App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 964 · 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 bill = 140; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.True or false: speaking a command is an input. (a) True (b) False
3. 3.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
4. 4.Which of these is an output? (a) a pop-up message (b) working out a tip (c) tapping a button (d) typing your age
5. 5.Which of these is processing? (a) typing your age (b) a pop-up message (c) working out a tip (d) a beep sound
6. 6.Which of these is processing? (a) typing your age (b) a beep sound (c) adding up a bill (d) tapping a button
7. 7.True or false: typing your age is an output. (a) False (b) True
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 120; // typed by the user
   line 2: let off = 40; // 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
9. 9.True or false: working out a tip is an input. (a) True (b) False
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 4 (b) line 1 (c) line 2 (d) line 3
11. 11.True or false: a result on screen is processing. (a) True (b) False
12. 12.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
13. 13.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
14. 14.Which of these is an input? (a) tapping a button (b) adding up a bill (c) a result on screen (d) checking a password
15. 15.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) sorting the scores (d) taking a photo
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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
17. 17.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) typing your age (d) speaking a command
18. 18.🔍 Which is the odd one out? (a) sorting the scores (b) a pop-up message (c) checking a password (d) working out a tip
19. 19.⚙️ 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 2 (b) line 1 (c) line 3
20. 20.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
21. 21.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
22. 22.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.⚙️ What number does this app show?
    let bill = 260; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a pop-up message (d) adding up a bill
25. 25.True or false: a beep sound is an output. (a) True (b) False
26. 26.True or false: speaking a command is an output. (a) True (b) False
27. 27.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
28. 28.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
29. 29.🔍 Which is the odd one out? (a) a result on screen (b) sorting the scores (c) a beep sound (d) a buzz (vibration)
30. 30.⚙️ What number does this app show?
    let bill = 375; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ What number does this app show?
    let bill = 76; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
33. 33.True or false: a pop-up message is an input. (a) True (b) False
34. 34.⚙️ What number does this app show?
    let price = 500; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
35. 35.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.⚙️ What number does this app show?
    let bill = 34; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ What number does this app show?
    let bill = 88; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
39. 39.True or false: a buzz (vibration) is an output. (a) False (b) True
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 330; // 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 2 (b) line 3 (c) line 1 (d) line 4

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