App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 153 · 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 = 220; // 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 4 (c) line 3 (d) line 1
2. 2.⚙️ What number does this app show?
   let km = 2; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.⚙️ What number does this app show?
   let bill = 76; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.Which of these is an input? (a) tapping a button (b) a result on screen (c) sorting the scores (d) adding up a bill
5. 5.True or false: speaking a command is an output. (a) True (b) False
6. 6.⚙️ What number does this app show?
   let price = 15; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
7. 7.True or false: working out a tip is processing. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) adding up a bill (d) a pop-up message
9. 9.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
10. 10.Which of these is an input? (a) checking a password (b) working out a tip (c) typing your age (d) a buzz (vibration)
11. 11.⚙️ 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 2 (b) line 3 (c) line 1
12. 12.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
13. 13.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
14. 14.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 2 (b) line 4 (c) line 1 (d) line 3
16. 16.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) typing your age (d) speaking a command
17. 17.True or false: tapping a button is an output. (a) False (b) True
18. 18.Which of these is processing? (a) taking a photo (b) adding up a bill (c) typing your age (d) speaking a command
19. 19.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
20. 20.True or false: a beep sound is an output. (a) True (b) False
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 148; // 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 2 (c) line 4 (d) line 1
22. 22.⚙️ 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);
23. 23.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
24. 24.True or false: a result on screen is processing. (a) True (b) False
25. 25.Which of these is processing? (a) tapping a button (b) a beep sound (c) a result on screen (d) working out a tip
26. 26.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
27. 27.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a result on screen (d) sorting the scores
28. 28.🔍 Which is the odd one out? (a) taking a photo (b) a pop-up message (c) tapping a button (d) speaking a command
29. 29.Which of these is an input? (a) a result on screen (b) checking a password (c) a pop-up message (d) speaking a command
30. 30.True or false: sorting the scores is an output. (a) True (b) False
31. 31.True or false: a result on screen is an input. (a) True (b) False
32. 32.⚙️ What number does this app show?
    let price = 400; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.Which of these is processing? (a) a beep sound (b) sorting the scores (c) a buzz (vibration) (d) tapping a button
34. 34.🔍 Which is the odd one out? (a) typing your age (b) a result on screen (c) a beep sound (d) a buzz (vibration)
35. 35.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) tapping a button
36. 36.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 156; // 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 1 (c) line 3 (d) line 4
38. 38.⚙️ 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 3 (b) line 4 (c) line 2 (d) line 1
39. 39.⚙️ What number does this app show?
    let bill = 256; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);

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