App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 974 · 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 = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
3. 3.True or false: a pop-up message is an output. (a) True (b) False
4. 4.⚙️ What number does this app show?
   let bill = 148; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 78; // 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 4 (b) line 1 (c) line 3 (d) line 2
6. 6.⚙️ What number does this app show?
   let price = 50; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
7. 7.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
8. 8.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) tapping a button (d) sorting the scores
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 228; // 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
10. 10.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a beep sound (d) typing your age
11. 11.True or false: sorting the scores is an input. (a) True (b) False
12. 12.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
13. 13.Which of these is an input? (a) typing your age (b) adding up a bill (c) a beep sound (d) checking a password
14. 14.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
15. 15.⚙️ What number does this app show?
    let bill = 198; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
17. 17.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
18. 18.🔍 Which is the odd one out? (a) typing your age (b) a buzz (vibration) (c) tapping a button (d) speaking a command
19. 19.⚙️ 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);
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
21. 21.Which of these is an output? (a) working out a tip (b) adding up a bill (c) a pop-up message (d) sorting the scores
22. 22.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
23. 23.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) adding up a bill (d) speaking a command
24. 24.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
25. 25.Which of these is an input? (a) adding up a bill (b) a result on screen (c) a beep sound (d) tapping a button
26. 26.⚙️ 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);
27. 27.True or false: a buzz (vibration) is an input. (a) False (b) True
28. 28.True or false: typing your age is an output. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a beep sound (c) working out a tip (d) a result on screen
30. 30.⚙️ 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 1 (b) line 2 (c) line 3
31. 31.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 3 (b) line 1 (c) line 4 (d) line 2
34. 34.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) checking a password (d) taking a photo
35. 35.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.⚙️ 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);
37. 37.True or false: tapping a button is an input. (a) True (b) False
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // 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 4 (b) line 3 (c) line 1 (d) line 2
39. 39.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
40. 40.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);

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