Arrays in C-sharp

Anil Kumar

Hi.
i want below maintain output with the help of Array. what is the program for that?? i have use for loop but i am not getting such output please help me

*
***
*****
*******
*****
***
*

12 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sam Hobbs15y ago
Yes, char is initialized to 0. So I am sure there is a 1-line code for initializing the char items to spaces if it was important.
Vulpes15y ago
Sam,

A char[] is in fact initialized to null chars '\0' but it doesn't matter because Console.WriteLine() writes them to the console as though they were spaces :)

Frogleg,

LOL ;)
Frogleg15y ago
Stars, stars everywhere
Asterisk you take when you play with stars
Sam Hobbs15y ago
This is not the simplest, but I think it is an alternative that satisfies the requirements. I assume that a char is initialized to a space character.
char[] Stars = new char[7];
Stars[3] = '*';
for (int i = 0; i < 3; ++i)
{
Console.WriteLine(Stars);
Stars[2 - i] = '*';
Stars[4 + i] = '*';
}
for (int i = 2; i >= 0; --i)
{
Console.WriteLine(Stars);
Stars[2 - i] = ' ';
Stars[4 + i] = ' ';
}
Console.WriteLine(Stars);
Frogleg15y ago
Yep IE8
Vulpes15y ago
I've just looked at the HTML for the page and the problem is that your browser (IE perhaps?) is not inserting non-breaking spaces and so multiple spaces are being compressed to a single one when the page is rendered.

Mine on the other hand (Google Chrome) is inserting non-breaking spaces for the first two items and so no compression takes place.
Frogleg15y ago
Strange re
static string[] ast = new string[4] { " *", " ***", " *****", "*******" };
as it is Ok in the ide and I just pasted it fron there
Anyway Anil has two ways of doing it now
Vulpes15y ago
I've used it because both 'i' and 'j' can be negative but we need to provide symmetry whether they're positive or negative.

If you remove the Math.Abs, you'll find that it doesn't work correctly.
Anil Kumar15y ago
Hi vulpes,

why you have use Math.Abs function???
Vulpes15y ago
I suspect that Frogleg's browser may be condensing multiple spaces into a single space as his first line should, of course, be:

static string[] ast = new string[4] { " *", " ***", " *****", "*******" };

Although it's not what the OP asked for, there's also an easy way to do this without using an array:

class Program
{
static void Main()
{
for(int i = -3; i <= 3; i++)
{
for(int j = -3; j <= 3; j++) Console.Write((Math.Abs(i) + Math.Abs(j) <= 3) ? '*' : ' ');
Console.WriteLine();
}
}
}
Dorababu Meka15y ago
Frogleg simple and cool :)
Frogleg15y ago
One way

class Program
{
static string[] ast = new string[4] { " *", " ***", " *****", "*******" };
static void Main(string[] args)
{

for (int i = 0; i < 4; i++)
{
Console.WriteLine(ast[i]);
}

for (int ii = 2; ii >= 0; ii--)
{
Console.WriteLine(ast[ii]);
}

}
}