a photo is an input. (a) False (b) True
31. 31.Which of these is an output? (a) sorting the scores (b) tapping a button (c) typing your age (d) a buzz (vibration)
32. 32.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
33. 33.⚙️ What number does this app show?
    let bill = 106; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a buzz (vibration) (d) taking a photo
35. 35.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 100; // 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 3 (b) line 1 (c) line 2 (d) line 4
37. 37.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) sorting the scores (d) a pop-up message
38. 38.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 4 (c) line 1 (d) line 3
40. 40.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input

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