App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 649 · 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 bill = 44; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.🔍 Which is the odd one out? (a) adding up a bill (b) a pop-up message (c) a buzz (vibration) (d) a beep sound
3. 3.⚙️ What number does this app show?
   let km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.True or false: a result on screen is an output. (a) True (b) False
5. 5.True or false: a result on screen is processing. (a) True (b) False
6. 6.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 124; // 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 3 (b) line 4 (c) line 2 (d) line 1
8. 8.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
9. 9.Which of these is an output? (a) taking a photo (b) speaking a command (c) adding up a bill (d) a pop-up message
10. 10.🔍 Which is the odd one out? (a) a pop-up message (b) working out a tip (c) sorting the scores (d) adding up a bill
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 3 (b) line 1 (c) line 4 (d) line 2
12. 12.Which of these is an input? (a) a result on screen (b) checking a password (c) a beep sound (d) speaking a command
13. 13.True or false: tapping a button is an input. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) typing your age (b) a beep sound (c) a result on screen (d) a pop-up message
15. 15.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
16. 16.True or false: sorting the scores is processing. (a) False (b) True
17. 17.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 290; // 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 4 (b) line 3 (c) line 2 (d) line 1
20. 20.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
22. 22.Which of these is an output? (a) tapping a button (b) adding up a bill (c) a beep sound (d) speaking a command
23. 23.Which of these is an input? (a) a pop-up message (b) working out a tip (c) checking a password (d) tapping a button
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 111; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 4 (c) line 1 (d) line 2
25. 25.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
26. 26.True or false: a pop-up message is an output. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) a pop-up message (d) a result on screen
28. 28.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 3 (c) line 2 (d) line 1
30. 30.Which of these is an input? (a) adding up a bill (b) a result on screen (c) typing your age (d) sorting the scores
31. 31.Which of these is an input? (a) working out a tip (b) taking a photo (c) checking a password (d) a beep sound
32. 32.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
33. 33.True or false: checking a password is processing. (a) False (b) True
34. 34.⚙️ 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 3 (b) line 2 (c) line 1
35. 35.Which of these is processing? (a) taking a photo (b) typing your age (c) tapping a button (d) checking a password
36. 36.True or false: a buzz (vibration) is an input. (a) True (b) False
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 140; // 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 2 (d) line 1
38. 38.Which of these is an output? (a) a result on screen (b) tapping a button (c) checking a password (d) sorting the scores
39. 39.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);

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