App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 185 · 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 = 7; // 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 = 420; // 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 4 (c) line 3 (d) line 1
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 370; // 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 2 (b) line 1 (c) line 4 (d) line 3
4. 4.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
5. 5.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
6. 6.⚙️ What number does this app show?
   let price = 100; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.🔍 Which is the odd one out? (a) tapping a button (b) working out a tip (c) adding up a bill (d) checking a password
8. 8.⚙️ What number does this app show?
   let bill = 52; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ What number does this app show?
   let bill = 375; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 530; // 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 4 (b) line 2 (c) line 1 (d) line 3
11. 11.True or false: sorting the scores is an input. (a) False (b) True
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
13. 13.True or false: speaking a command is an input. (a) False (b) True
14. 14.True or false: a pop-up message is an output. (a) True (b) False
15. 15.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
16. 16.Which of these is an input? (a) a result on screen (b) working out a tip (c) a pop-up message (d) tapping a button
17. 17.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
18. 18.⚙️ What number does this app show?
    let bill = 300; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.Which of these is an input? (a) adding up a bill (b) typing your age (c) checking a password (d) a buzz (vibration)
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 4 (d) line 1
21. 21.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
22. 22.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) a result on screen
23. 23.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // typed by the user
    line 2: let off = 10; // 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
25. 25.Which of these is an output? (a) sorting the scores (b) taking a photo (c) checking a password (d) a result on screen
26. 26.True or false: checking a password is an input. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a beep sound (d) sorting the scores
28. 28.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) adding up a bill (d) taking a photo
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 2 (b) line 4 (c) line 3 (d) line 1
31. 31.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a beep sound (d) typing your age
32. 32.⚙️ 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);
33. 33.True or false: typing your age is processing. (a) True (b) False
34. 34.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
37. 37.Which of these is processing? (a) a beep sound (b) taking a photo (c) speaking a command (d) sorting the scores
38. 38.True or false: sorting the scores is an output. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) taking a photo (d) checking a password
40. 40.True or false: working out a tip is an input. (a) False (b) True

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