App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 368 · 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 km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) a beep sound
3. 3.True or false: adding up a bill is an input. (a) True (b) False
4. 4.True or false: checking a password is an output. (a) False (b) True
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 580; // 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
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 440; // 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 4 (b) line 3 (c) line 1 (d) line 2
7. 7.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) output (c) processing
8. 8.⚙️ What number does this app show?
   let bill = 219; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
10. 10.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
11. 11.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 2 (b) line 1 (c) line 4 (d) line 3
13. 13.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
14. 14.True or false: a buzz (vibration) is an input. (a) True (b) False
15. 15.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
16. 16.True or false: working out a tip is processing. (a) True (b) False
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // 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 3 (b) line 4 (c) line 1 (d) line 2
18. 18.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) taking a photo (d) a beep sound
19. 19.Which of these is processing? (a) taking a photo (b) checking a password (c) tapping a button (d) speaking a command
20. 20.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
21. 21.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 174; // 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 4 (c) line 1 (d) line 3
23. 23.⚙️ What number does this app show?
    let bill = 395; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 66; // 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 4 (b) line 2 (c) line 1 (d) line 3
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 150; // 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 2 (b) line 4 (c) line 3 (d) line 1
26. 26.Which of these is an input? (a) a result on screen (b) adding up a bill (c) taking a photo (d) sorting the scores
27. 27.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) checking a password (d) a buzz (vibration)
28. 28.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
29. 29.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 550; // 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 2 (b) line 4 (c) line 3 (d) line 1
31. 31.True or false: sorting the scores is processing. (a) False (b) True
32. 32.True or false: a pop-up message is an output. (a) True (b) False
33. 33.True or false: speaking a command is an output. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) a buzz (vibration) (d) speaking a command
35. 35.⚙️ 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);
36. 36.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
37. 37.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
38. 38.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a result on screen
40. 40.Which of these is an output? (a) taking a photo (b) checking a password (c) a result on screen (d) tapping a button

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