App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 655 · 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 is the odd one out? (a) a result on screen (b) a pop-up message (c) working out a tip (d) a beep sound
2. 2.⚙️ What number does this app show?
   let price = 60; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
3. 3.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) a result on screen (d) typing your age
4. 4.True or false: speaking a command is processing. (a) True (b) False
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 10; // 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 1 (b) line 4 (c) line 2 (d) line 3
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 270; // 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 2 (b) line 1 (c) line 4 (d) line 3
7. 7.⚙️ What number does this app show?
   let price = 570; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 95; // 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 2 (c) line 4 (d) line 1
9. 9.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
10. 10.Which of these is an output? (a) a beep sound (b) checking a password (c) adding up a bill (d) tapping a button
11. 11.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) taking a photo (d) speaking a command
13. 13.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
14. 14.True or false: taking a photo is processing. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) a beep sound (d) a pop-up message
16. 16.True or false: working out a tip is processing. (a) False (b) True
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // 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 3 (b) line 1 (c) line 4 (d) line 2
18. 18.Which of these is an input? (a) sorting the scores (b) a beep sound (c) typing your age (d) checking a password
19. 19.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
20. 20.🔍 Which is the odd one out? (a) a result on screen (b) a beep sound (c) checking a password (d) a buzz (vibration)
21. 21.Which of these is an input? (a) taking a photo (b) working out a tip (c) a result on screen (d) a buzz (vibration)
22. 22.True or false: tapping a button is an input. (a) False (b) True
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
24. 24.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 2 (c) line 3 (d) line 1
26. 26.Which of these is an input? (a) a beep sound (b) tapping a button (c) working out a tip (d) checking a password
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 292; // typed by the user
    line 2: let friends = 4; // 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
28. 28.True or false: a beep sound is an input. (a) True (b) False
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 2 (d) line 3
30. 30.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
31. 31.⚙️ What number does this app show?
    let bill = 248; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) typing your age (d) tapping a button
33. 33.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
34. 34.True or false: speaking a command is an output. (a) True (b) False
35. 35.Which of these is an input? (a) checking a password (b) a beep sound (c) speaking a command (d) sorting the scores
36. 36.⚙️ What number does this app show?
    let bill = 144; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.Which of these is an output? (a) sorting the scores (b) a pop-up message (c) taking a photo (d) adding up a bill
38. 38.True or false: taking a photo is an input. (a) False (b) True
39. 39.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
40. 40.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);

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