App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 474 · 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) speaking a command (b) working out a tip (c) tapping a button (d) taking a photo
2. 2.⚙️ What number does this app show?
   let price = 420; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 112; // 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 3 (b) line 2 (c) line 1 (d) line 4
4. 4.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
5. 5.⚙️ What number does this app show?
   let bill = 84; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
6. 6.⚙️ 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 1 (b) line 2 (c) line 3
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 235; // typed by the user
   line 2: let friends = 5; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 2 (b) line 3 (c) line 1 (d) line 4
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 204; // 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 2 (b) line 1 (c) line 4 (d) line 3
9. 9.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) output (c) processing
10. 10.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) speaking a command (d) a buzz (vibration)
11. 11.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
12. 12.True or false: taking a photo is an output. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) speaking a command (b) sorting the scores (c) adding up a bill (d) working out a tip
14. 14.True or false: checking a password is an input. (a) False (b) True
15. 15.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
16. 16.True or false: a pop-up message is an output. (a) True (b) False
17. 17.True or false: adding up a bill is processing. (a) False (b) True
18. 18.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.🔍 Which is the odd one out? (a) typing your age (b) a result on screen (c) speaking a command (d) taking a photo
20. 20.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.True or false: speaking a command is an input. (a) True (b) False
23. 23.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
24. 24.True or false: working out a tip is processing. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) typing your age (b) adding up a bill (c) speaking a command (d) tapping a button
26. 26.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) a beep sound (d) typing your age
27. 27.Which of these is an input? (a) adding up a bill (b) working out a tip (c) a pop-up message (d) typing your age
28. 28.Which of these is an output? (a) a result on screen (b) typing your age (c) working out a tip (d) tapping a button
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // 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 4 (b) line 3 (c) line 2 (d) line 1
30. 30.⚙️ What number does this app show?
    let bill = 220; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
33. 33.Which of these is an input? (a) a pop-up message (b) adding up a bill (c) a buzz (vibration) (d) tapping a button
34. 34.⚙️ What number does this app show?
    let bill = 48; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.True or false: a buzz (vibration) is processing. (a) True (b) False
37. 37.⚙️ What number does this app show?
    let price = 240; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
38. 38.Which of these is an output? (a) taking a photo (b) working out a tip (c) a beep sound (d) checking a password
39. 39.True or false: typing your age is processing. (a) False (b) True
40. 40.Which of these is an input? (a) a pop-up message (b) speaking a command (c) a buzz (vibration) (d) sorting the scores

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