App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 816 · 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 = 260; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
3. 3.True or false: speaking a command is an input. (a) False (b) True
4. 4.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 138; // typed by the user
   line 2: let friends = 2; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 1 (b) line 2 (c) line 4 (d) line 3
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 85; // 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 3 (b) line 1 (c) line 4 (d) line 2
7. 7.True or false: a pop-up message is an input. (a) True (b) False
8. 8.Which of these is processing? (a) taking a photo (b) tapping a button (c) a result on screen (d) working out a tip
9. 9.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) tapping a button (d) typing your age
10. 10.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) working out a tip (d) sorting the scores
11. 11.True or false: a result on screen is processing. (a) False (b) True
12. 12.True or false: a buzz (vibration) is an output. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) typing your age (d) working out a tip
14. 14.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) adding up a bill
15. 15.True or false: tapping a button is an output. (a) True (b) False
16. 16.⚙️ What number does this app show?
    let bill = 220; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.⚙️ What number does this app show?
    let bill = 108; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
19. 19.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
20. 20.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
21. 21.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
22. 22.True or false: taking a photo is an input. (a) False (b) True
23. 23.⚙️ What number does this app show?
    let price = 470; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.True or false: working out a tip is an input. (a) True (b) False
25. 25.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
26. 26.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) sorting the scores (d) tapping a button
27. 27.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 1 (b) line 3 (c) line 4 (d) line 2
29. 29.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ What number does this app show?
    let bill = 72; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
32. 32.Which of these is an output? (a) a pop-up message (b) working out a tip (c) tapping a button (d) taking a photo
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 360; // 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
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
35. 35.⚙️ 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);
36. 36.True or false: tapping a button is an input. (a) False (b) True
37. 37.⚙️ 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 1 (c) line 2
38. 38.True or false: tapping a button is processing. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 136; // 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 3 (b) line 4 (c) line 1 (d) line 2
40. 40.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) checking a password (d) a result on screen

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