App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 188 · 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 bill = 44; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.Which of these is an output? (a) working out a tip (b) adding up a bill (c) a buzz (vibration) (d) taking a photo
3. 3.⚙️ What number does this app show?
   let price = 100; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) adding up a bill (d) a beep sound
5. 5.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 3 (b) line 2 (c) line 4 (d) line 1
7. 7.Which of these is an input? (a) sorting the scores (b) working out a tip (c) speaking a command (d) adding up a bill
8. 8.True or false: taking a photo is an input. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) a pop-up message (d) checking a password
10. 10.True or false: a beep sound is an output. (a) True (b) False
11. 11.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 155; // 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 3 (b) line 1 (c) line 4 (d) line 2
13. 13.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
14. 14.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 171; // 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 3 (b) line 4 (c) line 1 (d) line 2
16. 16.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) a pop-up message (d) a buzz (vibration)
17. 17.True or false: adding up a bill is an input. (a) True (b) False
18. 18.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
19. 19.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) a result on screen (d) sorting the scores
20. 20.Which of these is processing? (a) tapping a button (b) typing your age (c) sorting the scores (d) a pop-up message
21. 21.Which of these is an input? (a) sorting the scores (b) tapping a button (c) a buzz (vibration) (d) a beep sound
22. 22.True or false: sorting the scores is processing. (a) False (b) True
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 44; // 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
24. 24.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.⚙️ What number does this app show?
    let bill = 145; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ 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 2 (b) line 3 (c) line 4 (d) line 1
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 4 (c) line 3 (d) line 1
28. 28.Which of these is an output? (a) speaking a command (b) a beep sound (c) taking a photo (d) typing your age
29. 29.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
30. 30.Which of these is an output? (a) a pop-up message (b) checking a password (c) taking a photo (d) typing your age
31. 31.Which of these is an input? (a) a result on screen (b) sorting the scores (c) taking a photo (d) a pop-up message
32. 32.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
33. 33.⚙️ What number does this app show?
    let bill = 325; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
35. 35.True or false: sorting the scores is an input. (a) False (b) True
36. 36.Which of these is processing? (a) a buzz (vibration) (b) checking a password (c) typing your age (d) taking a photo
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 3; // 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
38. 38.⚙️ 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 3 (b) line 2 (c) line 1
39. 39.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
40. 40.⚙️ What number does this app show?
    let bill = 240; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);

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