App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 988 · 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) a pop-up message (b) taking a photo (c) typing your age (d) speaking a command
2. 2.⚙️ 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);
3. 3.⚙️ What number does this app show?
   let price = 55; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 72; // 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
5. 5.⚙️ 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 2 (b) line 1 (c) line 3 (d) line 4
6. 6.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
7. 7.⚙️ What number does this app show?
   let price = 55; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
8. 8.🔍 Which is the odd one out? (a) working out a tip (b) tapping a button (c) taking a photo (d) speaking a command
9. 9.⚙️ What number does this app show?
   let bill = 52; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 220; // typed by the user
    line 2: let off = 40; // 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
11. 11.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
12. 12.Which of these is processing? (a) working out a tip (b) a beep sound (c) typing your age (d) a pop-up message
13. 13.Which of these is an output? (a) tapping a button (b) working out a tip (c) a buzz (vibration) (d) speaking a command
14. 14.Which of these is processing? (a) adding up a bill (b) a pop-up message (c) speaking a command (d) typing your age
15. 15.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
16. 16.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.Which of these is an output? (a) sorting the scores (b) checking a password (c) speaking a command (d) a result on screen
18. 18.⚙️ 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 1 (b) line 2 (c) line 4 (d) line 3
19. 19.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
20. 20.True or false: taking a photo is processing. (a) True (b) False
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
22. 22.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) checking a password
23. 23.⚙️ What number does this app show?
    let bill = 153; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.🔍 Which is the odd one out? (a) taking a photo (b) sorting the scores (c) typing your age (d) tapping a button
25. 25.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
26. 26.True or false: checking a password is processing. (a) False (b) True
27. 27.Which of these is an input? (a) tapping a button (b) sorting the scores (c) working out a tip (d) adding up a bill
28. 28.True or false: sorting the scores is an input. (a) True (b) False
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 560; // 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 2 (c) line 4 (d) line 3
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 264; // 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 4 (c) line 2 (d) line 3
31. 31.🔍 Which is the odd one out? (a) adding up a bill (b) a result on screen (c) working out a tip (d) sorting the scores
32. 32.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) adding up a bill (d) speaking a command
33. 33.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
34. 34.True or false: taking a photo is an output. (a) False (b) True
35. 35.True or false: typing your age is processing. (a) True (b) False
36. 36.Which of these is an input? (a) a buzz (vibration) (b) checking a password (c) sorting the scores (d) taking a photo
37. 37.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 300; // 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 3 (b) line 2 (c) line 1 (d) line 4
39. 39.⚙️ What number does this app show?
    let bill = 80; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ What number does this app show?
    let bill = 300; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);

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