How do pattern codes work?

Question

Hello guys. As I'm a beginner in programming, I'm having a hard time understanding the logic of code that shows a pattern on the console. I picked up a simple one to study:
http://www.c-sharpcorner.com/UploadFile/2072a9/triangle-patterns-in-C-Sharp/
It seems to me to be extremely simple and so it is difficult to find a detailed explanation. Even beginner-oriented tutorials say nothing about.

And sorry for my english. :x

Answer 1

int val = 5;
         int i, j, k ;
         for (i = 1; i <= val; i++)
         {
            for (j = 1; j <= i; j++)
            {
               Console.Write("");
            }
            for (k = 1; k <= i; k++)
            {
               Console.Write("*");
            }
            Console.WriteLine("");
         }

Here there r 2 for loops inside 1 for loop
the 1st for loop will run 5 times for values 1 to 5...
basically 2nd for loop does nothing... u can remove it if u want
third for loops print *
--> 1st for loop i = 1, 3rd for loop executes for value of i = 1 3rd for loop runs 1 time as k = 1 & k<=1 so only 1 star is printed
-->Console.WriteLine is there to move cursor to next line after printing star* ...
-->again it goes to 1st for loop by getting i incremented now i = 2 ....
so again the loops inside are executed...
this time the for loop having k variable will run twice... and 2 stars * will be printed...

https://code.sololearn.com/c6i5RF43Zl5a/?ref=app

Answer 2

int val = 5;
         int i, j, k ;
         for (i = 1; i <= val; i++)
         {   
            for (k = 1; k <= i; k++)
            {
               Console.Write("*");
            }
            Console.WriteLine("");
         }
this will output the same
Console.WriteLine("") plays a very important role... U should use it wisely..

Answer 3

Haha, thank you. :>
Well, my problem is not exactly with loops, but with that kind of loop specifically. What, exactly, is each thing doing? As in this example, we have four variables. I know that one represents the boundary of the pattern lines while the others draw the characters, but I can not identify where and how this is being done. Whenever I try to do something like this without reference codes I end up drawing a single character per line even using Console.Write () ;.

Answer 4

Thank you so much, 🌛DT🌜. Now I understand, now it all makes sense, and so on. And thank you too, Alex. o/

Answer 5

*writes question in good understandable english*
*apologizes for bad english*
Your english is fine :P
Now your question: Your problems are the for loops in general or nested loops like in these examples?