App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 495 · 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 price = 340; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.🔍 Which is the odd one out? (a) a pop-up message (b) tapping a button (c) a beep sound (d) a buzz (vibration)
3. 3.Which of these is an output? (a) taking a photo (b) a buzz (vibration) (c) typing your age (d) sorting the scores
4. 4.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
5. 5.⚙️ What number does this app show?
   let km = 15; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) checking a password (d) a beep sound
7. 7.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
8. 8.⚙️ What number does this app show?
   let price = 420; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.Which of these is an output? (a) sorting the scores (b) a result on screen (c) taking a photo (d) typing your age
10. 10.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
11. 11.True or false: a beep sound is an output. (a) True (b) False
12. 12.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
13. 13.Which of these is an input? (a) a beep sound (b) adding up a bill (c) typing your age (d) working out a tip
14. 14.⚙️ What number does this app show?
    let price = 350; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.True or false: adding up a bill is an output. (a) False (b) True
16. 16.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
17. 17.⚙️ What number does this app show?
    let bill = 40; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.True or false: taking a photo is an input. (a) False (b) True
19. 19.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
20. 20.True or false: taking a photo is processing. (a) False (b) True
21. 21.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) working out a tip (d) a beep sound
23. 23.Which of these is an output? (a) sorting the scores (b) tapping a button (c) adding up a bill (d) a pop-up message
24. 24.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
25. 25.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) adding up a bill
26. 26.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
27. 27.Which of these is processing? (a) a result on screen (b) speaking a command (c) adding up a bill (d) a beep sound
28. 28.True or false: adding up a bill is an input. (a) True (b) False
29. 29.True or false: tapping a button is processing. (a) False (b) True
30. 30.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
31. 31.Which of these is an input? (a) taking a photo (b) adding up a bill (c) a beep sound (d) a result on screen
32. 32.True or false: a pop-up message is processing. (a) True (b) False
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 3 (c) line 1 (d) line 2
34. 34.⚙️ What number does this app show?
    let bill = 300; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 4 (c) line 3 (d) line 1
36. 36.⚙️ 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 1 (c) line 3 (d) line 4
37. 37.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
38. 38.True or false: a result on screen is processing. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) a result on screen (d) speaking a command
40. 40.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);

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