App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 178 · 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 = 100; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
3. 3.Which of these is processing? (a) speaking a command (b) typing your age (c) adding up a bill (d) a beep sound
4. 4.Which of these is an output? (a) working out a tip (b) checking a password (c) a result on screen (d) sorting the scores
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // 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 3 (b) line 1 (c) line 4 (d) line 2
6. 6.True or false: typing your age is an output. (a) False (b) True
7. 7.Which of these is an output? (a) sorting the scores (b) speaking a command (c) a pop-up message (d) typing your age
8. 8.⚙️ 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);
9. 9.True or false: checking a password is an input. (a) False (b) True
10. 10.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 85; // 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 2 (b) line 1 (c) line 4 (d) line 3
12. 12.🔍 Which is the odd one out? (a) a pop-up message (b) speaking a command (c) taking a photo (d) typing your age
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 240; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 2 (b) line 1 (c) line 3 (d) line 4
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 140; // 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 1 (b) line 4 (c) line 2 (d) line 3
15. 15.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) a pop-up message (d) tapping a button
16. 16.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
17. 17.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) checking a password (d) sorting the scores
18. 18.⚙️ What number does this app show?
    let bill = 231; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.Which of these is processing? (a) a beep sound (b) checking a password (c) tapping a button (d) taking a photo
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 95; // 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 2 (b) line 4 (c) line 1 (d) line 3
21. 21.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a result on screen (d) speaking a command
22. 22.True or false: sorting the scores is an output. (a) True (b) False
23. 23.⚙️ 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);
24. 24.Which of these is an output? (a) checking a password (b) working out a tip (c) sorting the scores (d) a beep sound
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 75; // 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 4 (b) line 2 (c) line 3 (d) line 1
26. 26.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) speaking a command
27. 27.🔍 Which is the odd one out? (a) tapping a button (b) a buzz (vibration) (c) speaking a command (d) taking a photo
28. 28.Which of these is an input? (a) typing your age (b) working out a tip (c) a result on screen (d) adding up a bill
29. 29.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) adding up a bill
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 80; // 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 4 (c) line 3 (d) line 2
31. 31.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 42; // 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 4 (c) line 3 (d) line 2
33. 33.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
35. 35.Which of these is an input? (a) speaking a command (b) a pop-up message (c) a result on screen (d) a beep sound
36. 36.True or false: checking a password is processing. (a) True (b) False
37. 37.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
38. 38.🔍 Which is the odd one out? (a) a beep sound (b) sorting the scores (c) adding up a bill (d) working out a tip
39. 39.True or false: a pop-up message is an output. (a) False (b) True
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 4 (b) line 1 (c) line 3 (d) line 2

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