App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 435 · 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.True or false: taking a photo is an input. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let bill = 20; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 190; // 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 1 (c) line 2 (d) line 3
4. 4.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
5. 5.🔍 Which is the odd one out? (a) typing your age (b) checking a password (c) sorting the scores (d) adding up a bill
6. 6.⚙️ What number does this app show?
   let price = 65; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.True or false: a buzz (vibration) is an input. (a) True (b) False
8. 8.⚙️ What number does this app show?
   let km = 7; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) taking a photo (d) checking a password
10. 10.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 310; // 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 3 (b) line 4 (c) line 1 (d) line 2
12. 12.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) tapping a button (d) a result on screen
13. 13.Which of these is an input? (a) tapping a button (b) a result on screen (c) adding up a bill (d) a buzz (vibration)
14. 14.Which of these is an output? (a) sorting the scores (b) a beep sound (c) taking a photo (d) typing your age
15. 15.Which of these is an input? (a) working out a tip (b) taking a photo (c) a beep sound (d) a result on screen
16. 16.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
18. 18.True or false: checking a password is an input. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let price = 580; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.Which of these is an input? (a) speaking a command (b) working out a tip (c) sorting the scores (d) a result on screen
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 1 (b) line 3 (c) line 2 (d) line 4
22. 22.⚙️ What number does this app show?
    let bill = 130; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
24. 24.True or false: typing your age is an input. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) typing your age (d) taking a photo
26. 26.🔍 Which is the odd one out? (a) a pop-up message (b) speaking a command (c) taking a photo (d) typing your age
27. 27.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
28. 28.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
30. 30.True or false: a beep sound is an output. (a) True (b) False
31. 31.True or false: a pop-up message is an output. (a) True (b) False
32. 32.⚙️ 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 2 (b) line 1 (c) line 3
33. 33.True or false: sorting the scores is an output. (a) False (b) True
34. 34.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
35. 35.True or false: speaking a command is an input. (a) False (b) True
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
37. 37.⚙️ What number does this app show?
    let bill = 219; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.True or false: adding up a bill is an input. (a) False (b) True
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 2 (c) line 3 (d) line 1
40. 40.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);

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