App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 966 · 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 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 2 (b) line 4 (c) line 1 (d) line 3
2. 2.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) tapping a button (d) typing your age
3. 3.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
4. 4.⚙️ What number does this app show?
   let price = 160; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
6. 6.🔍 Which is the odd one out? (a) tapping a button (b) a result on screen (c) a pop-up message (d) a buzz (vibration)
7. 7.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
8. 8.True or false: typing your age is an input. (a) True (b) False
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 12; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // 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
11. 11.Which of these is an output? (a) sorting the scores (b) taking a photo (c) adding up a bill (d) a pop-up message
12. 12.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
13. 13.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
16. 16.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) sorting the scores
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 188; // 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 1 (d) line 3
18. 18.Which of these is an input? (a) checking a password (b) speaking a command (c) working out a tip (d) adding up a bill
19. 19.True or false: a pop-up message is an output. (a) False (b) True
20. 20.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
21. 21.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) a buzz (vibration) (d) a beep sound
23. 23.Which of these is an input? (a) a buzz (vibration) (b) taking a photo (c) checking a password (d) a beep sound
24. 24.True or false: checking a password is an input. (a) False (b) True
25. 25.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
27. 27.Which of these is processing? (a) taking a photo (b) typing your age (c) sorting the scores (d) a pop-up message
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 110; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 3 (c) line 1 (d) line 2
29. 29.True or false: taking a photo is an output. (a) False (b) True
30. 30.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ 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);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 580; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 2 (c) line 3 (d) line 4
33. 33.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.⚙️ What number does this app show?
    let bill = 114; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 4 (b) line 2 (c) line 3 (d) line 1
36. 36.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) working out a tip (d) speaking a command
37. 37.True or false: working out a tip is processing. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) a buzz (vibration) (b) working out a tip (c) a result on screen (d) a beep sound
39. 39.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) adding up a bill (d) typing your age
40. 40.🔍 Which is the odd one out? (a) speaking a command (b) a result on screen (c) taking a photo (d) typing your age

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