App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 110 · 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.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
2. 2.⚙️ What number does this app show?
   let price = 300; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.🔍 Which is the odd one out? (a) typing your age (b) a result on screen (c) tapping a button (d) taking a photo
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 20; // 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 1 (b) line 4 (c) line 3 (d) line 2
5. 5.⚙️ What number does this app show?
   let price = 230; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 40; // 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 3 (b) line 4 (c) line 2 (d) line 1
7. 7.Which of these is an output? (a) a buzz (vibration) (b) sorting the scores (c) speaking a command (d) typing your age
8. 8.True or false: a result on screen is processing. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) a beep sound (b) working out a tip (c) sorting the scores (d) adding up a bill
10. 10.True or false: tapping a button is an input. (a) True (b) False
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 152; // 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 1 (b) line 2 (c) line 4 (d) line 3
12. 12.Which of these is an output? (a) a result on screen (b) tapping a button (c) working out a tip (d) sorting the scores
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 580; // typed by the user
    line 2: let off = 50; // 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
14. 14.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.⚙️ What number does this app show?
    let bill = 72; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 138; // 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 4 (c) line 3 (d) line 1
17. 17.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) speaking a command (d) working out a tip
18. 18.True or false: a buzz (vibration) is an output. (a) False (b) True
19. 19.True or false: taking a photo is an output. (a) False (b) True
20. 20.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
21. 21.Which of these is processing? (a) a result on screen (b) working out a tip (c) tapping a button (d) a beep sound
22. 22.True or false: a beep sound is an input. (a) False (b) True
23. 23.⚙️ What number does this app show?
    let bill = 132; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
24. 24.Which of these is an output? (a) taking a photo (b) checking a password (c) a pop-up message (d) speaking a command
25. 25.Which of these is an input? (a) a beep sound (b) tapping a button (c) a buzz (vibration) (d) adding up a bill
26. 26.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
27. 27.True or false: taking a photo is an input. (a) True (b) False
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 24; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 4 (c) line 1 (d) line 2
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 560; // 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 2 (c) line 3 (d) line 1
30. 30.True or false: speaking a command is an output. (a) True (b) False
31. 31.True or false: working out a tip is processing. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) a pop-up message (b) tapping a button (c) typing your age (d) taking a photo
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 2 (b) line 1 (c) line 3 (d) line 4
34. 34.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
35. 35.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
36. 36.True or false: a beep sound is processing. (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 = 5; // 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.Which of these is an input? (a) a buzz (vibration) (b) taking a photo (c) sorting the scores (d) a result on screen
39. 39.True or false: a result on screen is an output. (a) False (b) True
40. 40.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output

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