App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 359 · 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 km = 15; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.Which of these is an input? (a) a beep sound (b) working out a tip (c) typing your age (d) a result on screen
3. 3.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
4. 4.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
5. 5.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
6. 6.⚙️ What number does this app show?
   let price = 65; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
7. 7.True or false: a pop-up message is processing. (a) True (b) False
8. 8.Which of these is processing? (a) taking a photo (b) a buzz (vibration) (c) sorting the scores (d) typing your age
9. 9.⚙️ What number does this app show?
   let price = 100; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
11. 11.True or false: a result on screen is an input. (a) False (b) True
12. 12.Which of these is an output? (a) taking a photo (b) tapping a button (c) adding up a bill (d) a result on screen
13. 13.⚙️ What number does this app show?
    let bill = 94; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.Which of these is an output? (a) a pop-up message (b) sorting the scores (c) checking a password (d) speaking a command
15. 15.True or false: taking a photo is an output. (a) False (b) True
16. 16.True or false: tapping a button is an output. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) typing your age (d) working out a tip
18. 18.⚙️ What number does this app show?
    let bill = 66; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 2 (c) line 4 (d) line 1
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 3 (b) line 2 (c) line 1 (d) line 4
21. 21.True or false: taking a photo is processing. (a) False (b) True
22. 22.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
23. 23.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) typing your age (d) tapping a button
24. 24.Which of these is an output? (a) typing your age (b) sorting the scores (c) a beep sound (d) checking a password
25. 25.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
26. 26.True or false: a pop-up message is an input. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 201; // 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
28. 28.Which of these is an input? (a) adding up a bill (b) checking a password (c) taking a photo (d) a buzz (vibration)
29. 29.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) adding up a bill
30. 30.True or false: a beep sound is an input. (a) False (b) True
31. 31.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.True or false: typing your age is an input. (a) False (b) True
33. 33.True or false: a beep sound is an output. (a) True (b) False
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 128; // 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 3 (b) line 1 (c) line 2 (d) line 4
35. 35.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
37. 37.True or false: adding up a bill is an input. (a) False (b) True
38. 38.True or false: a buzz (vibration) is an output. (a) False (b) True
39. 39.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
40. 40.True or false: checking a password is processing. (a) True (b) False

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