App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 152 · 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 is the odd one out? (a) working out a tip (b) adding up a bill (c) typing your age (d) sorting the scores
2. 2.⚙️ 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 1 (b) line 3 (c) line 2 (d) line 4
3. 3.⚙️ What number does this app show?
   let bill = 42; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 70; // 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 line does the processing (works out the answer)?
   line 1: let price = 190; // 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 4 (c) line 2 (d) line 1
6. 6.⚙️ What number does this app show?
   let bill = 78; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
7. 7.⚙️ What number does this app show?
   let price = 90; // typed by the user
   let qty = 6; // typed by the user
   let total = price * qty;
   show(total);
8. 8.🔍 Which is the odd one out? (a) adding up a bill (b) speaking a command (c) sorting the scores (d) checking a password
9. 9.True or false: taking a photo is processing. (a) True (b) False
10. 10.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) checking a password (d) sorting the scores
12. 12.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 33; // 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 2 (b) line 3 (c) line 4 (d) line 1
14. 14.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
15. 15.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
16. 16.Which of these is an input? (a) taking a photo (b) working out a tip (c) checking a password (d) a beep sound
17. 17.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
18. 18.⚙️ What number does this app show?
    let km = 11; // typed by the user
    let metres = km * 1000;
    show(metres);
19. 19.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) processing (c) input
20. 20.🔍 Which is the odd one out? (a) tapping a button (b) sorting the scores (c) typing your age (d) taking a photo
21. 21.⚙️ 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 1 (b) line 2 (c) line 3
22. 22.Which of these is an input? (a) a result on screen (b) a buzz (vibration) (c) a beep sound (d) tapping a button
23. 23.True or false: a beep sound is an output. (a) False (b) True
24. 24.⚙️ What number does this app show?
    let bill = 38; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
25. 25.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) typing your age (d) speaking a command
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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
27. 27.Which of these is an output? (a) a pop-up message (b) speaking a command (c) taking a photo (d) checking a password
28. 28.True or false: speaking a command is an output. (a) False (b) True
29. 29.Which of these is an input? (a) speaking a command (b) adding up a bill (c) a pop-up message (d) a result on screen
30. 30.🔍 Which is the odd one out? (a) checking a password (b) typing your age (c) speaking a command (d) tapping a button
31. 31.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
32. 32.True or false: a buzz (vibration) is an input. (a) False (b) True
33. 33.Which of these is an input? (a) checking a password (b) adding up a bill (c) a buzz (vibration) (d) typing your age
34. 34.True or false: a pop-up message is an input. (a) False (b) True
35. 35.⚙️ What number does this app show?
    let bill = 96; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
36. 36.True or false: working out a tip is an output. (a) False (b) True
37. 37.⚙️ In an app, is checking a password 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 bill = 162; // 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 3 (b) line 1 (c) line 4 (d) line 2
39. 39.⚙️ What number does this app show?
    let bill = 72; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
40. 40.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);

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