App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 231 · 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) tapping a button (c) a pop-up message (d) speaking a command
2. 2.⚙️ What number does this app show?
   let price = 270; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.True or false: a result on screen is an output. (a) True (b) False
4. 4.⚙️ What number does this app show?
   let price = 15; // 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 = 24; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.True or false: a result on screen is an input. (a) False (b) True
7. 7.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
8. 8.True or false: a pop-up message is an input. (a) False (b) True
9. 9.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
10. 10.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
11. 11.True or false: typing your age is an input. (a) False (b) True
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 1 (d) line 3
13. 13.⚙️ What number does this app show?
    let bill = 190; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.Which of these is an input? (a) adding up a bill (b) tapping a button (c) sorting the scores (d) a result on screen
15. 15.True or false: speaking a command is processing. (a) False (b) True
16. 16.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
18. 18.🔍 Which is the odd one out? (a) a buzz (vibration) (b) adding up a bill (c) a pop-up message (d) a result on screen
19. 19.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.True or false: tapping a button is processing. (a) True (b) False
21. 21.Which of these is processing? (a) a pop-up message (b) typing your age (c) speaking a command (d) adding up a bill
22. 22.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
23. 23.True or false: adding up a bill is an input. (a) False (b) True
24. 24.⚙️ What number does this app show?
    let bill = 228; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.Which of these is processing? (a) working out a tip (b) typing your age (c) a beep sound (d) speaking a command
26. 26.Which of these is an input? (a) a beep sound (b) typing your age (c) adding up a bill (d) a buzz (vibration)
27. 27.True or false: speaking a command is an input. (a) True (b) False
28. 28.True or false: a beep sound is processing. (a) True (b) False
29. 29.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
30. 30.⚙️ What number does this app show?
    let bill = 56; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.Which of these is an input? (a) a result on screen (b) adding up a bill (c) a buzz (vibration) (d) speaking a command
32. 32.⚙️ 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);
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 340; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 2 (c) line 1 (d) line 3
34. 34.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
35. 35.Which of these is an output? (a) tapping a button (b) working out a tip (c) typing your age (d) a buzz (vibration)
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // 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 1 (b) line 4 (c) line 2 (d) line 3
37. 37.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
39. 39.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) taking a photo (d) sorting the scores
40. 40.True or false: taking a photo is an output. (a) True (b) False

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