App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 186 · 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.⚙️ 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 4 (b) line 2 (c) line 1 (d) line 3
2. 2.True or false: taking a photo is an input. (a) True (b) False
3. 3.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
4. 4.⚙️ What number does this app show?
   let bill = 74; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.True or false: a result on screen is an output. (a) False (b) True
6. 6.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
7. 7.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) sorting the scores (d) working out a tip
8. 8.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
9. 9.⚙️ What number does this app show?
   let km = 8; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
11. 11.True or false: checking a password is processing. (a) False (b) True
12. 12.True or false: a result on screen is an input. (a) True (b) False
13. 13.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 2 (c) line 1 (d) line 3
15. 15.Which of these is an input? (a) adding up a bill (b) working out a tip (c) speaking a command (d) a beep sound
16. 16.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
17. 17.True or false: adding up a bill is an input. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) working out a tip (d) adding up a bill
19. 19.⚙️ What number does this app show?
    let bill = 78; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
20. 20.🔍 Which is the odd one out? (a) taking a photo (b) a pop-up message (c) a result on screen (d) a buzz (vibration)
21. 21.Which of these is an input? (a) working out a tip (b) adding up a bill (c) a result on screen (d) taking a photo
22. 22.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
23. 23.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
24. 24.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
25. 25.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) a result on screen
26. 26.Which of these is processing? (a) a result on screen (b) typing your age (c) speaking a command (d) working out a tip
27. 27.⚙️ What number does this app show?
    let bill = 88; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
28. 28.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
29. 29.🔍 Which is the odd one out? (a) a pop-up message (b) sorting the scores (c) adding up a bill (d) working out a tip
30. 30.True or false: tapping a button is an output. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) sorting the scores (b) speaking a command (c) typing your age (d) taking a photo
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 2 (c) line 1 (d) line 3
33. 33.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 160; // 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 4 (b) line 3 (c) line 2 (d) line 1
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 2 (b) line 3 (c) line 4 (d) line 1
36. 36.True or false: sorting the scores is an output. (a) False (b) True
37. 37.Which of these is an output? (a) speaking a command (b) a pop-up message (c) working out a tip (d) sorting the scores
38. 38.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 230; // typed by the user
    line 2: let off = 10; // 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

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