App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 75 · 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 of these is an output? (a) working out a tip (b) checking a password (c) tapping a button (d) a result on screen
2. 2.⚙️ What number does this app show?
   let bill = 208; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ What number does this app show?
   let price = 150; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.Which of these is processing? (a) checking a password (b) tapping a button (c) a pop-up message (d) taking a photo
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 570; // 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 4 (c) line 3 (d) line 1
6. 6.True or false: working out a tip is processing. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) sorting the scores (b) a buzz (vibration) (c) adding up a bill (d) working out a tip
8. 8.Which of these is an input? (a) sorting the scores (b) tapping a button (c) a result on screen (d) a pop-up message
9. 9.⚙️ What number does this app show?
   let km = 6; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.Which of these is an input? (a) sorting the scores (b) a beep sound (c) taking a photo (d) a pop-up message
11. 11.True or false: a beep sound is an output. (a) False (b) True
12. 12.Which of these is an output? (a) sorting the scores (b) working out a tip (c) adding up a bill (d) a buzz (vibration)
13. 13.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) working out a tip (d) adding up a bill
14. 14.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) a beep sound
15. 15.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) working out a tip (d) sorting the scores
16. 16.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
17. 17.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
19. 19.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) a pop-up message
20. 20.True or false: tapping a button is an input. (a) False (b) True
21. 21.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
22. 22.⚙️ What number does this app show?
    let price = 490; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
24. 24.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) a beep sound
25. 25.True or false: a result on screen is processing. (a) True (b) False
26. 26.⚙️ 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);
27. 27.⚙️ What number does this app show?
    let bill = 320; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 196; // 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.Which of these is an input? (a) working out a tip (b) a buzz (vibration) (c) speaking a command (d) a pop-up message
30. 30.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.True or false: a buzz (vibration) is an output. (a) True (b) False
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 90; // 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 3 (c) line 4 (d) line 1
34. 34.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 50; // 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 3 (c) line 4 (d) line 2
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.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 450; // 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 3 (b) line 2 (c) line 4 (d) line 1
40. 40.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input

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