App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 184 · 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.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 25; // typed by the user
   line 2: let qty = 4; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 1 (b) line 3 (c) line 2 (d) line 4
2. 2.⚙️ What number does this app show?
   let price = 50; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
3. 3.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
4. 4.True or false: taking a photo is processing. (a) True (b) False
5. 5.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
6. 6.🔍 Which is the odd one out? (a) speaking a command (b) checking a password (c) working out a tip (d) adding up a bill
7. 7.Which of these is an input? (a) typing your age (b) a beep sound (c) sorting the scores (d) adding up a bill
8. 8.⚙️ What number does this app show?
   let bill = 160; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ What number does this app show?
   let price = 95; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
10. 10.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) adding up a bill
11. 11.🔍 Which is the odd one out? (a) sorting the scores (b) taking a photo (c) checking a password (d) adding up a bill
12. 12.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) a beep sound (d) speaking a command
13. 13.Which of these is an input? (a) checking a password (b) speaking a command (c) adding up a bill (d) a result on screen
14. 14.True or false: speaking a command is an output. (a) True (b) False
15. 15.True or false: checking a password is an output. (a) True (b) False
16. 16.Which of these is processing? (a) taking a photo (b) tapping a button (c) checking a password (d) speaking a command
17. 17.Which of these is an output? (a) taking a photo (b) sorting the scores (c) a result on screen (d) adding up a bill
18. 18.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
19. 19.⚙️ What number does this app show?
    let bill = 104; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.True or false: adding up a bill is an input. (a) True (b) False
21. 21.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
22. 22.True or false: a beep sound is an input. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) a result on screen (d) taking a photo
24. 24.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) a buzz (vibration) (d) speaking a command
25. 25.True or false: typing your age is an input. (a) True (b) False
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 3 (c) line 4 (d) line 1
27. 27.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) tapping a button (d) typing your age
28. 28.⚙️ What number does this app show?
    let bill = 248; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.⚙️ What number does this app show?
    let bill = 64; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ What number does this app show?
    let bill = 42; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ 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 1 (c) line 4 (d) line 3
32. 32.Which of these is an input? (a) tapping a button (b) a pop-up message (c) sorting the scores (d) a beep sound
33. 33.True or false: a pop-up message is processing. (a) True (b) False
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 540; // 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 3 (b) line 4 (c) line 1 (d) line 2
35. 35.⚙️ 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 2 (c) line 3
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 3 (c) line 1 (d) line 4
37. 37.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.🔍 Which is the odd one out? (a) sorting the scores (b) typing your age (c) checking a password (d) adding up a bill
40. 40.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);

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