App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 939 · 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: typing your age is an input. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let price = 220; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.Which of these is an output? (a) taking a photo (b) a buzz (vibration) (c) working out a tip (d) sorting the scores
4. 4.True or false: taking a photo is an output. (a) False (b) True
5. 5.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 90; // 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
6. 6.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 230; // 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 3 (d) line 2
7. 7.⚙️ What number does this app show?
   let price = 140; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
9. 9.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) a pop-up message (d) speaking a command
10. 10.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
11. 11.True or false: a result on screen is an input. (a) True (b) False
12. 12.Which of these is an output? (a) a result on screen (b) typing your age (c) speaking a command (d) adding up a bill
13. 13.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 1 (c) line 2 (d) line 4
15. 15.⚙️ 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 1 (b) line 4 (c) line 2 (d) line 3
16. 16.🔍 Which is the odd one out? (a) typing your age (b) working out a tip (c) sorting the scores (d) adding up a bill
17. 17.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
18. 18.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) working out a tip
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 440; // 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 1 (c) line 3 (d) line 2
20. 20.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
21. 21.Which of these is an input? (a) a buzz (vibration) (b) working out a tip (c) a pop-up message (d) speaking a command
22. 22.True or false: a result on screen is an output. (a) True (b) False
23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 2 (c) line 1 (d) line 3
24. 24.True or false: adding up a bill is processing. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) sorting the scores (b) taking a photo (c) typing your age (d) tapping a button
26. 26.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) adding up a bill (d) a buzz (vibration)
27. 27.⚙️ 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);
28. 28.Which of these is an input? (a) working out a tip (b) tapping a button (c) checking a password (d) a pop-up message
29. 29.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
30. 30.🔍 Which is the odd one out? (a) checking a password (b) taking a photo (c) working out a tip (d) adding up a bill
31. 31.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 90; // 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 1 (b) line 3 (c) line 4 (d) line 2
33. 33.Which of these is processing? (a) a pop-up message (b) adding up a bill (c) speaking a command (d) taking a photo
34. 34.⚙️ 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 3 (b) line 1 (c) line 4 (d) line 2
35. 35.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
36. 36.⚙️ What number does this app show?
    let bill = 320; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
37. 37.⚙️ In an app, is sorting the scores an input, processing or an output? (a) input (b) processing (c) output
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 180; // 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 3 (b) line 4 (c) line 2 (d) line 1
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 330; // 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 2 (c) line 3 (d) line 1
40. 40.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);

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