App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 176 · 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 = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) checking a password (d) a pop-up message
3. 3.True or false: checking a password is an output. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a beep sound (b) tapping a button (c) typing your age (d) speaking a command
5. 5.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) a pop-up message (d) typing your age
6. 6.⚙️ What number does this app show?
   let price = 50; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 75; // 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 1 (c) line 3 (d) line 2
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 70; // 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 3 (b) line 1 (c) line 2 (d) line 4
9. 9.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
10. 10.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
11. 11.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.True or false: typing your age is processing. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a pop-up message (b) adding up a bill (c) a beep sound (d) a buzz (vibration)
14. 14.True or false: working out a tip is an output. (a) False (b) True
15. 15.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.True or false: a beep sound is an output. (a) True (b) False
17. 17.Which of these is an input? (a) speaking a command (b) adding up a bill (c) a beep sound (d) a result on screen
18. 18.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) checking a password (d) a result on screen
19. 19.⚙️ What number does this app show?
    let price = 320; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 57; // 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 3 (c) line 4 (d) line 1
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 4 (d) line 1
22. 22.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.Which of these is processing? (a) a buzz (vibration) (b) a pop-up message (c) tapping a button (d) checking a password
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // 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 1 (b) line 4 (c) line 2 (d) line 3
25. 25.⚙️ What number does this app show?
    let bill = 285; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ 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);
27. 27.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
28. 28.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
29. 29.True or false: a pop-up message is processing. (a) False (b) True
30. 30.True or false: working out a tip is an input. (a) False (b) True
31. 31.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
33. 33.True or false: a pop-up message is an output. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) speaking a command (d) tapping a button
35. 35.⚙️ What number does this app show?
    let bill = 94; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 2 (b) line 4 (c) line 1 (d) line 3
37. 37.⚙️ 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 3 (b) line 1 (c) line 2
38. 38.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
39. 39.True or false: speaking a command is an output. (a) False (b) True
40. 40.True or false: typing your age is an output. (a) True (b) False

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