App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 837 · 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 = 102; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 95; // typed by the user
   line 2: let qty = 5; // 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
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 10; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
4. 4.⚙️ What number does this app show?
   let bill = 275; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 50; // 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 4 (c) line 1 (d) line 3
7. 7.Which of these is an input? (a) a beep sound (b) speaking a command (c) a result on screen (d) adding up a bill
8. 8.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) a pop-up message (d) adding up a bill
9. 9.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) adding up a bill (d) a buzz (vibration)
10. 10.🔍 Which is the odd one out? (a) sorting the scores (b) typing your age (c) taking a photo (d) speaking a command
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) typing your age (d) working out a tip
12. 12.True or false: a pop-up message is an input. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a result on screen (b) adding up a bill (c) sorting the scores (d) working out a tip
14. 14.Which of these is processing? (a) typing your age (b) tapping a button (c) a beep sound (d) checking a password
15. 15.True or false: speaking a command is an output. (a) False (b) True
16. 16.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 138; // 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 1 (b) line 4 (c) line 3 (d) line 2
18. 18.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
20. 20.Which of these is an output? (a) taking a photo (b) a result on screen (c) typing your age (d) adding up a bill
21. 21.Which of these is processing? (a) speaking a command (b) a result on screen (c) adding up a bill (d) a pop-up message
22. 22.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
23. 23.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
24. 24.True or false: taking a photo is an input. (a) False (b) True
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
26. 26.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) working out a tip (d) sorting the scores
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 168; // 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 1 (b) line 3 (c) line 4 (d) line 2
28. 28.True or false: typing your age is processing. (a) False (b) True
29. 29.True or false: a buzz (vibration) is processing. (a) False (b) True
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 144; // 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 1 (b) line 3 (c) line 2 (d) line 4
31. 31.Which of these is an output? (a) typing your age (b) a pop-up message (c) taking a photo (d) speaking a command
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (c) line 1 (d) line 3
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 400; // 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 1 (d) line 2
34. 34.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) checking a password (d) taking a photo
35. 35.Which of these is an input? (a) a result on screen (b) working out a tip (c) checking a password (d) taking a photo
36. 36.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) sorting the scores (d) working out a tip
37. 37.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
38. 38.True or false: a beep sound is an input. (a) True (b) False
39. 39.True or false: tapping a button is an output. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) tapping a button (b) a beep sound (c) speaking a command (d) typing your age

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