App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 813 · 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 is the odd one out? (a) a pop-up message (b) adding up a bill (c) checking a password (d) working out a tip
2. 2.True or false: working out a tip is processing. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) taking a photo
4. 4.Which of these is processing? (a) taking a photo (b) a beep sound (c) a buzz (vibration) (d) working out a tip
5. 5.True or false: typing your age is an input. (a) False (b) True
6. 6.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ What number does this app show?
   let price = 35; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ What number does this app show?
   let price = 230; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.True or false: checking a password is an output. (a) False (b) True
10. 10.True or false: a result on screen is an output. (a) False (b) True
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 300; // 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 1 (b) line 4 (c) line 2 (d) line 3
12. 12.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
13. 13.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
14. 14.Which of these is an output? (a) speaking a command (b) typing your age (c) a beep sound (d) sorting the scores
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 140; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 4 (c) line 3 (d) line 2
16. 16.⚙️ What number does this app show?
    let price = 130; // 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 price = 20; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
18. 18.⚙️ 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
19. 19.⚙️ What number does this app show?
    let price = 490; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
21. 21.⚙️ What number does this app show?
    let bill = 365; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) tapping a button (d) a result on screen
23. 23.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) typing your age (d) tapping a button
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 1 (c) line 3 (d) line 4
25. 25.🔍 Which is the odd one out? (a) working out a tip (b) a beep sound (c) a pop-up message (d) a result on screen
26. 26.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
27. 27.⚙️ What number does this app show?
    let bill = 244; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.Which of these is an output? (a) a result on screen (b) taking a photo (c) sorting the scores (d) working out a tip
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // typed by the user
    line 2: let qty = 6; // 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
31. 31.True or false: a result on screen is an input. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) typing your age (d) a result on screen
33. 33.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ 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);
35. 35.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) sorting the scores (d) taking a photo
36. 36.Which of these is processing? (a) a result on screen (b) typing your age (c) checking a password (d) a beep sound
37. 37.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
38. 38.🔍 Which is the odd one out? (a) typing your age (b) working out a tip (c) sorting the scores (d) adding up a bill
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 550; // 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 2 (b) line 1 (c) line 3 (d) line 4
40. 40.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing

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