App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 835 · 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 price = 25; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
2. 2.Which of these is processing? (a) tapping a button (b) a result on screen (c) adding up a bill (d) typing your age
3. 3.Which of these is an input? (a) typing your age (b) a beep sound (c) checking a password (d) a result on screen
4. 4.⚙️ What number does this app show?
   let price = 450; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.Which of these is an output? (a) sorting the scores (b) tapping a button (c) checking a password (d) a beep sound
6. 6.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) tapping a button (d) a beep sound
7. 7.True or false: speaking a command is an input. (a) True (b) False
8. 8.True or false: typing your age is an output. (a) True (b) False
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 256; // 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 2 (b) line 4 (c) line 3 (d) line 1
10. 10.True or false: adding up a bill is processing. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) adding up a bill (d) taking a photo
12. 12.⚙️ 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 3 (c) line 2
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 370; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 4 (c) line 1 (d) line 3
14. 14.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
15. 15.True or false: a beep sound is an input. (a) False (b) True
16. 16.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
17. 17.⚙️ What number does this app show?
    let bill = 84; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.⚙️ 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);
19. 19.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
20. 20.Which of these is an output? (a) adding up a bill (b) a pop-up message (c) working out a tip (d) taking a photo
21. 21.True or false: a buzz (vibration) is an output. (a) False (b) True
22. 22.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
23. 23.True or false: sorting the scores is an output. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) typing your age (d) adding up a bill
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // 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 1 (b) line 4 (c) line 3 (d) line 2
26. 26.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a buzz (vibration) (d) speaking a command
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
29. 29.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
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 output? (a) speaking a command (b) a result on screen (c) working out a tip (d) checking a password
32. 32.⚙️ What number does this app show?
    let bill = 304; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.⚙️ 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 2 (b) line 3 (c) line 1
34. 34.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
35. 35.True or false: typing your age is processing. (a) False (b) True
36. 36.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
37. 37.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) a buzz (vibration)
38. 38.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.Which of these is an output? (a) adding up a bill (b) typing your age (c) a buzz (vibration) (d) sorting the scores
40. 40.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output

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