App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 581 · 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.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
2. 2.True or false: a pop-up message is an output. (a) False (b) True
3. 3.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
4. 4.True or false: speaking a command is an input. (a) True (b) False
5. 5.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
6. 6.⚙️ What number does this app show?
   let price = 95; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 36; // 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 2 (c) line 3 (d) line 4
8. 8.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) checking a password (d) a beep sound
9. 9.🔍 Which is the odd one out? (a) sorting the scores (b) tapping a button (c) speaking a command (d) taking a photo
10. 10.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
11. 11.🔍 Which is the odd one out? (a) typing your age (b) adding up a bill (c) speaking a command (d) tapping a button
12. 12.Which of these is an output? (a) typing your age (b) a buzz (vibration) (c) speaking a command (d) tapping a button
13. 13.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
14. 14.True or false: typing your age is processing. (a) True (b) False
15. 15.⚙️ 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);
16. 16.🔍 Which is the odd one out? (a) tapping a button (b) working out a tip (c) adding up a bill (d) checking a password
17. 17.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
19. 19.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.Which of these is an input? (a) adding up a bill (b) a buzz (vibration) (c) sorting the scores (d) speaking a command
21. 21.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
22. 22.True or false: typing your age is an input. (a) False (b) True
23. 23.⚙️ What number does this app show?
    let bill = 86; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ What number does this app show?
    let bill = 39; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.True or false: a beep sound is an input. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
28. 28.True or false: adding up a bill is an input. (a) False (b) True
29. 29.Which of these is an input? (a) working out a tip (b) a buzz (vibration) (c) typing your age (d) a beep sound
30. 30.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ What number does this app show?
    let price = 150; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
32. 32.Which of these is an input? (a) sorting the scores (b) taking a photo (c) working out a tip (d) adding up a bill
33. 33.Which of these is an output? (a) sorting the scores (b) a pop-up message (c) working out a tip (d) tapping a button
34. 34.Which of these is processing? (a) a result on screen (b) speaking a command (c) tapping a button (d) sorting the scores
35. 35.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a pop-up message (d) tapping a button
36. 36.True or false: taking a photo is an input. (a) True (b) False
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 110; // 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 2 (c) line 1 (d) line 4
38. 38.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.True or false: checking a password is processing. (a) False (b) True
40. 40.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing

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