App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 815 · 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 = 60; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
2. 2.⚙️ What number does this app show?
   let price = 580; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.🔍 Which is the odd one out? (a) a pop-up message (b) working out a tip (c) a buzz (vibration) (d) a result on screen
4. 4.Which of these is processing? (a) taking a photo (b) typing your age (c) sorting the scores (d) a beep sound
5. 5.⚙️ 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);
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 170; // 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 4 (b) line 2 (c) line 3 (d) line 1
7. 7.Which of these is processing? (a) checking a password (b) a pop-up message (c) typing your age (d) speaking a command
8. 8.True or false: sorting the scores is an input. (a) True (b) False
9. 9.True or false: speaking a command is an input. (a) True (b) False
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 4 (b) line 1 (c) line 3 (d) line 2
11. 11.True or false: a result on screen is processing. (a) True (b) False
12. 12.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
13. 13.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
14. 14.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
15. 15.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
16. 16.⚙️ 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 1 (b) line 3 (c) line 2
17. 17.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) adding up a bill
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 570; // 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 2 (b) line 1 (c) line 4 (d) line 3
19. 19.⚙️ 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 2 (b) line 1 (c) line 3
20. 20.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) speaking a command (d) typing your age
21. 21.True or false: working out a tip is an output. (a) True (b) False
22. 22.⚙️ What number does this app show?
    let bill = 96; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.Which of these is processing? (a) working out a tip (b) speaking a command (c) a beep sound (d) taking a photo
25. 25.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
26. 26.True or false: a result on screen is an output. (a) False (b) True
27. 27.⚙️ What number does this app show?
    let bill = 100; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.Which of these is an output? (a) typing your age (b) a buzz (vibration) (c) adding up a bill (d) speaking a command
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 1 (c) line 3 (d) line 4
30. 30.Which of these is an output? (a) tapping a button (b) working out a tip (c) a pop-up message (d) speaking a command
31. 31.Which of these is processing? (a) typing your age (b) a beep sound (c) adding up a bill (d) taking a photo
32. 32.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
33. 33.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // 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 4 (b) line 1 (c) line 2 (d) line 3
35. 35.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) tapping a button (d) checking a password
36. 36.⚙️ What number does this app show?
    let bill = 220; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.Which of these is an input? (a) checking a password (b) working out a tip (c) typing your age (d) a buzz (vibration)
38. 38.True or false: taking a photo is processing. (a) True (b) False
39. 39.Which of these is an output? (a) checking a password (b) working out a tip (c) a beep sound (d) tapping a button
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // typed by the user
    line 2: let off = 10; // 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

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