App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 195 · 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 line does the processing (works out the answer)?
   line 1: let price = 280; // 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 3 (c) line 2 (d) line 4
2. 2.True or false: taking a photo is an output. (a) True (b) False
3. 3.⚙️ What number does this app show?
   let km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.⚙️ What number does this app show?
   let km = 14; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.⚙️ 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 4 (b) line 2 (c) line 1 (d) line 3
6. 6.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
7. 7.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
8. 8.🔍 Which is the odd one out? (a) working out a tip (b) tapping a button (c) speaking a command (d) typing your age
9. 9.⚙️ What number does this app show?
   let bill = 300; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) adding up a bill
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
12. 12.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
13. 13.True or false: working out a tip is an output. (a) True (b) False
14. 14.Which of these is an input? (a) a pop-up message (b) working out a tip (c) typing your age (d) adding up a bill
15. 15.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
16. 16.True or false: adding up a bill is an input. (a) True (b) False
17. 17.True or false: working out a tip is processing. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) taking a photo (d) a beep sound
19. 19.⚙️ 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 1 (c) line 2 (d) line 4
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 4 (b) line 2 (c) line 3 (d) line 1
21. 21.True or false: a buzz (vibration) is an output. (a) False (b) True
22. 22.True or false: a beep sound is processing. (a) True (b) False
23. 23.⚙️ What number does this app show?
    let bill = 120; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.⚙️ 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 2 (b) line 1 (c) line 3
25. 25.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) checking a password (d) speaking a command
27. 27.Which of these is an output? (a) tapping a button (b) sorting the scores (c) a beep sound (d) typing your age
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 1 (b) line 2 (c) line 3 (d) line 4
29. 29.⚙️ What number does this app show?
    let bill = 108; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
31. 31.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
32. 32.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
33. 33.Which of these is processing? (a) typing your age (b) tapping a button (c) a pop-up message (d) adding up a bill
34. 34.True or false: tapping a button is processing. (a) False (b) True
35. 35.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 208; // 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 2 (d) line 4
37. 37.True or false: a result on screen is an output. (a) False (b) True
38. 38.Which of these is processing? (a) a beep sound (b) sorting the scores (c) speaking a command (d) typing your age
39. 39.True or false: sorting the scores is an output. (a) True (b) False
40. 40.Which of these is an output? (a) typing your age (b) taking a photo (c) checking a password (d) a result on screen

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