App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 29 · 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 km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
2. 2.⚙️ What number does this app show?
   let price = 20; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
3. 3.⚙️ What number does this app show?
   let bill = 51; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 290; // 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 3 (c) line 1 (d) line 4
5. 5.Which of these is an input? (a) speaking a command (b) a result on screen (c) working out a tip (d) adding up a bill
6. 6.Which of these is an output? (a) adding up a bill (b) a result on screen (c) checking a password (d) tapping a button
7. 7.True or false: a beep sound is an output. (a) False (b) True
8. 8.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
9. 9.⚙️ What number does this app show?
   let price = 100; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.⚙️ What number does this app show?
    let bill = 171; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.Which of these is an output? (a) adding up a bill (b) working out a tip (c) speaking a command (d) a pop-up message
12. 12.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
13. 13.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) a result on screen (d) tapping a button
15. 15.Which of these is processing? (a) speaking a command (b) adding up a bill (c) a result on screen (d) tapping a button
16. 16.Which of these is processing? (a) working out a tip (b) a beep sound (c) a result on screen (d) speaking a command
17. 17.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
18. 18.Which of these is an input? (a) checking a password (b) sorting the scores (c) typing your age (d) working out a tip
19. 19.True or false: typing your age is processing. (a) False (b) True
20. 20.Which of these is an input? (a) a result on screen (b) adding up a bill (c) a beep sound (d) taking a photo
21. 21.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 208; // 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 4 (b) line 2 (c) line 3 (d) line 1
24. 24.🔍 Which is the odd one out? (a) a buzz (vibration) (b) typing your age (c) a result on screen (d) a beep sound
25. 25.⚙️ What number does this app show?
    let price = 40; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
26. 26.Which of these is an output? (a) a beep sound (b) speaking a command (c) sorting the scores (d) checking a password
27. 27.⚙️ 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);
28. 28.True or false: sorting the scores is an output. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let bill = 168; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 45; // 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
31. 31.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.⚙️ What number does this app show?
    let bill = 360; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.🔍 Which is the odd one out? (a) taking a photo (b) a buzz (vibration) (c) a beep sound (d) a pop-up message
35. 35.True or false: typing your age is an input. (a) False (b) True
36. 36.True or false: working out a tip is processing. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // 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 2 (b) line 1 (c) line 4 (d) line 3
39. 39.⚙️ 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 3 (b) line 2 (c) line 4 (d) line 1
40. 40.Which of these is processing? (a) typing your age (b) checking a password (c) a beep sound (d) a result on screen

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