App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 347 · 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.🔍 Which is the odd one out? (a) a result on screen (b) taking a photo (c) tapping a button (d) typing your age
2. 2.⚙️ What number does this app show?
   let bill = 22; // typed by the user
   let friends = 2; // typed by the user
   let share = bill / friends;
   show(share);
3. 3.⚙️ What number does this app show?
   let price = 150; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.⚙️ What number does this app show?
   let bill = 180; // typed by the user
   let friends = 4; // typed by the user
   let share = bill / friends;
   show(share);
5. 5.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 42; // 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 1 (b) line 4 (c) line 3 (d) line 2
7. 7.⚙️ 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 1 (c) line 2
8. 8.True or false: working out a tip is an input. (a) True (b) False
9. 9.⚙️ What number does this app show?
   let price = 580; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.True or false: typing your age is an output. (a) True (b) False
11. 11.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
12. 12.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
13. 13.⚙️ What number does this app show?
    let price = 510; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
14. 14.Which of these is an input? (a) a result on screen (b) taking a photo (c) adding up a bill (d) checking a password
15. 15.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) speaking a command (d) working out a tip
16. 16.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
17. 17.True or false: typing your age is processing. (a) True (b) False
18. 18.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
19. 19.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) tapping a button (d) speaking a command
20. 20.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 2 (b) line 4 (c) line 1 (d) line 3
22. 22.True or false: adding up a bill is an output. (a) True (b) False
23. 23.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
25. 25.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ What number does this app show?
    let bill = 128; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
27. 27.⚙️ 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);
28. 28.True or false: sorting the scores is an output. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) checking a password (d) working out a tip
30. 30.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
31. 31.⚙️ What number does this app show?
    let bill = 280; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.True or false: taking a photo is an input. (a) False (b) True
33. 33.Which of these is an output? (a) working out a tip (b) taking a photo (c) typing your age (d) a buzz (vibration)
34. 34.Which of these is processing? (a) typing your age (b) speaking a command (c) tapping a button (d) adding up a bill
35. 35.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) processing (c) input
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 300; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // 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
38. 38.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) taking a photo (d) a pop-up message
39. 39.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
40. 40.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing

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