App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 136 · 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 of these is an input? (a) a beep sound (b) a buzz (vibration) (c) taking a photo (d) a result on screen
2. 2.⚙️ 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 2 (c) line 3
3. 3.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
4. 4.Which of these is an input? (a) a result on screen (b) speaking a command (c) adding up a bill (d) checking a password
5. 5.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
6. 6.⚙️ What number does this app show?
   let bill = 204; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.True or false: checking a password is an output. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) working out a tip (d) taking a photo
9. 9.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a buzz (vibration) (d) typing your age
10. 10.True or false: tapping a button is processing. (a) True (b) False
11. 11.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
12. 12.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
13. 13.⚙️ What number does this app show?
    let price = 210; // 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) typing your age (b) speaking a command (c) a result on screen (d) tapping a button
15. 15.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.True or false: taking a photo is processing. (a) False (b) True
17. 17.True or false: checking a password is processing. (a) False (b) True
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
19. 19.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
20. 20.⚙️ 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 1 (b) line 2 (c) line 4 (d) line 3
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 3 (b) line 2 (c) line 1 (d) line 4
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 250; // 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 4 (b) line 1 (c) line 3 (d) line 2
23. 23.True or false: adding up a bill is an input. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) adding up a bill (b) a buzz (vibration) (c) checking a password (d) working out a tip
25. 25.True or false: a buzz (vibration) is processing. (a) True (b) False
26. 26.Which of these is an input? (a) checking a password (b) typing your age (c) a buzz (vibration) (d) sorting the scores
27. 27.⚙️ 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
28. 28.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
29. 29.🔍 Which is the odd one out? (a) checking a password (b) a beep sound (c) a result on screen (d) a buzz (vibration)
30. 30.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
31. 31.🔍 Which is the odd one out? (a) sorting the scores (b) a beep sound (c) working out a tip (d) adding up a bill
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 316; // 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 4 (b) line 1 (c) line 2 (d) line 3
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 147; // 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 4 (c) line 2 (d) line 3
34. 34.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) speaking a command (d) typing your age
35. 35.⚙️ 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);
36. 36.True or false: typing your age is processing. (a) False (b) True
37. 37.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.True or false: a buzz (vibration) is an output. (a) False (b) True
39. 39.Which of these is processing? (a) working out a tip (b) tapping a button (c) typing your age (d) a beep sound
40. 40.True or false: working out a tip is processing. (a) False (b) True

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