App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 857 · 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 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 3 (c) line 2
2. 2.⚙️ What number does this app show?
   let km = 4; // typed by the user
   let metres = km * 1000;
   show(metres);
3. 3.True or false: typing your age is an input. (a) False (b) True
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 55; // 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 1 (b) line 3 (c) line 2 (d) line 4
5. 5.Which of these is an output? (a) a buzz (vibration) (b) tapping a button (c) typing your age (d) checking a password
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 460; // typed by the user
   line 2: let off = 10; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 3 (b) line 2 (c) line 4 (d) line 1
7. 7.⚙️ What number does this app show?
   let price = 110; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
9. 9.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) sorting the scores (d) a buzz (vibration)
10. 10.Which of these is an input? (a) sorting the scores (b) adding up a bill (c) checking a password (d) taking a photo
11. 11.Which of these is an input? (a) speaking a command (b) checking a password (c) a result on screen (d) adding up a bill
12. 12.⚙️ 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 2 (b) line 3 (c) line 1
13. 13.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
14. 14.True or false: a result on screen is an output. (a) False (b) True
15. 15.Which of these is an output? (a) tapping a button (b) checking a password (c) working out a tip (d) a beep sound
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 130; // 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 4 (c) line 1 (d) line 2
17. 17.Which of these is an output? (a) working out a tip (b) a result on screen (c) speaking a command (d) checking a password
18. 18.True or false: a beep sound is processing. (a) False (b) True
19. 19.True or false: adding up a bill is an output. (a) False (b) True
20. 20.⚙️ What number does this app show?
    let price = 220; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
21. 21.🔍 Which is the odd one out? (a) adding up a bill (b) taking a photo (c) working out a tip (d) sorting the scores
22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
23. 23.⚙️ 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);
24. 24.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) output (c) input
25. 25.⚙️ What number does this app show?
    let km = 13; // typed by the user
    let metres = km * 1000;
    show(metres);
26. 26.True or false: speaking a command is an input. (a) False (b) True
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 3 (b) line 4 (c) line 2 (d) line 1
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
29. 29.🔍 Which is the odd one out? (a) adding up a bill (b) speaking a command (c) taking a photo (d) typing your age
30. 30.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) a buzz (vibration) (d) working out a tip
31. 31.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) tapping a button (d) working out a tip
32. 32.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
33. 33.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
34. 34.True or false: working out a tip is processing. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) a beep sound (d) working out a tip
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 200; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 1 (c) line 2 (d) line 4
37. 37.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
38. 38.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 140; // 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 3 (d) line 4
40. 40.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);

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