App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 607 · 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.True or false: a result on screen is an input. (a) True (b) False
2. 2.⚙️ What number does this app show?
   let bill = 150; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 72; // 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 1 (b) line 2 (c) line 4 (d) line 3
5. 5.⚙️ 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);
6. 6.⚙️ 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);
7. 7.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
8. 8.⚙️ What number does this app show?
   let price = 450; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a pop-up message (d) speaking a command
10. 10.True or false: adding up a bill is an input. (a) True (b) False
11. 11.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
12. 12.Which of these is an output? (a) tapping a button (b) a pop-up message (c) sorting the scores (d) adding up a bill
13. 13.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
14. 14.⚙️ What number does this app show?
    let bill = 104; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
16. 16.⚙️ What number does this app show?
    let bill = 296; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
17. 17.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
18. 18.Which of these is an output? (a) a result on screen (b) checking a password (c) taking a photo (d) typing your age
19. 19.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) tapping a button (d) adding up a bill
20. 20.True or false: taking a photo is an input. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) a buzz (vibration) (b) sorting the scores (c) a beep sound (d) a pop-up message
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 147; // 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 1 (d) line 4
23. 23.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
24. 24.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.True or false: sorting the scores is processing. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) speaking a command (d) working out a tip
27. 27.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) tapping a button (d) typing your age
28. 28.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) taking a photo (d) speaking a command
29. 29.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) a beep sound (d) a pop-up message
30. 30.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
31. 31.⚙️ What number does this app show?
    let bill = 60; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
33. 33.True or false: working out a tip is processing. (a) True (b) False
34. 34.True or false: speaking a command is processing. (a) True (b) False
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 88; // 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 4 (b) line 1 (c) line 2 (d) line 3
36. 36.⚙️ What number does this app show?
    let bill = 284; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.🔍 Which is the odd one out? (a) a result on screen (b) working out a tip (c) checking a password (d) adding up a bill
38. 38.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) taking a photo (d) adding up a bill
39. 39.⚙️ What number does this app show?
    let bill = 26; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output

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