App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 97 · 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.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
2. 2.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) speaking a command (d) checking a password
3. 3.⚙️ 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);
4. 4.True or false: speaking a command is processing. (a) True (b) False
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 45; // 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
6. 6.Which of these is an input? (a) typing your age (b) a beep sound (c) adding up a bill (d) sorting the scores
7. 7.True or false: tapping a button is an input. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) typing your age (d) working out a tip
9. 9.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
10. 10.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
11. 11.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) working out a tip
12. 12.Which of these is processing? (a) checking a password (b) typing your age (c) a result on screen (d) tapping a button
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 4 (c) line 3 (d) line 2
14. 14.Which of these is processing? (a) working out a tip (b) a buzz (vibration) (c) a beep sound (d) a result on screen
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 2 (c) line 3 (d) line 1
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 164; // 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 3 (c) line 1 (d) line 2
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 2 (c) line 3 (d) line 1
18. 18.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
19. 19.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // 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 4 (c) line 1 (d) line 2
21. 21.True or false: taking a photo is an output. (a) True (b) False
22. 22.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.🔍 Which is the odd one out? (a) a buzz (vibration) (b) checking a password (c) sorting the scores (d) adding up a bill
24. 24.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) typing your age (d) a pop-up message
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 3 (c) line 1 (d) line 2
26. 26.Which of these is an output? (a) sorting the scores (b) speaking a command (c) typing your age (d) a result on screen
27. 27.True or false: speaking a command is an output. (a) True (b) False
28. 28.True or false: a beep sound is an output. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) tapping a button (b) working out a tip (c) adding up a bill (d) sorting the scores
30. 30.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) a result on screen (d) working out a tip
31. 31.⚙️ What number does this app show?
    let bill = 340; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
34. 34.True or false: speaking a command is an input. (a) False (b) True
35. 35.True or false: a buzz (vibration) is processing. (a) True (b) False
36. 36.⚙️ What number does this app show?
    let bill = 95; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
38. 38.⚙️ What number does this app show?
    let bill = 150; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 128; // 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 1 (b) line 3 (c) line 4 (d) line 2
40. 40.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);

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