App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 13 · 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 = 400; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.True or false: speaking a command is an input. (a) True (b) False
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
4. 4.Which of these is processing? (a) a buzz (vibration) (b) typing your age (c) sorting the scores (d) a pop-up message
5. 5.Which of these is an input? (a) a result on screen (b) adding up a bill (c) sorting the scores (d) tapping a button
6. 6.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
7. 7.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) typing your age (d) a result on screen
8. 8.True or false: a buzz (vibration) is an input. (a) False (b) True
9. 9.⚙️ What number does this app show?
   let price = 130; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 520; // 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
12. 12.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
13. 13.🔍 Which is the odd one out? (a) adding up a bill (b) a pop-up message (c) sorting the scores (d) checking a password
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // 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 1 (b) line 3 (c) line 2 (d) line 4
15. 15.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.⚙️ 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);
17. 17.⚙️ 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);
18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
19. 19.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
21. 21.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) checking a password
23. 23.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
24. 24.True or false: working out a tip is processing. (a) True (b) False
25. 25.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) working out a tip (d) adding up a bill
27. 27.True or false: checking a password is processing. (a) True (b) False
28. 28.Which of these is an output? (a) a buzz (vibration) (b) working out a tip (c) sorting the scores (d) typing your age
29. 29.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.True or false: a result on screen is processing. (a) False (b) True
32. 32.Which of these is an input? (a) a beep sound (b) sorting the scores (c) speaking a command (d) a pop-up message
33. 33.Which of these is an input? (a) checking a password (b) working out a tip (c) adding up a bill (d) typing your age
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
35. 35.⚙️ What number does this app show?
    let bill = 54; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
37. 37.True or false: taking a photo is processing. (a) True (b) False
38. 38.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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
40. 40.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);

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