App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 488 · 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 bill = 132; // typed by the user
   line 2: let friends = 3; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 4 (b) line 2 (c) line 1 (d) line 3
2. 2.⚙️ What number does this app show?
   let price = 25; // typed by the user
   let qty = 4; // typed by the user
   let total = price * qty;
   show(total);
3. 3.⚙️ What number does this app show?
   let price = 75; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
4. 4.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
5. 5.🔍 Which is the odd one out? (a) adding up a bill (b) speaking a command (c) typing your age (d) taking a photo
6. 6.True or false: a buzz (vibration) is an output. (a) False (b) True
7. 7.⚙️ What number does this app show?
   let price = 260; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
8. 8.⚙️ 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
9. 9.⚙️ What number does this app show?
   let bill = 200; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
10. 10.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 138; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 2 (c) line 4 (d) line 3
12. 12.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) sorting the scores (d) a beep sound
13. 13.Which of these is processing? (a) a pop-up message (b) tapping a button (c) speaking a command (d) working out a tip
14. 14.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) taking a photo
15. 15.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 110; // 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 2 (d) line 4
17. 17.Which of these is an input? (a) a pop-up message (b) a result on screen (c) working out a tip (d) tapping a button
18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 2 (d) line 4
19. 19.True or false: adding up a bill is processing. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) sorting the scores (d) typing your age
21. 21.Which of these is an output? (a) checking a password (b) a beep sound (c) speaking a command (d) typing your age
22. 22.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
23. 23.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) tapping a button
24. 24.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
25. 25.⚙️ What number does this app show?
    let bill = 244; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
26. 26.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) output (c) processing
27. 27.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) tapping a button (d) typing your age
28. 28.Which of these is an input? (a) working out a tip (b) a result on screen (c) taking a photo (d) checking a password
29. 29.True or false: taking a photo is processing. (a) True (b) False
30. 30.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) processing (c) input
31. 31.⚙️ In an app, is a beep sound an input, processing or an output? (a) input (b) processing (c) output
32. 32.True or false: a pop-up message is an output. (a) True (b) False
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 82; // 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 3 (c) line 1 (d) line 2
34. 34.True or false: sorting the scores is processing. (a) True (b) False
35. 35.⚙️ 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 3 (b) line 2 (c) line 1
36. 36.Which of these is processing? (a) typing your age (b) a result on screen (c) a pop-up message (d) adding up a bill
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 400; // 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 3 (b) line 2 (c) line 1 (d) line 4
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 174; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 3 (c) line 2 (d) line 1
39. 39.Which of these is an input? (a) sorting the scores (b) typing your age (c) a result on screen (d) adding up a bill
40. 40.⚙️ What number does this app show?
    let price = 460; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);

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