App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 949 · 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 = 25; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
2. 2.🔍 Which is the odd one out? (a) typing your age (b) taking a photo (c) a beep sound (d) speaking a command
3. 3.⚙️ What number does this app show?
   let km = 7; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 4; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
6. 6.Which of these is processing? (a) a pop-up message (b) working out a tip (c) speaking a command (d) taking a photo
7. 7.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
9. 9.Which of these is processing? (a) a beep sound (b) sorting the scores (c) speaking a command (d) typing your age
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 1 (b) line 2 (c) line 3 (d) line 4
11. 11.Which of these is an input? (a) typing your age (b) sorting the scores (c) a buzz (vibration) (d) working out a tip
12. 12.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) a buzz (vibration) (d) a result on screen
13. 13.⚙️ What number does this app show?
    let bill = 30; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
14. 14.True or false: checking a password is an output. (a) True (b) False
15. 15.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
16. 16.Which of these is an input? (a) adding up a bill (b) a beep sound (c) tapping a button (d) working out a tip
17. 17.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
18. 18.Which of these is an output? (a) typing your age (b) speaking a command (c) a beep sound (d) adding up a bill
19. 19.🔍 Which is the odd one out? (a) tapping a button (b) speaking a command (c) taking a photo (d) a result on screen
20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // 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 4 (b) line 2 (c) line 3 (d) line 1
21. 21.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
22. 22.⚙️ 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
23. 23.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
24. 24.Which of these is an output? (a) a buzz (vibration) (b) speaking a command (c) checking a password (d) adding up a bill
25. 25.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 1 (b) line 4 (c) line 2 (d) line 3
27. 27.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
28. 28.🔍 Which is the odd one out? (a) typing your age (b) a buzz (vibration) (c) taking a photo (d) tapping a button
29. 29.True or false: speaking a command is an output. (a) False (b) True
30. 30.Which of these is an input? (a) taking a photo (b) a beep sound (c) checking a password (d) adding up a bill
31. 31.🔍 Which is the odd one out? (a) working out a tip (b) a buzz (vibration) (c) a pop-up message (d) a result on screen
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // 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 2 (c) line 4 (d) line 3
33. 33.⚙️ What number does this app show?
    let bill = 156; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
34. 34.🔍 Which is the odd one out? (a) typing your age (b) speaking a command (c) adding up a bill (d) taking a photo
35. 35.⚙️ 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 3 (c) line 1 (d) line 2
36. 36.True or false: a result on screen is an output. (a) False (b) True
37. 37.⚙️ What number does this app show?
    let bill = 125; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 590; // 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 4 (b) line 1 (c) line 2 (d) line 3
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 94; // 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 4 (b) line 1 (c) line 3 (d) line 2
40. 40.⚙️ 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 2 (b) line 1 (c) line 3

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