App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 794 · 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 = 580; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.🔍 Which is the odd one out? (a) working out a tip (b) adding up a bill (c) checking a password (d) typing your age
3. 3.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) sorting the scores (d) a buzz (vibration)
4. 4.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
5. 5.⚙️ 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);
6. 6.True or false: working out a tip is an input. (a) True (b) False
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 560; // 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 3 (c) line 2 (d) line 4
8. 8.True or false: taking a photo is an input. (a) False (b) True
9. 9.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
10. 10.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
11. 11.⚙️ What number does this app show?
    let bill = 156; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
12. 12.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) a result on screen (d) checking a password
13. 13.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
14. 14.⚙️ What number does this app show?
    let price = 120; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.Which of these is an input? (a) speaking a command (b) adding up a bill (c) a pop-up message (d) working out a tip
16. 16.🔍 Which is the odd one out? (a) checking a password (b) taking a photo (c) working out a tip (d) adding up a bill
17. 17.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) a buzz (vibration)
18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
19. 19.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
20. 20.Which of these is an output? (a) typing your age (b) speaking a command (c) adding up a bill (d) a buzz (vibration)
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 1 (b) line 3 (c) line 4 (d) line 2
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 1 (c) line 2
23. 23.🔍 Which is the odd one out? (a) adding up a bill (b) tapping a button (c) typing your age (d) speaking a command
24. 24.⚙️ 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 2 (b) line 1 (c) line 3
25. 25.Which of these is an output? (a) a result on screen (b) speaking a command (c) checking a password (d) adding up a bill
26. 26.True or false: tapping a button is an input. (a) False (b) True
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 177; // typed by the user
    line 2: let friends = 3; // 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
28. 28.True or false: sorting the scores is processing. (a) True (b) False
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 1 (d) line 2
30. 30.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
31. 31.Which of these is an output? (a) working out a tip (b) a pop-up message (c) typing your age (d) sorting the scores
32. 32.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
33. 33.Which of these is processing? (a) a buzz (vibration) (b) taking a photo (c) checking a password (d) tapping a button
34. 34.⚙️ What number does this app show?
    let bill = 75; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.True or false: a buzz (vibration) is processing. (a) False (b) True
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 1 (b) line 4 (c) line 2 (d) line 3
37. 37.🔍 Which is the odd one out? (a) typing your age (b) checking a password (c) taking a photo (d) tapping a button
38. 38.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) a pop-up message (d) taking a photo
39. 39.Which of these is an input? (a) working out a tip (b) a result on screen (c) checking a password (d) taking a photo
40. 40.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output

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