App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 193 · 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 = 45; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
2. 2.⚙️ 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);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // typed by the user
   line 2: let qty = 4; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 4 (b) line 3 (c) line 1 (d) line 2
4. 4.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) typing your age (d) a beep sound
5. 5.True or false: typing your age is an input. (a) True (b) False
6. 6.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ What number does this app show?
   let price = 55; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
8. 8.Which of these is an output? (a) adding up a bill (b) tapping a button (c) taking a photo (d) a pop-up message
9. 9.True or false: tapping a button is processing. (a) False (b) True
10. 10.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
11. 11.⚙️ 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);
12. 12.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) speaking a command (d) tapping a button
13. 13.Which of these is processing? (a) a beep sound (b) sorting the scores (c) speaking a command (d) tapping a button
14. 14.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.🔍 Which is the odd one out? (a) a pop-up message (b) checking a password (c) a buzz (vibration) (d) a beep sound
16. 16.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.Which of these is an output? (a) working out a tip (b) a beep sound (c) checking a password (d) taking a photo
19. 19.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
20. 20.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) taking a photo (d) sorting the scores
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 48; // 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 1 (b) line 4 (c) line 3 (d) line 2
22. 22.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
23. 23.⚙️ What number does this app show?
    let bill = 99; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ 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);
25. 25.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) speaking a command (d) a buzz (vibration)
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
27. 27.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
28. 28.Which of these is an output? (a) sorting the scores (b) adding up a bill (c) taking a photo (d) a buzz (vibration)
29. 29.⚙️ What number does this app show?
    let bill = 81; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.Which of these is an input? (a) a buzz (vibration) (b) speaking a command (c) working out a tip (d) sorting the scores
31. 31.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
32. 32.True or false: a buzz (vibration) is an output. (a) False (b) True
33. 33.True or false: speaking a command is an input. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) a beep sound (d) tapping a button
35. 35.Which of these is an input? (a) working out a tip (b) a pop-up message (c) typing your age (d) checking a password
36. 36.⚙️ 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);
37. 37.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
38. 38.Which of these is processing? (a) working out a tip (b) a result on screen (c) typing your age (d) speaking a command
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
40. 40.Which of these is processing? (a) a result on screen (b) adding up a bill (c) a buzz (vibration) (d) tapping a button

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