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for (var i = 0; i < count; i++) { } == for (var i = 0; i < count; i++) { }. What is this notation and why use it? [closed]

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Ran into the notation:
for (var i = 0; i < count; i++) { }
on this tutorial. I gather it is equivalent to:
for(var i = 0; i < count; i++) { }
What is this notation? Why use it? Does it perform better?

It's an HTML parsing error. < is supposed to show up as <. You're right - it's supposed to be i < count.

C# - Cannot implicitly convert type `int' to `int[][]' - CodeFights [closed]

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When attempting to use the following bit of code to answer a question Box Blur on the website CodeFights.com, I receive the following message which has me stumped:
file.cs on line 2: error CS0029: Cannot implicitly convert type `int' to `int[][]'
I'm confident that this is something simple that I'm missing but, my searching for an answer to this has not returned any success.
Any ideas as to what simple mistake I am committing?
int[][] boxBlur(int[][] matrix) {
int[][] result = new int[matrix.Length-2][matrix[0].Length-2];
for (int i =1; i < matrix.Length-1; i++)
for (int j = 1; j < matrix[0].Length-1; j++)
{
int sum=0;
for(int k=i-1; k<=i+1; k++)
{
for(int m=j-1;m<=j+1;m++)
{
sum+=matrix[k][m];
}
}
result[i-1][j-1]=sum/9;
}
return result;
}

Wrong call array. Try this(or something like):
int[][] result = new int[matrix.Length - 2][];
for(int i=0; i< matrix.Length - 2; i++)
{
result[i] = new int[matrix[0].Length - 2];
}

int[][] is an array of arrays. You can't initialize the size of the arrays within it when you're initializing it.
If you want a two-dimensional array, use int[,].

Why does for-loop show nothing in cmd [closed]

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Closed 6 years ago.
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I have problem with for loop in C#.
I have the following code, in main method:
using System;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
for(int i=0;i>20;i++)
{
if(i%2==0)
{
Console.WriteLine("{0},", i);
}
}
Console.ReadLine();
}
}
}
The for loop does not execute. Why?

Change condition, > to <:
...
for (int i = 0; i < 20; i++) // i < 20, not i > 20
...
In your original code you assign int i = 0 then check i > 20 get false and do not enter the loop at all

The following statement in your code:
for (int i = 0; i > 20; i++)
First assigns 0 to i then evaluates the condition i > 20 which is wrong, so the for block can not be executed.

Other people have pointed out the fact that the test should actually be "i < 20" rather than "i > 20) but just to make one other point: if all you're trying to do is write out all the even numbers, you can actually increment "i" by 2 every time - that way you never have to test to see if it's even (just write "i += 2" instead of "i++").

how to separate numbers by asterisks c# [closed]

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I don't understand how to do this im new to programming but im sure its simple. help the code I have so far is:
I need the asterisks to be separating the numbers
for (int i = 0; i < 101; i++)
Console.WriteLine(i);
Console.WriteLine("********");
but the asterisks is only showing at the bottom

You should put the body of the loop into a scope:
for (int i = 0; i < 101; i++)
{
Console.WriteLine(i);
Console.WriteLine("********");
}
Otherwise only the following next command is interpreted as the body of the loop, equivalent to this:
for (int i = 0; i < 101; i++)
{
Console.WriteLine(i);
}
Console.WriteLine("********");

The way you have it is only doing the for loop on the first line. You need to put both lines into a 'block' using curly braces:
for (int i = 0; i < 101; i++)
{
Console.WriteLine(i);
Console.WriteLine("********");
}

Replace string value in C#? [closed]

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I am new to C#, and need a little help, i know in PHP that i can to something like this
$SelectedEvent="event selected";
if (i > 0)
{
$SelectedEvent = "event";
}
It replace a string easy, but in c# that is not working ok, here is example code i have that is not working
string SelectedEvent = "event selected";
if (i > 0)
{
SelectedEvent = "event";
}
This is not working like in PHP, i can not override the varible?
Here is my example code
EDITED
for (int i = 0; i < Model.Items.Count; i++)
{
string SelectedEvent = "event selected";
if (i > 1)
{
string SelectedEvent = "event";
}
}

You should not redeclare the variable twice but only modify its value:
for (int i = 0; i < Model.Items.Count; i++)
{
string SelectedEvent = "event selected";
if (i > 1)
{
SelectedEvent = "event";
}
// here you can use the SelectedEventVariable
// its value will be "event selected" on the first and second
// iterations and "event" on subsequent
}