App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 22 · 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.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // 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 1 (b) line 2 (c) line 3 (d) line 4
2. 2.⚙️ What number does this app show?
   let price = 65; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
3. 3.Which of these is processing? (a) checking a password (b) speaking a command (c) taking a photo (d) a buzz (vibration)
4. 4.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
5. 5.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) tapping a button (d) taking a photo
6. 6.Which of these is an output? (a) adding up a bill (b) sorting the scores (c) a beep sound (d) working out a tip
7. 7.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
8. 8.True or false: speaking a command is processing. (a) True (b) False
9. 9.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
10. 10.⚙️ 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);
11. 11.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
12. 12.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) checking a password (d) typing your age
13. 13.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) typing your age (d) a result on screen
14. 14.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.Which of these is processing? (a) a beep sound (b) sorting the scores (c) typing your age (d) a pop-up message
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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
17. 17.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
18. 18.Which of these is an input? (a) sorting the scores (b) checking a password (c) tapping a button (d) adding up a bill
19. 19.Which of these is an input? (a) adding up a bill (b) a beep sound (c) working out a tip (d) speaking a command
20. 20.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
21. 21.Which of these is an output? (a) typing your age (b) a pop-up message (c) tapping a button (d) working out a tip
22. 22.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
23. 23.Which of these is an output? (a) typing your age (b) checking a password (c) adding up a bill (d) a result on screen
24. 24.⚙️ What number does this app show?
    let bill = 240; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.True or false: tapping a button is an input. (a) False (b) True
26. 26.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
28. 28.⚙️ What number does this app show?
    let bill = 190; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
29. 29.True or false: taking a photo is an input. (a) False (b) True
30. 30.True or false: speaking a command is an input. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) checking a password (d) a pop-up message
32. 32.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
33. 33.🔍 Which is the odd one out? (a) sorting the scores (b) a result on screen (c) a buzz (vibration) (d) a beep sound
34. 34.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) working out a tip (d) typing your age
35. 35.⚙️ What number does this app show?
    let price = 350; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
36. 36.True or false: a result on screen is an output. (a) False (b) True
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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 4 (b) line 1 (c) line 2 (d) line 3
38. 38.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 240; // 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 2 (b) line 3 (c) line 1 (d) line 4

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