App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 355 · 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 bill = 200; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 140; // 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
3. 3.True or false: checking a password is processing. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) a buzz (vibration) (d) sorting the scores
5. 5.True or false: a pop-up message is an output. (a) True (b) False
6. 6.⚙️ What number does this app show?
   let price = 120; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.🔍 Which is the odd one out? (a) tapping a button (b) adding up a bill (c) sorting the scores (d) checking a password
8. 8.⚙️ What number does this app show?
   let price = 330; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 120; // typed by the user
   line 2: let off = 10; // 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
10. 10.🔍 Which is the odd one out? (a) speaking a command (b) checking a password (c) adding up a bill (d) working out a tip
11. 11.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 2 (c) line 4 (d) line 3
13. 13.True or false: working out a tip is processing. (a) False (b) True
14. 14.Which of these is an input? (a) a pop-up message (b) checking a password (c) sorting the scores (d) taking a photo
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 60; // 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 4 (c) line 3 (d) line 2
16. 16.🔍 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
17. 17.🔍 Which is the odd one out? (a) a result on screen (b) checking a password (c) a beep sound (d) a buzz (vibration)
18. 18.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
19. 19.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) tapping a button (d) a beep sound
20. 20.🔍 Which is the odd one out? (a) tapping a button (b) sorting the scores (c) typing your age (d) speaking a command
21. 21.True or false: sorting the scores is an output. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) working out a tip (c) sorting the scores (d) adding up a bill
23. 23.Which of these is an input? (a) adding up a bill (b) a result on screen (c) a beep sound (d) typing your age
24. 24.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
25. 25.🔍 Which is the odd one out? (a) taking a photo (b) a pop-up message (c) typing your age (d) tapping a button
26. 26.🔍 Which is the odd one out? (a) typing your age (b) checking a password (c) working out a tip (d) adding up a bill
27. 27.Which of these is processing? (a) a buzz (vibration) (b) working out a tip (c) speaking a command (d) a pop-up message
28. 28.Which of these is an output? (a) a beep sound (b) taking a photo (c) adding up a bill (d) sorting the scores
29. 29.⚙️ 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 2 (b) line 4 (c) line 3 (d) line 1
30. 30.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
31. 31.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 1 (b) line 4 (c) line 3 (d) line 2
33. 33.Which of these is processing? (a) a result on screen (b) a buzz (vibration) (c) checking a password (d) tapping a button
34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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 2 (b) line 1 (c) line 3 (d) line 4
35. 35.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.True or false: tapping a button is an output. (a) True (b) False
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 2 (c) line 3 (d) line 1
38. 38.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) taking a photo
39. 39.⚙️ What number does this app show?
    let bill = 208; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);

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