App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 887 · 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 km = 3; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.True or false: tapping a button is an input. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) sorting the scores (d) a beep sound
4. 4.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) typing your age (d) adding up a bill
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 185; // 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 1 (b) line 2 (c) line 3 (d) line 4
6. 6.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
7. 7.⚙️ What number does this app show?
   let price = 75; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ What number does this app show?
   let bill = 100; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 100; // 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 2 (b) line 4 (c) line 1 (d) line 3
10. 10.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
11. 11.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
12. 12.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) sorting the scores (d) checking a password
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 price = 45; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
15. 15.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
16. 16.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
17. 17.Which of these is processing? (a) a pop-up message (b) typing your age (c) a result on screen (d) adding up a bill
18. 18.⚙️ What number does this app show?
    let price = 430; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
19. 19.Which of these is an output? (a) checking a password (b) a buzz (vibration) (c) taking a photo (d) sorting the scores
20. 20.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) working out a tip (d) sorting the scores
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // 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 3 (c) line 1 (d) line 4
22. 22.True or false: a beep sound is processing. (a) True (b) False
23. 23.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.Which of these is an output? (a) typing your age (b) tapping a button (c) a pop-up message (d) speaking a command
25. 25.True or false: working out a tip is processing. (a) False (b) True
26. 26.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
27. 27.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
29. 29.⚙️ 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);
30. 30.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
31. 31.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) a beep sound
33. 33.True or false: a beep sound is an input. (a) True (b) False
34. 34.True or false: taking a photo is an input. (a) True (b) False
35. 35.Which of these is an input? (a) taking a photo (b) a pop-up message (c) sorting the scores (d) adding up a bill
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 106; // 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 2 (b) line 4 (c) line 3 (d) line 1
37. 37.⚙️ What number does this app show?
    let bill = 94; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 1 (c) line 4 (d) line 3
39. 39.Which of these is an output? (a) checking a password (b) a result on screen (c) tapping a button (d) taking a photo
40. 40.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) working out a tip (d) adding up a bill

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