App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 863 · 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 km = 13; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 70; // 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 2 (b) line 1 (c) line 3 (d) line 4
3. 3.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
4. 4.Which of these is an output? (a) a result on screen (b) tapping a button (c) sorting the scores (d) working out a tip
5. 5.⚙️ What number does this app show?
   let price = 45; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
6. 6.🔍 Which is the odd one out? (a) adding up a bill (b) typing your age (c) working out a tip (d) checking a password
7. 7.True or false: tapping a button is an output. (a) False (b) True
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 370; // 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 2 (b) line 3 (c) line 1 (d) line 4
9. 9.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
10. 10.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
11. 11.True or false: checking a password is processing. (a) False (b) True
12. 12.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.Which of these is an output? (a) checking a password (b) tapping a button (c) a beep sound (d) taking a photo
14. 14.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) checking a password (d) tapping a button
15. 15.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
16. 16.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
18. 18.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
19. 19.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) a result on screen
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 228; // 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 1 (c) line 4 (d) line 3
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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
22. 22.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.🔍 Which is the odd one out? (a) a buzz (vibration) (b) sorting the scores (c) a beep sound (d) a pop-up message
24. 24.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
25. 25.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) sorting the scores (d) a pop-up message
26. 26.True or false: a buzz (vibration) is processing. (a) False (b) True
27. 27.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
28. 28.Which of these is processing? (a) adding up a bill (b) a pop-up message (c) a beep sound (d) typing your age
29. 29.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 272; // 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
31. 31.True or false: a result on screen is processing. (a) True (b) False
32. 32.True or false: tapping a button is processing. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) a pop-up message (b) adding up a bill (c) a beep sound (d) a buzz (vibration)
34. 34.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.Which of these is an input? (a) a pop-up message (b) sorting the scores (c) tapping a button (d) checking a password
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
37. 37.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // 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
39. 39.Which of these is processing? (a) a result on screen (b) taking a photo (c) a beep sound (d) checking a password
40. 40.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) taking a photo (d) adding up a bill

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