App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 632 · 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.True or false: speaking a command is processing. (a) True (b) False
2. 2.⚙️ What number does this app show?
   let price = 380; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.Which of these is an input? (a) typing your age (b) a pop-up message (c) a result on screen (d) a buzz (vibration)
4. 4.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let km = 6; // typed by the user
   line 2: let metres = km * 1000;
   line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
6. 6.Which of these is processing? (a) working out a tip (b) a buzz (vibration) (c) tapping a button (d) speaking a command
7. 7.⚙️ What number does this app show?
   let price = 40; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
8. 8.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 150; // 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 3 (c) line 1 (d) line 4
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 30; // 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 1 (b) line 4 (c) line 2 (d) line 3
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 1 (b) line 3 (c) line 4 (d) line 2
11. 11.True or false: working out a tip is processing. (a) False (b) True
12. 12.⚙️ What number does this app show?
    let price = 170; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
13. 13.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
14. 14.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
15. 15.Which of these is processing? (a) tapping a button (b) adding up a bill (c) a buzz (vibration) (d) a beep sound
16. 16.⚙️ 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);
17. 17.True or false: typing your age is an input. (a) False (b) True
18. 18.Which of these is an input? (a) a pop-up message (b) checking a password (c) working out a tip (d) taking a photo
19. 19.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) a pop-up message (d) a beep sound
20. 20.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
21. 21.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.🔍 Which is the odd one out? (a) a result on screen (b) speaking a command (c) typing your age (d) tapping a button
23. 23.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
24. 24.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) working out a tip (d) typing your age
25. 25.True or false: a pop-up message is an output. (a) True (b) False
26. 26.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.🔍 Which is the odd one out? (a) a pop-up message (b) a buzz (vibration) (c) a result on screen (d) adding up a bill
28. 28.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) a pop-up message (d) typing your age
29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 1 (c) line 3 (d) line 4
30. 30.True or false: sorting the scores is processing. (a) False (b) True
31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
32. 32.Which of these is an output? (a) typing your age (b) a result on screen (c) taking a photo (d) checking a password
33. 33.Which of these is an input? (a) a beep sound (b) sorting the scores (c) a buzz (vibration) (d) tapping a button
34. 34.⚙️ In an app, is checking a password an input, processing or an output? (a) output (b) input (c) processing
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 390; // 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
36. 36.True or false: a beep sound is processing. (a) False (b) True
37. 37.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) a buzz (vibration) (d) typing your age
39. 39.⚙️ 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 4 (b) line 3 (c) line 2 (d) line 1
40. 40.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input

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