App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 319 · 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: a pop-up message is an output. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) a result on screen
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 450; // 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 3 (c) line 4 (d) line 2
4. 4.⚙️ What number does this app show?
   let price = 95; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
5. 5.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
6. 6.True or false: a buzz (vibration) is an input. (a) True (b) False
7. 7.⚙️ What number does this app show?
   let bill = 57; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 350; // 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 1 (b) line 4 (c) line 2 (d) line 3
10. 10.Which of these is processing? (a) tapping a button (b) speaking a command (c) taking a photo (d) working out a tip
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 4 (d) line 3
12. 12.True or false: tapping a button is processing. (a) True (b) False
13. 13.⚙️ 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 2 (c) line 1
14. 14.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
15. 15.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
16. 16.Which of these is an input? (a) a result on screen (b) working out a tip (c) taking a photo (d) a beep sound
17. 17.⚙️ What number does this app show?
    let bill = 102; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
18. 18.True or false: a buzz (vibration) is processing. (a) True (b) False
19. 19.True or false: taking a photo is an input. (a) False (b) True
20. 20.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
21. 21.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.🔍 Which is the odd one out? (a) a buzz (vibration) (b) working out a tip (c) checking a password (d) adding up a bill
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 310; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 4 (b) line 1 (c) line 2 (d) line 3
24. 24.🔍 Which is the odd one out? (a) working out a tip (b) typing your age (c) checking a password (d) adding up a bill
25. 25.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) speaking a command (d) checking a password
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 96; // 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 1 (b) line 3 (c) line 2 (d) line 4
27. 27.⚙️ What number does this app show?
    let price = 95; // 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 = 20; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
29. 29.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) speaking a command (d) sorting the scores
30. 30.True or false: a pop-up message is an input. (a) True (b) False
31. 31.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) input (c) output
32. 32.True or false: a beep sound is an output. (a) False (b) True
33. 33.Which of these is an output? (a) tapping a button (b) checking a password (c) a result on screen (d) sorting the scores
34. 34.Which of these is an input? (a) checking a password (b) a beep sound (c) speaking a command (d) a buzz (vibration)
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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
36. 36.Which of these is an input? (a) typing your age (b) checking a password (c) a beep sound (d) adding up a bill
37. 37.True or false: working out a tip is an input. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) sorting the scores (b) taking a photo (c) typing your age (d) speaking a command
39. 39.True or false: checking a password is an input. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) checking a password (b) a pop-up message (c) sorting the scores (d) adding up a bill

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