App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 54 · 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 price = 130; // typed by the user
   let off = 40; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ What number does this app show?
   let bill = 304; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.True or false: taking a photo is an output. (a) False (b) True
4. 4.True or false: adding up a bill is processing. (a) True (b) False
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 207; // 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 1 (c) line 4 (d) line 3
6. 6.⚙️ What number does this app show?
   let price = 520; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
7. 7.Which of these is an output? (a) sorting the scores (b) a result on screen (c) taking a photo (d) working out a tip
8. 8.True or false: sorting the scores is an output. (a) True (b) False
9. 9.True or false: adding up a bill is an output. (a) False (b) True
10. 10.⚙️ What number does this app show?
    let bill = 236; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
11. 11.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) processing (c) input
12. 12.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) a beep sound
13. 13.Which of these is an output? (a) adding up a bill (b) sorting the scores (c) a buzz (vibration) (d) typing your age
14. 14.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
15. 15.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
16. 16.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // typed by the user
    line 2: let qty = 2; // 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
18. 18.Which of these is processing? (a) speaking a command (b) a result on screen (c) sorting the scores (d) typing your age
19. 19.True or false: checking a password is processing. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) a beep sound (d) a buzz (vibration)
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 2 (c) line 1 (d) line 3
22. 22.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
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 3 (c) line 1
24. 24.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
25. 25.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
26. 26.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
28. 28.True or false: working out a tip is processing. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let bill = 33; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
30. 30.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) adding up a bill (d) taking a photo
31. 31.True or false: a buzz (vibration) is processing. (a) False (b) True
32. 32.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.Which of these is an output? (a) a pop-up message (b) working out a tip (c) tapping a button (d) sorting the scores
35. 35.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.True or false: working out a tip is an input. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.🔍 Which is the odd one out? (a) a buzz (vibration) (b) typing your age (c) taking a photo (d) speaking a command
39. 39.Which of these is an input? (a) a pop-up message (b) tapping a button (c) sorting the scores (d) a result on screen
40. 40.True or false: a buzz (vibration) is an input. (a) False (b) True

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