App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 169 · 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 price = 100; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
2. 2.Which of these is an output? (a) a result on screen (b) taking a photo (c) sorting the scores (d) checking a password
3. 3.⚙️ What number does this app show?
   let price = 540; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ What number does this app show?
   let bill = 204; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
6. 6.⚙️ What number does this app show?
   let km = 14; // typed by the user
   let metres = km * 1000;
   show(metres);
7. 7.True or false: a pop-up message is an output. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) a pop-up message (b) adding up a bill (c) a result on screen (d) a beep sound
9. 9.⚙️ What number does this app show?
   let price = 330; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 320; // 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
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 1 (b) line 3 (c) line 4 (d) line 2
13. 13.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a beep sound
14. 14.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 5; // 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 = 3; // typed by the user
    let total = price * qty;
    show(total);
16. 16.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
17. 17.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.True or false: sorting the scores is an output. (a) True (b) False
19. 19.⚙️ What number does this app show?
    let bill = 84; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
21. 21.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 136; // 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 2 (c) line 3 (d) line 1
23. 23.True or false: tapping a button is an output. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) tapping a button (b) working out a tip (c) typing your age (d) speaking a command
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 1 (b) line 2 (c) line 3 (d) line 4
26. 26.True or false: checking a password is an input. (a) False (b) True
27. 27.Which of these is processing? (a) sorting the scores (b) a pop-up message (c) a buzz (vibration) (d) a result on screen
28. 28.Which of these is an input? (a) a result on screen (b) typing your age (c) working out a tip (d) adding up a bill
29. 29.🔍 Which is the odd one out? (a) sorting the scores (b) typing your age (c) adding up a bill (d) checking a password
30. 30.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
32. 32.Which of these is an input? (a) a result on screen (b) checking a password (c) a buzz (vibration) (d) tapping a button
33. 33.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
34. 34.🔍 Which is the odd one out? (a) typing your age (b) checking a password (c) tapping a button (d) speaking a command
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // typed by the user
    line 2: let qty = 3; // 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
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 164; // 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
37. 37.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.Which of these is an output? (a) typing your age (b) a pop-up message (c) taking a photo (d) adding up a bill
39. 39.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
40. 40.⚙️ 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 1 (b) line 3 (c) line 2

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