App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 600 · 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 is the odd one out? (a) taking a photo (b) typing your age (c) a result on screen (d) speaking a command
2. 2.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) speaking a command (d) working out a tip
3. 3.True or false: taking a photo is processing. (a) False (b) True
4. 4.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 4; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
6. 6.True or false: sorting the scores is processing. (a) False (b) True
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 78; // 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 4 (b) line 2 (c) line 1 (d) line 3
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 385; // 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 1 (b) line 2 (c) line 3 (d) line 4
9. 9.True or false: adding up a bill is an output. (a) True (b) False
10. 10.Which of these is an output? (a) working out a tip (b) taking a photo (c) speaking a command (d) a beep sound
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) sorting the scores (d) adding up a bill
12. 12.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
13. 13.True or false: speaking a command is an output. (a) False (b) True
14. 14.True or false: taking a photo is an input. (a) False (b) True
15. 15.⚙️ What number does this app show?
    let price = 530; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
16. 16.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) a buzz (vibration)
17. 17.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.Which of these is an output? (a) tapping a button (b) taking a photo (c) working out a tip (d) a result on screen
19. 19.Which of these is processing? (a) a pop-up message (b) speaking a command (c) adding up a bill (d) a result on screen
20. 20.Which of these is an input? (a) checking a password (b) tapping a button (c) a pop-up message (d) a result on screen
21. 21.Which of these is processing? (a) working out a tip (b) a buzz (vibration) (c) speaking a command (d) a pop-up message
22. 22.🔍 Which is the odd one out? (a) adding up a bill (b) typing your age (c) speaking a command (d) tapping a button
23. 23.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) tapping a button (d) typing your age
24. 24.True or false: typing your age is an output. (a) True (b) False
25. 25.True or false: a pop-up message is an input. (a) True (b) False
26. 26.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
28. 28.🔍 Which is the odd one out? (a) a pop-up message (b) tapping a button (c) a result on screen (d) a beep sound
29. 29.True or false: a result on screen is an output. (a) False (b) True
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 288; // 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 1 (c) line 4 (d) line 2
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // 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 4 (d) line 3
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 440; // 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 1 (b) line 2 (c) line 4 (d) line 3
33. 33.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
34. 34.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
35. 35.True or false: tapping a button is an input. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 370; // 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 2 (c) line 3 (d) line 1
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 184; // 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 4 (b) line 2 (c) line 3 (d) line 1

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