App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 774 · 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: speaking a command is an input. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) adding up a bill
3. 3.Which of these is an input? (a) tapping a button (b) a beep sound (c) a pop-up message (d) adding up a bill
4. 4.⚙️ What number does this app show?
   let price = 50; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
6. 6.🔍 Which is the odd one out? (a) a beep sound (b) working out a tip (c) a result on screen (d) a pop-up message
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 65; // 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 1 (c) line 2 (d) line 3
8. 8.Which of these is an output? (a) typing your age (b) checking a password (c) a buzz (vibration) (d) working out a tip
9. 9.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) output (c) input
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 2 (c) line 3 (d) line 1
11. 11.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) checking a password (d) working out a tip
13. 13.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
15. 15.True or false: working out a tip is an input. (a) False (b) True
16. 16.True or false: speaking a command is processing. (a) False (b) True
17. 17.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) checking a password
19. 19.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) a pop-up message (d) tapping a button
21. 21.True or false: sorting the scores is an input. (a) False (b) True
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 170; // 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
23. 23.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) a result on screen (d) tapping a button
24. 24.True or false: tapping a button is processing. (a) True (b) False
25. 25.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
26. 26.⚙️ What number does this app show?
    let price = 110; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
28. 28.⚙️ 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);
29. 29.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
30. 30.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
31. 31.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
32. 32.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
33. 33.Which of these is processing? (a) a pop-up message (b) a beep sound (c) a result on screen (d) checking a password
34. 34.⚙️ 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);
35. 35.Which of these is an output? (a) typing your age (b) working out a tip (c) a result on screen (d) speaking a command
36. 36.Which of these is an output? (a) working out a tip (b) tapping a button (c) a pop-up message (d) sorting the scores
37. 37.⚙️ 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 4 (c) line 3 (d) line 1
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 4 (c) line 2 (d) line 3
39. 39.True or false: a buzz (vibration) is an output. (a) False (b) True
40. 40.⚙️ What number does this app show?
    let price = 150; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);

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