App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 758 · 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 adding up a bill an input, processing or an output? (a) processing (b) input (c) output
2. 2.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 35; // 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 2 (b) line 4 (c) line 3 (d) line 1
4. 4.⚙️ What number does this app show?
   let km = 12; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.⚙️ What number does this app show?
   let price = 230; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.True or false: tapping a button is an input. (a) False (b) True
7. 7.True or false: typing your age is an input. (a) True (b) False
8. 8.⚙️ What number does this app show?
   let bill = 154; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
9. 9.Which of these is an input? (a) working out a tip (b) a pop-up message (c) typing your age (d) adding up a bill
10. 10.Which of these is an output? (a) typing your age (b) a buzz (vibration) (c) working out a tip (d) checking a password
11. 11.True or false: a result on screen is an output. (a) True (b) False
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // 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 1 (b) line 2 (c) line 4 (d) line 3
13. 13.True or false: a buzz (vibration) is an input. (a) False (b) True
14. 14.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
15. 15.True or false: a buzz (vibration) is an output. (a) False (b) True
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 256; // 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 4 (c) line 2 (d) line 3
17. 17.Which of these is an output? (a) tapping a button (b) speaking a command (c) a pop-up message (d) adding up a bill
18. 18.⚙️ What number does this app show?
    let bill = 216; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
19. 19.🔍 Which is the odd one out? (a) taking a photo (b) a result on screen (c) speaking a command (d) typing your age
20. 20.Which of these is an input? (a) checking a password (b) tapping a button (c) a buzz (vibration) (d) sorting the scores
21. 21.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
22. 22.True or false: taking a photo is an output. (a) True (b) False
23. 23.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
24. 24.⚙️ 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);
25. 25.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) a result on screen (d) a buzz (vibration)
26. 26.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 126; // 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 2 (c) line 4 (d) line 1
28. 28.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) speaking a command (d) typing your age
29. 29.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
30. 30.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) adding up a bill (d) a pop-up message
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 2 (c) line 4 (d) line 3
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // 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 4 (b) line 1 (c) line 2 (d) line 3
33. 33.⚙️ What number does this app show?
    let bill = 102; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
35. 35.True or false: taking a photo is processing. (a) False (b) True
36. 36.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ What number does this app show?
    let bill = 115; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.⚙️ What number does this app show?
    let price = 310; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
39. 39.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
40. 40.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) typing your age (d) adding up a bill

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