App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 143 · 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 = 126; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.Which of these is processing? (a) a result on screen (b) working out a tip (c) a pop-up message (d) a beep sound
3. 3.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
4. 4.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ 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);
6. 6.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) a pop-up message (d) speaking a command
7. 7.True or false: checking a password is processing. (a) True (b) False
8. 8.⚙️ What number does this app show?
   let bill = 138; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ What number does this app show?
   let price = 70; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 64; // 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 3 (c) line 2 (d) line 4
11. 11.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.Which of these is an output? (a) checking a password (b) adding up a bill (c) working out a tip (d) a buzz (vibration)
13. 13.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
14. 14.Which of these is processing? (a) speaking a command (b) sorting the scores (c) a pop-up message (d) a beep sound
15. 15.🔍 Which is the odd one out? (a) sorting the scores (b) speaking a command (c) checking a password (d) adding up a bill
16. 16.⚙️ What number does this app show?
    let price = 410; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
18. 18.⚙️ 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 4 (b) line 2 (c) line 1 (d) line 3
19. 19.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
20. 20.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) adding up a bill (d) tapping a button
21. 21.Which of these is an input? (a) tapping a button (b) adding up a bill (c) checking a password (d) a beep sound
22. 22.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) typing your age (d) a buzz (vibration)
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (b) line 1 (c) line 3 (d) line 2
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 304; // 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 4 (c) line 1 (d) line 2
25. 25.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
26. 26.True or false: typing your age is an input. (a) True (b) False
27. 27.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 2 (b) line 1 (c) line 4 (d) line 3
29. 29.Which of these is an output? (a) adding up a bill (b) working out a tip (c) typing your age (d) a result on screen
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 70; // 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 4 (c) line 1 (d) line 3
31. 31.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
32. 32.True or false: working out a tip is an input. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) a beep sound
34. 34.⚙️ What number does this app show?
    let bill = 235; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.True or false: sorting the scores is processing. (a) True (b) False
36. 36.Which of these is an output? (a) working out a tip (b) speaking a command (c) a beep sound (d) sorting the scores
37. 37.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) a result on screen
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 62; // 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 3 (c) line 4 (d) line 2
39. 39.Which of these is an input? (a) adding up a bill (b) a beep sound (c) sorting the scores (d) taking a photo
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 1 (b) line 2 (c) line 3 (d) line 4

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