App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 351 · 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 = 25; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
2. 2.True or false: a buzz (vibration) is an output. (a) False (b) True
3. 3.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
4. 4.True or false: taking a photo is an input. (a) True (b) False
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
6. 6.Which of these is an input? (a) a buzz (vibration) (b) a result on screen (c) typing your age (d) working out a tip
7. 7.⚙️ What number does this app show?
   let bill = 310; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 250; // 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 4 (d) line 2
9. 9.⚙️ 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 2 (b) line 1 (c) line 3 (d) line 4
10. 10.True or false: adding up a bill is an input. (a) True (b) False
11. 11.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
12. 12.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) typing your age (d) working out a tip
13. 13.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
14. 14.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // 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 3 (c) line 1 (d) line 4
16. 16.True or false: speaking a command is an input. (a) False (b) True
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 1 (b) line 4 (c) line 3 (d) line 2
18. 18.🔍 Which is the odd one out? (a) checking a password (b) a beep sound (c) a buzz (vibration) (d) a pop-up message
19. 19.Which of these is an output? (a) tapping a button (b) a result on screen (c) typing your age (d) adding up a bill
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
21. 21.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
22. 22.True or false: adding up a bill is processing. (a) False (b) True
23. 23.True or false: typing your age is an input. (a) True (b) False
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
25. 25.⚙️ What number does this app show?
    let bill = 60; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) working out a tip (d) typing your age
27. 27.True or false: a result on screen is an output. (a) True (b) False
28. 28.True or false: working out a tip is processing. (a) False (b) True
29. 29.Which of these is an input? (a) a buzz (vibration) (b) sorting the scores (c) speaking a command (d) checking a password
30. 30.⚙️ 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);
31. 31.True or false: a buzz (vibration) is processing. (a) True (b) False
32. 32.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
33. 33.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
34. 34.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) a buzz (vibration) (d) adding up a bill
35. 35.True or false: typing your age is an output. (a) False (b) True
36. 36.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
37. 37.Which of these is processing? (a) a buzz (vibration) (b) a result on screen (c) working out a tip (d) taking a photo
38. 38.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 2 (c) line 4 (d) line 3
40. 40.Which of these is an input? (a) taking a photo (b) a beep sound (c) checking a password (d) a result on screen

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