App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 996 · 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 is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) tapping a button (d) a result on screen
2. 2.🔍 Which is the odd one out? (a) sorting the scores (b) a pop-up message (c) working out a tip (d) checking a password
3. 3.⚙️ What number does this app show?
   let price = 410; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
5. 5.⚙️ What number does this app show?
   let price = 55; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 50; // 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 4 (c) line 2 (d) line 1
7. 7.True or false: tapping a button is an input. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) a result on screen (d) taking a photo
9. 9.True or false: a pop-up message is processing. (a) False (b) True
10. 10.True or false: adding up a bill is an output. (a) True (b) False
11. 11.⚙️ 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);
12. 12.True or false: typing your age is an input. (a) True (b) False
13. 13.True or false: a beep sound is an output. (a) False (b) True
14. 14.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
15. 15.True or false: working out a tip is processing. (a) False (b) True
16. 16.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
19. 19.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
20. 20.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) working out a tip (d) adding up a bill
21. 21.⚙️ What number does this app show?
    let bill = 54; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
23. 23.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
24. 24.True or false: a result on screen is an output. (a) False (b) True
25. 25.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ 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);
27. 27.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.⚙️ What number does this app show?
    let bill = 256; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.⚙️ What number does this app show?
    let bill = 159; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 155; // 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 3 (b) line 2 (c) line 4 (d) line 1
31. 31.⚙️ What number does this app show?
    let bill = 201; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // typed by the user
    line 2: let qty = 5; // 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
33. 33.True or false: checking a password is an output. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) taking a photo
35. 35.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.⚙️ What number does this app show?
    let bill = 126; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 46; // 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 3 (d) line 4
38. 38.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
39. 39.⚙️ What number does this app show?
    let bill = 350; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 2 (b) line 1 (c) line 3 (d) line 4

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