What is an Array? (C# vs Python)
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- Опубликовано: 12 сен 2024
- To keep a bunch of a datatype in a container = Array
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The first element is usually 0 because it denotes the offset from the start of the array. So by accessing item 1, you are offsetting one value away from the start of the array - which is actually the 2nd element in the array.
In languages that deal more with data science, such as R and MATLAB, the start of the array is usually 1.
If you're wanting a more Zarglar explanation, when computers were still young, the memory of the program was largely unmanaged. Think of it like a big book with numbered pages. You can put whatever you want on whatever page. If you wanted to set up an array, you had to designate memory for it, so in a book you can say that pages 15-18 will have an array of length 4 on there. When you type the beginning of your array variable, you would be given the address (or page number) for the first element in the array - which is page 15. To access it you would type array[0], since you are going to the array address and then moving forward 0 items. If you wanted the third item you would go to array[2] which would take you to page 15, then flip forward two pages to page 17 which is the third element in your array.
Now, the reason this is so helpful is if we change the size of our elements, so for example, we now have pictures on the pages, and each picture takes up 2 pages. Well, we just initialise the array to look at elements that are two pages long, so when it comes time to flip to the right element in the array, we know to skip 2 pages at a time, rather than one page at a time.
This helps us because it means we don't need to think of WHERE we're storing things in memory anymore, and think more about the data as a managed list for us. In the olden days, they would have had to remember that they had to flip forward 2 pages for certain elements, and flip forward 1 page for others. That could lead to all sorts of sticky situations if you're not careful.
Love this analogy! It explains (or at least gives a mental model for) he reasons for 0-based indexing, AND how indexing works under the covers, nicely. And yeah, you could have things that take 4 or 8 or however many pages, too. :)
Your videos got me into programming, python and all the cool stuff you do. You're awesome man!
Great video! Few things I want to note though (I am a java developer so I'm sorry if I made any mistakes as theses aren't my main focuses.)
1) you can initialize a c# array with values: *int[] array = new int[2] {100,100};*
2) you should've mentioned for each loops (the type of for loops that go for every element in this array or list). in that case in c# you can do *int[] array = new int[2];* and then *for(int i : array) i = 100;* - these two points make it easy to set up c# arrays. I think this is an important point as it makes C# easier to use and python have less of a benefit.
3) although it is out of the scope of the video I do think you should have talked a tiny bit more about how python has a list and not an array, and c# has arrays and lists. You mentioned the dynamic flexibility using append with python however that attribute goes towards lists and if you want you can do that in c# aswell. I am not too sure about the syntax for c# lists but I assume you can also initialise values into them just like arrays. Also using append is a slower operation than just assigning values and I think you should have shown how to modify or get an existing value in python, (rather than the entire list which is what you showed). Also im not sure if pythons default list is an array list or a linked list or some other form of list but certain types of lists (linked lists are ones I know for sure, I know array lists aren't for sure, other than that i'm not sure) don't get at constant time (meaning that the more elements in the array or the higher the index value the more time it will take, constant time means it will take a fixed amount of time like in arrays).
Great video nonetheless I just thought I'd point a few things out incase anybody reading the comments wants to know.
for(int i: array) is java syntax not c#
Very helpful, thank you.
10:02 perfect for getting that BATTLE ROYALE!
Nice tutorial of Python for people who know some basic things of C#/C/C++. Look forward of your next tutorial.
Please continue doing such great work!
The likes and views will come slowly as these are tutorials about the basics.
If you don't have a playlist for all these videos I suggest you make one with a catchy title to attract more people from searches.
Can’t you use uniform initialization? Or is it only c++?
So you deleted the variables/arrays whatever, but it’s saved right? Did you have to delete it ?
Excellent however... the video doesn't show how in python you would print the HP of one particular player like you would do in C# Console.WriteLine(HP[3]) for example. (just wondering as a complete noob)
you don't need the " ; " for the for loop?
StarBattle08 no
What you mentionned in python are actually lists not arrays, to use arrays in python take in consideration Numpy library
*This code will give you all of the parts of an array from the beginning to the end:*
_int[] hp = new int[100];_
_// Print the HP of all 100 players_
*_for_*_ (int i = 0; i < hp.Length; i++)_
_{_
_hp[i] = 100;_
_Console.WriteLine($"{i}: {hp[i]}");_
_}_
_Console.ReadKey();_
*This python code does pretty much the same thing:*
_hp = [100]*100_
*_for_*_ i in range(hp.__len__()):_
_ print(f"{i}: {hp[i]}")_
output should be:
0: 100
1: 100
2: 100
3: 100
4: 100
5: 100
6: 100
7: 100
8: 100
9: 100
10: 100
11: 100
12: 100
13: 100
14: 100
15: 100
16: 100
17: 100
18: 100
19: 100
20: 100
21: 100
22: 100
23: 100
24: 100
25: 100
26: 100
27: 100
28: 100
29: 100
30: 100
31: 100
32: 100
33: 100
34: 100
35: 100
36: 100
37: 100
38: 100
39: 100
40: 100
41: 100
42: 100
43: 100
44: 100
45: 100
46: 100
47: 100
48: 100
49: 100
50: 100
51: 100
52: 100
53: 100
54: 100
55: 100
56: 100
57: 100
58: 100
59: 100
60: 100
61: 100
62: 100
63: 100
64: 100
65: 100
66: 100
67: 100
68: 100
69: 100
70: 100
71: 100
72: 100
73: 100
74: 100
75: 100
76: 100
77: 100
78: 100
79: 100
80: 100
81: 100
82: 100
83: 100
84: 100
85: 100
86: 100
87: 100
88: 100
89: 100
90: 100
91: 100
92: 100
93: 100
94: 100
95: 100
96: 100
97: 100
98: 100
99: 100
Cool stuff, mate. For clarity, adding "player" and "HP" to the string is a plus.
Console.WriteLine($"Player {i}: HP: {hp[i]}");
I can't get code runner to work. How did you
Control + F5 or the run button at the top
man i'm glad c#'s for loop is basically identical to javascript's.
for loops of python are similar to lua's imo
but c# has List
Lets see if ur big brain if you think Array is the most important in data type then explain why