App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 998 · 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) speaking a command (b) typing your age (c) a beep sound (d) taking a photo
2. 2.🔍 Which is the odd one out? (a) speaking a command (b) a pop-up message (c) tapping a button (d) taking a photo
3. 3.🔍 Which is the odd one out? (a) a pop-up message (b) speaking a command (c) a beep sound (d) a buzz (vibration)
4. 4.⚙️ What number does this app show?
   let km = 13; // typed by the user
   let metres = km * 1000;
   show(metres);
5. 5.⚙️ What number does this app show?
   let price = 430; // typed by the user
   let off = 10; // typed by the user
   let pay = price - off;
   show(pay);
6. 6.Which of these is an output? (a) working out a tip (b) a result on screen (c) typing your age (d) speaking a command
7. 7.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
8. 8.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
9. 9.True or false: a pop-up message is an output. (a) True (b) False
10. 10.Which of these is an input? (a) taking a photo (b) a beep sound (c) a result on screen (d) a pop-up message
11. 11.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) speaking a command (d) typing your age
12. 12.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
13. 13.Which of these is processing? (a) sorting the scores (b) typing your age (c) a beep sound (d) taking a photo
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 260; // typed by the user
    line 2: let friends = 4; // 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
15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // 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 1 (b) line 3 (c) line 4 (d) line 2
16. 16.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a buzz (vibration) (d) typing your age
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // typed by the user
    line 2: let qty = 5; // 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
18. 18.🔍 Which is the odd one out? (a) adding up a bill (b) typing your age (c) tapping a button (d) taking a photo
19. 19.⚙️ 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 4 (b) line 2 (c) line 1 (d) line 3
20. 20.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
21. 21.True or false: a buzz (vibration) is an input. (a) False (b) True
22. 22.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
23. 23.⚙️ What number does this app show?
    let price = 290; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
24. 24.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
25. 25.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
26. 26.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 1 (c) line 2 (d) line 3
28. 28.True or false: a beep sound is an input. (a) False (b) True
29. 29.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
30. 30.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) working out a tip
31. 31.⚙️ What number does this app show?
    let bill = 64; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
32. 32.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) a beep sound (d) sorting the scores
33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 1 (c) line 2 (d) line 3
34. 34.🔍 Which is the odd one out? (a) checking a password (b) adding up a bill (c) sorting the scores (d) tapping a button
35. 35.⚙️ 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 3 (c) line 1 (d) line 4
36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 1 (b) line 3 (c) line 2 (d) line 4
37. 37.Which of these is an input? (a) sorting the scores (b) a pop-up message (c) checking a password (d) tapping a button
38. 38.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 150; // 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 1 (b) line 2 (c) line 4 (d) line 3
40. 40.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);

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