App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 718 · 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: a result on screen is processing. (a) False (b) True
2. 2.Which of these is processing? (a) a result on screen (b) adding up a bill (c) typing your age (d) speaking a command
3. 3.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) working out a tip (d) speaking a command
4. 4.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) sorting the scores (d) adding up a bill
5. 5.Which of these is an output? (a) checking a password (b) taking a photo (c) working out a tip (d) a pop-up message
6. 6.Which of these is processing? (a) working out a tip (b) typing your age (c) tapping a button (d) speaking a command
7. 7.True or false: speaking a command is an input. (a) False (b) True
8. 8.⚙️ What number does this app show?
   let bill = 265; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ What number does this app show?
   let price = 110; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.True or false: a result on screen is an output. (a) False (b) True
11. 11.⚙️ What number does this app show?
    let bill = 305; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // 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
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 385; // 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 4 (c) line 1 (d) line 3
14. 14.Which of these is an output? (a) taking a photo (b) tapping a button (c) a beep sound (d) adding up a bill
15. 15.Which of these is an input? (a) a buzz (vibration) (b) a result on screen (c) typing your age (d) a beep sound
16. 16.⚙️ What number does this app show?
    let bill = 74; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.⚙️ 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);
18. 18.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) a pop-up message
19. 19.🔍 Which is the odd one out? (a) speaking a command (b) working out a tip (c) tapping a button (d) typing your age
20. 20.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 110; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 4 (c) line 1 (d) line 3
23. 23.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) a result on screen
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 156; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 4 (c) line 1 (d) line 3
26. 26.True or false: typing your age is an input. (a) True (b) False
27. 27.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
28. 28.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
29. 29.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
30. 30.Which of these is processing? (a) a result on screen (b) tapping a button (c) checking a password (d) taking a photo
31. 31.True or false: taking a photo is processing. (a) True (b) False
32. 32.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
33. 33.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
35. 35.🔍 Which is the odd one out? (a) a result on screen (b) sorting the scores (c) a beep sound (d) a pop-up message
36. 36.True or false: adding up a bill is an output. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) a buzz (vibration) (d) adding up a bill
38. 38.True or false: a beep sound is an output. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
40. 40.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);

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