App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 497 · 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 price = 90; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
2. 2.Which of these is an input? (a) tapping a button (b) sorting the scores (c) a buzz (vibration) (d) a pop-up message
3. 3.Which of these is an output? (a) checking a password (b) typing your age (c) a buzz (vibration) (d) taking a photo
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 2 (c) line 1 (d) line 4
5. 5.⚙️ What number does this app show?
   let bill = 256; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) speaking a command (d) a pop-up message
7. 7.Which of these is an input? (a) a buzz (vibration) (b) adding up a bill (c) taking a photo (d) working out a tip
8. 8.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 55; // 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 4 (b) line 1 (c) line 3 (d) line 2
10. 10.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) taking a photo
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 210; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 1 (c) line 3 (d) line 4
12. 12.Which of these is an input? (a) a beep sound (b) typing your age (c) checking a password (d) adding up a bill
13. 13.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) a pop-up message (d) a beep sound
14. 14.Which of these is an output? (a) checking a password (b) taking a photo (c) working out a tip (d) a beep sound
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // 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 2 (c) line 1 (d) line 4
16. 16.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
19. 19.⚙️ 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);
20. 20.True or false: working out a tip is an input. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
22. 22.Which of these is processing? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) adding up a bill
23. 23.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
24. 24.True or false: tapping a button is an input. (a) False (b) True
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 104; // 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 3 (c) line 1 (d) line 2
26. 26.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) a pop-up message (d) working out a tip
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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
28. 28.True or false: checking a password is processing. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
30. 30.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ What number does this app show?
    let bill = 90; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 96; // 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 2 (c) line 1 (d) line 3
33. 33.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) a result on screen (d) checking a password
34. 34.⚙️ What number does this app show?
    let price = 350; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) typing your age (d) a result on screen
36. 36.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
38. 38.Which of these is an output? (a) tapping a button (b) adding up a bill (c) working out a tip (d) a result on screen
39. 39.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a buzz (vibration) (d) working out a tip
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 3 (b) line 2 (c) line 4 (d) line 1

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