App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 240 · 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 km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.⚙️ What number does this app show?
   let bill = 98; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
4. 4.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 48; // 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 3 (b) line 1 (c) line 4 (d) line 2
6. 6.True or false: taking a photo is an input. (a) False (b) True
7. 7.Which of these is an input? (a) a beep sound (b) adding up a bill (c) sorting the scores (d) speaking a command
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 90; // 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 3 (b) line 4 (c) line 1 (d) line 2
9. 9.True or false: adding up a bill is an output. (a) True (b) False
10. 10.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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
12. 12.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
13. 13.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
15. 15.True or false: sorting the scores is an input. (a) False (b) True
16. 16.Which of these is an input? (a) adding up a bill (b) taking a photo (c) a beep sound (d) a pop-up message
17. 17.Which of these is an input? (a) a result on screen (b) tapping a button (c) checking a password (d) adding up a bill
18. 18.⚙️ 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
19. 19.🔍 Which is the odd one out? (a) typing your age (b) adding up a bill (c) taking a photo (d) tapping a button
20. 20.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) typing your age (d) working out a tip
21. 21.True or false: typing your age is an input. (a) True (b) False
22. 22.Which of these is processing? (a) taking a photo (b) typing your age (c) working out a tip (d) tapping a button
23. 23.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) speaking a command (d) adding up a bill
24. 24.True or false: a result on screen is an output. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) tapping a button (d) speaking a command
26. 26.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) taking a photo
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 4 (b) line 3 (c) line 1 (d) line 2
28. 28.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
29. 29.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) adding up a bill (d) tapping a button
30. 30.True or false: working out a tip is processing. (a) True (b) False
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 345; // 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 4 (b) line 2 (c) line 3 (d) line 1
32. 32.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
33. 33.True or false: typing your age is processing. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) a result on screen
35. 35.Which of these is processing? (a) tapping a button (b) sorting the scores (c) a result on screen (d) a buzz (vibration)
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 3 (c) line 2 (d) line 4
37. 37.🔍 Which is the odd one out? (a) a pop-up message (b) typing your age (c) a beep sound (d) a result on screen
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 174; // 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 3 (c) line 2 (d) line 1
39. 39.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 520; // 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 4 (d) line 3

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