App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 606 · 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: checking a password is an output. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) typing your age (b) a buzz (vibration) (c) a result on screen (d) a beep sound
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 11; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
4. 4.⚙️ 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 1 (b) line 3 (c) line 2
5. 5.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) speaking a command (d) a pop-up message
6. 6.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
7. 7.True or false: working out a tip is processing. (a) True (b) False
8. 8.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
9. 9.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 320; // 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
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 1 (b) line 4 (c) line 2 (d) line 3
12. 12.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) a pop-up message (d) a result on screen
13. 13.Which of these is an output? (a) checking a password (b) adding up a bill (c) a beep sound (d) typing your age
14. 14.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
16. 16.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.True or false: adding up a bill is processing. (a) True (b) False
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 520; // 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 2 (b) line 1 (c) line 3 (d) line 4
19. 19.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
21. 21.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
22. 22.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
23. 23.🔍 Which is the odd one out? (a) working out a tip (b) a pop-up message (c) a result on screen (d) a buzz (vibration)
24. 24.True or false: sorting the scores is an output. (a) True (b) False
25. 25.True or false: a beep sound is an output. (a) False (b) True
26. 26.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
27. 27.True or false: checking a password is an input. (a) True (b) False
28. 28.True or false: speaking a command is an output. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) checking a password (d) a result on screen
30. 30.Which of these is an output? (a) taking a photo (b) a result on screen (c) adding up a bill (d) checking a password
31. 31.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
33. 33.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) tapping a button
34. 34.⚙️ What number does this app show?
    let price = 150; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.True or false: typing your age is an input. (a) False (b) True
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
37. 37.⚙️ 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 1 (b) line 2 (c) line 3
38. 38.True or false: adding up a bill is an input. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 2 (b) line 3 (c) line 4 (d) line 1
40. 40.Which of these is processing? (a) typing your age (b) checking a password (c) speaking a command (d) a beep sound

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