App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 309 · 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) speaking a command (b) typing your age (c) tapping a button (d) working out a tip
2. 2.True or false: typing your age is an output. (a) True (b) False
3. 3.True or false: taking a photo is an output. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) a result on screen
5. 5.Which of these is processing? (a) checking a password (b) a pop-up message (c) taking a photo (d) a beep sound
6. 6.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.Which of these is an input? (a) typing your age (b) adding up a bill (c) sorting the scores (d) a pop-up message
8. 8.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
9. 9.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
10. 10.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
11. 11.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: taking a photo is an input. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) tapping a button (d) sorting the scores
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
15. 15.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 1 (c) line 2 (d) line 4
17. 17.⚙️ What number does this app show?
    let price = 320; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.True or false: tapping a button is an input. (a) False (b) True
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 2 (b) line 1 (c) line 3 (d) line 4
20. 20.Which of these is an input? (a) a buzz (vibration) (b) speaking a command (c) working out a tip (d) a result on screen
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 260; // 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 2 (c) line 4 (d) line 3
22. 22.Which of these is processing? (a) working out a tip (b) a beep sound (c) speaking a command (d) a pop-up message
23. 23.True or false: tapping a button is an output. (a) False (b) True
24. 24.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 114; // 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 1 (b) line 4 (c) line 2 (d) line 3
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 110; // 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 3 (c) line 1 (d) line 4
27. 27.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) a pop-up message
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 204; // 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 4 (b) line 3 (c) line 2 (d) line 1
29. 29.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
31. 31.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
32. 32.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) sorting the scores (d) tapping a button
33. 33.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
34. 34.⚙️ What number does this app show?
    let price = 240; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ 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);
36. 36.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
37. 37.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.Which of these is an output? (a) typing your age (b) adding up a bill (c) checking a password (d) a buzz (vibration)
39. 39.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
40. 40.Which of these is processing? (a) adding up a bill (b) a beep sound (c) taking a photo (d) a result on screen

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