App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 286 · 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: sorting the scores is processing. (a) False (b) True
2. 2.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
3. 3.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) speaking a command (d) adding up a bill
4. 4.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 25; // typed by the user
   line 2: let qty = 4; // 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
6. 6.⚙️ What number does this app show?
   let bill = 195; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.True or false: a buzz (vibration) is an input. (a) True (b) False
8. 8.⚙️ What number does this app show?
   let price = 55; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
9. 9.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
10. 10.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
11. 11.True or false: a result on screen is an input. (a) True (b) False
12. 12.⚙️ What number does this app show?
    let bill = 154; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
13. 13.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
14. 14.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
16. 16.Which of these is an input? (a) a pop-up message (b) adding up a bill (c) speaking a command (d) a result on screen
17. 17.True or false: a beep sound is processing. (a) False (b) True
18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
19. 19.True or false: a buzz (vibration) is an output. (a) False (b) True
20. 20.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
21. 21.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
22. 22.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
23. 23.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
24. 24.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
25. 25.True or false: speaking a command is an output. (a) False (b) True
26. 26.Which of these is processing? (a) a beep sound (b) a pop-up message (c) typing your age (d) sorting the scores
27. 27.Which of these is an output? (a) sorting the scores (b) speaking a command (c) typing your age (d) a beep sound
28. 28.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
29. 29.True or false: a pop-up message is processing. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) a buzz (vibration) (b) checking a password (c) adding up a bill (d) working out a tip
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 4 (c) line 2 (d) line 3
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 3 (c) line 1
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
34. 34.Which of these is processing? (a) adding up a bill (b) a pop-up message (c) a beep sound (d) speaking a command
35. 35.True or false: tapping a button is an output. (a) False (b) True
36. 36.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
37. 37.True or false: a beep sound is an output. (a) False (b) True
38. 38.True or false: taking a photo is an input. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) checking a password (d) a pop-up message
40. 40.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);

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