App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 383 · 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 price = 550; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
3. 3.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) typing your age (d) adding up a bill
4. 4.⚙️ What number does this app show?
   let price = 470; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
6. 6.🔍 Which is the odd one out? (a) speaking a command (b) a buzz (vibration) (c) typing your age (d) taking a photo
7. 7.⚙️ What number does this app show?
   let price = 100; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 45; // 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 2 (c) line 4 (d) line 3
9. 9.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
10. 10.⚙️ What number does this app show?
    let bill = 93; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) adding up a bill
12. 12.True or false: adding up a bill is processing. (a) True (b) False
13. 13.Which of these is an input? (a) a result on screen (b) working out a tip (c) a pop-up message (d) typing your age
14. 14.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
15. 15.Which of these is an input? (a) checking a password (b) a beep sound (c) speaking a command (d) adding up a bill
16. 16.⚙️ 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);
17. 17.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) a result on screen (d) typing your age
18. 18.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.Which of these is processing? (a) checking a password (b) a beep sound (c) a result on screen (d) tapping a button
20. 20.True or false: a result on screen is an output. (a) False (b) True
21. 21.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
22. 22.True or false: tapping a button is processing. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) tapping a button (d) typing your age
24. 24.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
25. 25.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) tapping a button (d) adding up a bill
26. 26.Which of these is processing? (a) speaking a command (b) a result on screen (c) a beep sound (d) adding up a bill
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 270; // 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 1 (b) line 2 (c) line 4 (d) line 3
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 1 (c) line 4 (d) line 3
29. 29.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
30. 30.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
31. 31.Which of these is an input? (a) working out a tip (b) taking a photo (c) a beep sound (d) checking a password
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 570; // 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 1 (c) line 4 (d) line 2
33. 33.⚙️ 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 3 (b) line 1 (c) line 2
34. 34.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a result on screen (c) checking a password (d) a beep sound
35. 35.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
36. 36.True or false: adding up a bill is an input. (a) True (b) False
37. 37.True or false: sorting the scores is processing. (a) False (b) True
38. 38.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ What number does this app show?
    let bill = 24; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing

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