App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 728 · 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 of these is an input? (a) typing your age (b) a pop-up message (c) a buzz (vibration) (d) a result on screen
2. 2.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) tapping a button (d) a buzz (vibration)
3. 3.⚙️ What number does this app show?
   let price = 15; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 165; // 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 2 (b) line 4 (c) line 3 (d) line 1
5. 5.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
6. 6.⚙️ 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 2 (b) line 1 (c) line 3
7. 7.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ 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);
9. 9.Which of these is processing? (a) tapping a button (b) taking a photo (c) speaking a command (d) working out a tip
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 310; // 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 1 (c) line 4 (d) line 3
11. 11.True or false: checking a password is processing. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) working out a tip (d) sorting the scores
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 276; // 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 2 (b) line 4 (c) line 3 (d) line 1
14. 14.🔍 Which is the odd one out? (a) typing your age (b) adding up a bill (c) speaking a command (d) tapping a button
15. 15.⚙️ What number does this app show?
    let bill = 58; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.True or false: a pop-up message is processing. (a) False (b) True
17. 17.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
18. 18.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
19. 19.Which of these is an output? (a) typing your age (b) taking a photo (c) sorting the scores (d) a pop-up message
20. 20.True or false: a beep sound is an output. (a) False (b) True
21. 21.⚙️ 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 2 (c) line 3
22. 22.True or false: a beep sound is processing. (a) False (b) True
23. 23.Which of these is an output? (a) checking a password (b) sorting the scores (c) a buzz (vibration) (d) adding up a bill
24. 24.Which of these is processing? (a) typing your age (b) a result on screen (c) taking a photo (d) sorting the scores
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 4 (b) line 2 (c) line 3 (d) line 1
26. 26.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
28. 28.🔍 Which is the odd one out? (a) a result on screen (b) working out a tip (c) sorting the scores (d) adding up a bill
29. 29.True or false: speaking a command is processing. (a) True (b) False
30. 30.True or false: adding up a bill is processing. (a) False (b) True
31. 31.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
32. 32.Which of these is an output? (a) speaking a command (b) tapping a button (c) checking a password (d) a result on screen
33. 33.⚙️ What number does this app show?
    let bill = 250; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
35. 35.⚙️ What number does this app show?
    let bill = 155; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.True or false: working out a tip is an input. (a) True (b) False
37. 37.True or false: a pop-up message is an output. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) working out a tip (b) taking a photo (c) checking a password (d) adding up a bill
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 292; // 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 3 (d) line 1
40. 40.True or false: taking a photo is processing. (a) False (b) True

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