App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 537 · 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.True or false: a pop-up message is an output. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let bill = 207; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 210; // 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 1 (c) line 4 (d) line 3
4. 4.True or false: adding up a bill is processing. (a) True (b) False
5. 5.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
7. 7.Which of these is an input? (a) working out a tip (b) taking a photo (c) a pop-up message (d) adding up a bill
8. 8.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
9. 9.⚙️ What number does this app show?
   let price = 230; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.True or false: tapping a button is processing. (a) True (b) False
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 210; // 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 2 (c) line 1 (d) line 4
12. 12.Which of these is an output? (a) adding up a bill (b) a result on screen (c) working out a tip (d) taking a photo
13. 13.Which of these is processing? (a) a pop-up message (b) a result on screen (c) working out a tip (d) a beep sound
14. 14.True or false: typing your age is an input. (a) True (b) False
15. 15.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 95; // 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 2 (b) line 4 (c) line 3 (d) line 1
17. 17.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) checking a password (d) speaking a command
18. 18.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.Which of these is an input? (a) checking a password (b) adding up a bill (c) a pop-up message (d) typing your age
20. 20.⚙️ What number does this app show?
    let price = 150; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 330; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 1 (c) line 4 (d) line 2
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 48; // 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
23. 23.🔍 Which is the odd one out? (a) a beep sound (b) sorting the scores (c) a buzz (vibration) (d) a result on screen
24. 24.🔍 Which is the odd one out? (a) speaking a command (b) adding up a bill (c) tapping a button (d) typing your age
25. 25.⚙️ 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);
26. 26.Which of these is processing? (a) typing your age (b) a pop-up message (c) adding up a bill (d) tapping a button
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 450; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 1 (c) line 2 (d) line 3
28. 28.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a beep sound
29. 29.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) working out a tip (d) adding up a bill
30. 30.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
32. 32.⚙️ What number does this app show?
    let bill = 76; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.True or false: tapping a button is an input. (a) False (b) True
34. 34.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 72; // 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 2 (b) line 3 (c) line 1 (d) line 4
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 72; // 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 4 (d) line 3
37. 37.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) a result on screen (d) a beep sound
38. 38.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.True or false: speaking a command is an input. (a) True (b) False
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 160; // 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

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