App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 250 · 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 = 250; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
2. 2.⚙️ What number does this app show?
   let km = 11; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.True or false: working out a tip is processing. (a) True (b) False
4. 4.⚙️ What number does this app show?
   let price = 140; // typed by the user
   let off = 30; // typed by the user
   let pay = price - off;
   show(pay);
5. 5.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
6. 6.True or false: a buzz (vibration) is an output. (a) False (b) True
7. 7.Which of these is an input? (a) a beep sound (b) checking a password (c) working out a tip (d) taking a photo
8. 8.🔍 Which is the odd one out? (a) working out a tip (b) taking a photo (c) typing your age (d) tapping a button
9. 9.⚙️ What number does this app show?
   let price = 260; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.🔍 Which is the odd one out? (a) checking a password (b) tapping a button (c) taking a photo (d) typing your age
11. 11.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
12. 12.⚙️ What number does this app show?
    let price = 270; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
14. 14.True or false: working out a tip is an input. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) a buzz (vibration) (b) speaking a command (c) typing your age (d) tapping a button
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 92; // 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 3 (d) line 4
17. 17.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 4 (b) line 3 (c) line 1 (d) line 2
19. 19.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
20. 20.True or false: tapping a button is an input. (a) True (b) False
21. 21.True or false: adding up a bill is processing. (a) True (b) False
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 3 (b) line 4 (c) line 1 (d) line 2
23. 23.True or false: a result on screen is an input. (a) False (b) True
24. 24.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
25. 25.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
26. 26.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
27. 27.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
28. 28.True or false: adding up a bill is an input. (a) False (b) True
29. 29.Which of these is an input? (a) sorting the scores (b) typing your age (c) adding up a bill (d) checking a password
30. 30.⚙️ What number does this app show?
    let price = 240; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.🔍 Which is the odd one out? (a) sorting the scores (b) a pop-up message (c) working out a tip (d) checking a password
32. 32.True or false: a buzz (vibration) is processing. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) speaking a command (b) typing your age (c) taking a photo (d) adding up a bill
34. 34.⚙️ What number does this app show?
    let bill = 116; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
36. 36.🔍 Which is the odd one out? (a) a result on screen (b) checking a password (c) adding up a bill (d) sorting the scores
37. 37.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) working out a tip (d) speaking a command
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 146; // 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 2 (b) line 4 (c) line 3 (d) line 1
39. 39.Which of these is processing? (a) a result on screen (b) a beep sound (c) adding up a bill (d) typing your age
40. 40.Which of these is an input? (a) tapping a button (b) a beep sound (c) a buzz (vibration) (d) adding up a bill

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