App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 445 · 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 bill = 244; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.True or false: a beep sound is an input. (a) True (b) False
3. 3.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
4. 4.Which of these is an input? (a) a result on screen (b) tapping a button (c) a pop-up message (d) checking a password
5. 5.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
6. 6.Which of these is processing? (a) taking a photo (b) working out a tip (c) typing your age (d) a pop-up message
7. 7.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
8. 8.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
9. 9.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
10. 10.⚙️ 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);
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 50; // 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 3 (c) line 2 (d) line 4
12. 12.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
13. 13.⚙️ 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);
14. 14.🔍 Which is the odd one out? (a) sorting the scores (b) a result on screen (c) adding up a bill (d) checking a password
15. 15.⚙️ What number does this app show?
    let bill = 148; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.True or false: typing your age is an output. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) checking a password (d) typing your age
18. 18.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
19. 19.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) checking a password (d) taking a photo
21. 21.Which of these is processing? (a) tapping a button (b) a result on screen (c) a beep sound (d) adding up a bill
22. 22.True or false: adding up a bill is an input. (a) False (b) True
23. 23.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
24. 24.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
25. 25.Which of these is an output? (a) typing your age (b) tapping a button (c) a result on screen (d) checking a password
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 1 (b) line 2 (c) line 4 (d) line 3
27. 27.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.True or false: a pop-up message is an output. (a) True (b) False
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
30. 30.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) typing your age (d) taking a photo
31. 31.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
32. 32.True or false: a result on screen is an output. (a) False (b) True
33. 33.⚙️ What number does this app show?
    let bill = 130; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
35. 35.⚙️ 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 4 (b) line 1 (c) line 3 (d) line 2
36. 36.⚙️ What number does this app show?
    let bill = 230; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.True or false: taking a photo is processing. (a) True (b) False
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 180; // 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 1 (b) line 2 (c) line 4 (d) line 3
39. 39.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2

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