App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 757 · 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) typing your age (b) adding up a bill (c) tapping a button (d) speaking a command
2. 2.True or false: a pop-up message is an output. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) a result on screen (b) adding up a bill (c) working out a tip (d) checking a password
4. 4.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ What number does this app show?
   let bill = 136; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.Which of these is processing? (a) a pop-up message (b) a result on screen (c) tapping a button (d) adding up a bill
8. 8.⚙️ What number does this app show?
   let bill = 380; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) checking a password (d) a beep sound
10. 10.Which of these is an output? (a) a buzz (vibration) (b) tapping a button (c) adding up a bill (d) working out a tip
11. 11.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 3 (b) line 4 (c) line 1 (d) line 2
13. 13.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
14. 14.True or false: a pop-up message is processing. (a) False (b) True
15. 15.⚙️ What number does this app show?
    let bill = 115; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 170; // 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
17. 17.True or false: typing your age is processing. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) a buzz (vibration)
19. 19.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
20. 20.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.True or false: taking a photo is an input. (a) True (b) False
22. 22.True or false: a buzz (vibration) is an output. (a) True (b) False
23. 23.Which of these is an output? (a) a result on screen (b) tapping a button (c) working out a tip (d) speaking a command
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
25. 25.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 4 (d) line 3
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
28. 28.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
29. 29.True or false: speaking a command is an output. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) tapping a button (d) a buzz (vibration)
31. 31.Which of these is processing? (a) a buzz (vibration) (b) taking a photo (c) sorting the scores (d) tapping a button
32. 32.⚙️ What number does this app show?
    let price = 150; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
34. 34.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) taking a photo (d) a beep sound
35. 35.True or false: adding up a bill is an input. (a) False (b) True
36. 36.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ 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
39. 39.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) working out a tip (d) typing your age
40. 40.Which of these is an input? (a) taking a photo (b) checking a password (c) a result on screen (d) sorting the scores

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