App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 870 · 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 bill = 92; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.True or false: speaking a command is an input. (a) True (b) False
3. 3.⚙️ 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 1 (c) line 2 (d) line 3
4. 4.True or false: a beep sound is processing. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) speaking a command (b) sorting the scores (c) working out a tip (d) checking a password
6. 6.⚙️ What number does this app show?
   let price = 460; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.Which of these is an input? (a) working out a tip (b) sorting the scores (c) checking a password (d) taking a photo
8. 8.⚙️ What number does this app show?
   let bill = 230; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ What number does this app show?
   let bill = 100; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // 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 1 (d) line 3
11. 11.True or false: working out a tip is processing. (a) True (b) False
12. 12.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 450; // 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 4 (b) line 3 (c) line 1 (d) line 2
14. 14.Which of these is processing? (a) typing your age (b) a result on screen (c) sorting the scores (d) tapping a button
15. 15.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
16. 16.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
18. 18.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
19. 19.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
20. 20.True or false: a buzz (vibration) is an output. (a) True (b) False
21. 21.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
22. 22.⚙️ What number does this app show?
    let bill = 240; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
23. 23.Which of these is an input? (a) sorting the scores (b) tapping a button (c) adding up a bill (d) working out a tip
24. 24.⚙️ What number does this app show?
    let price = 380; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ What number does this app show?
    let price = 120; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
27. 27.🔍 Which is the odd one out? (a) sorting the scores (b) a buzz (vibration) (c) a beep sound (d) a result on screen
28. 28.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
29. 29.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.Which of these is an output? (a) adding up a bill (b) a beep sound (c) tapping a button (d) sorting the scores
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 1 (b) line 4 (c) line 3 (d) line 2
32. 32.⚙️ What number does this app show?
    let bill = 72; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.⚙️ 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);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // 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 2 (b) line 3 (c) line 4 (d) line 1
35. 35.True or false: checking a password is processing. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) adding up a bill (d) speaking a command
37. 37.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) a beep sound (d) working out a tip
38. 38.⚙️ What number does this app show?
    let price = 480; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
40. 40.True or false: tapping a button is an input. (a) False (b) True

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