App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 744 · 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.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
2. 2.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a beep sound (d) speaking a command
3. 3.True or false: working out a tip is an output. (a) True (b) False
4. 4.Which of these is an input? (a) speaking a command (b) working out a tip (c) a result on screen (d) sorting the scores
5. 5.⚙️ What number does this app show?
   let price = 260; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 3 (c) line 4 (d) line 2
8. 8.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) working out a tip (d) speaking a command
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 128; // 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
10. 10.Which of these is processing? (a) working out a tip (b) typing your age (c) tapping a button (d) speaking a command
11. 11.⚙️ What number does this app show?
    let bill = 192; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) working out a tip (d) sorting the scores
13. 13.True or false: typing your age is an output. (a) False (b) True
14. 14.True or false: sorting the scores is processing. (a) False (b) True
15. 15.⚙️ 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);
16. 16.True or false: adding up a bill is processing. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) sorting the scores (b) a pop-up message (c) adding up a bill (d) working out a tip
18. 18.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
19. 19.Which of these is an output? (a) typing your age (b) a result on screen (c) tapping a button (d) sorting the scores
20. 20.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
21. 21.True or false: taking a photo is an input. (a) False (b) True
22. 22.⚙️ What number does this app show?
    let price = 410; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.⚙️ What number does this app show?
    let bill = 108; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ What number does this app show?
    let bill = 51; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.Which of these is an input? (a) tapping a button (b) adding up a bill (c) working out a tip (d) a beep sound
26. 26.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ What number does this app show?
    let bill = 33; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.True or false: taking a photo is processing. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) typing your age (d) tapping a button
30. 30.True or false: tapping a button is an output. (a) False (b) True
31. 31.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.Which of these is processing? (a) typing your age (b) tapping a button (c) taking a photo (d) adding up a bill
33. 33.🔍 Which is the odd one out? (a) typing your age (b) adding up a bill (c) tapping a button (d) taking a photo
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // 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 4 (b) line 2 (c) line 3 (d) line 1
35. 35.Which of these is processing? (a) a beep sound (b) a buzz (vibration) (c) checking a password (d) tapping a button
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 2 (b) line 3 (c) line 4 (d) line 1
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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 3 (c) line 2 (d) line 1
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
39. 39.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) a result on screen (d) sorting the scores
40. 40.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output

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