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How to remove count of specific byte in array C#? [closed]

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I want to remove bytes from an array, I don't want to remove all bytes 0x6f I just want to remove two only of them. This is my code:
string msg = "gooooooal";
byte[] oldArray = Encoding.GetEncoding(1256).GetBytes(msg);
byte[] newArray = oldArray.Where(b => b != 0x6f).ToArray();

You can first find the position and then remove them
byte[] oldArray = Encoding.GetEncoding(1256).GetBytes(msg);
int howManyToRemove = 2; //How many items to remove
var positions = new List<int>();
int lastPos = -1;
for (int i = 0; i < howManyToRemove; i++)
{
var position = Array.IndexOf(oldArray, (byte)0x6f,lastPos+1);
if (position == -1)
{
break;
}
lastPos=position;
positions.Add(position);
}
byte[] newArray = oldArray.Where((val, idx) => !positions.Contains(idx)).ToArray();

If I understood your problem then if want to delete two occurrences of the letter o from your string because the 0x6f ASCII value is 111 which is the letter o.
and for that, you are making the solution very complex.
if can simply do like this.
string s = "gooooooal";
string output = removeChar(s, 'o'); //output will be gooool
static string removeChar(string s,
char ch)
{
int count = 2;
for (int i = 0; i < s.Length; i++)
{
// If ch is found
if (s[i] == ch && count > 0)
{
s = s.Substring(0, i) +
s.Substring(i + 1);
count--;
}
}
return s;
}

How to make only chosen characters uppercase in C# [closed]

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I want to make every other letter uppercase, how do I do that?
Code:
String a = ("aábdeéðfghiíjklmnoóprstuúvxyýþæö");
for (int i=0; i < a.Length; i++)
{
Console.Write(a.ToUpper()[i]+ ",");
}

Using Linq:
string a = "aábdeéðfghiíjklmnoóprstuúvxyýþæö";
var converted =
new string(a.Select((ch, i) => ((i % 2) == 0) ? ch : Char.ToUpper(ch)).ToArray());
Console.WriteLine(converted);

Increment your loop by 2.
Example:
String a = ("aábdeéðfghiíjklmnoóprstuúvxyýþæö");
for (int i=0; i<a.Length; i+=2)
Console.Write(a.ToUpper()[i]+ ",");
For every even alphabet start loop from 0 and for odd start from 1.

Linq answer is very good and has the advantage to be one liner, but a normal loop here is twice faster than the Linq solution
char[] a = "aábdeéðfghiíjklmnoóprstuúvxyýþæö".ToCharArray();
for (int i = 0; i < a.Length; i++)
{
if (i % 2 != 0)
{
a[i] = Char.ToUpper(a[i]);
}
}
string result = new string(a);

Using LINQ to go through each char in the string. If it is divisible by 2 then that means its every other letter. So make that upper case, if not divisible by 2 then leave it as it is. Rejoin all the chars together in an array then convert that back into a string.
String a = ("aábdeéðfghiíjklmnoóprstuúvxyýþæö");
var convertedString = new string(a
.Select((c, i) => (i + 1) % 2 == 0 ? Char.ToUpper(c) : c)
.ToArray());

String a = ("aábdeéðfghiíjklmnoóprstuúvxyýþæö");
for (int i=0; i<a.Length; i++)
{
if (i % 2 == 0)
{
a = a.Substring(0, i) + a.Substring(i, 1).ToUpper() + a.Substring(i);
}
}
The % symbol is modulo, in this context if the index if divisible by 2 make the symbol upper case.
EDIT: as correctly pointed out, string are immutable, I've edited appropriately. This most likely isn't the most efficient way of doing this, I'd recommend using LINQ for a more efficient algorithm

You can use Linq.
string oldString = "aábdeéðfghiíjklmnoóprstuúvxyýþæö";
string alternatedString = string.Concat(
oldString.ToLower().Select((character, index) => index % 2 == 0 ? character : char.ToUpper(character)));
Output: aÁbDeÉðFgHiÍjKlMnOóPrStUúVxYýÞæÖ
Or
string oldString = "aábdeéðfghiíjklmnoóprstuúvxyýþæö";
StringBuilder alternatedString = new StringBuilder();
for(int index=0; index<oldString.Length; index++)
{
if(index % 2 == 0)
alternatedString.Append(oldString[index].ToString().ToLower());
else
alternatedString.Append(oldString[index].ToString().ToUpper());
}
Output: aÁbDeÉðFgHiÍjKlMnOóPrStUúVxYýÞæÖ

Change from iterative to recursive method [closed]

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int arraySum (int [] a, int n)
{
int sum = 0;
n = a.size();
for (int i = 1; i < n; i++)
sum += a[i];
return sum;
}
I want to convert this code from iterative to recursive.

C# Version:
int arraySum ( int [] a, int sum = 0, int i = 0 ) /*i = 0, technically means this code is logically different from yours, however it will count every element and is just a default :)*/
{
if( i < a.Length )
return arraySum( a, sum + a[i], ++i );
return sum;
}

You need:
1- Recursive definition like: sum(n) = n + sum(n-1)
2- You need to specify where should you stop so the recursion does not last forever.
for example: if (n == 0) return 0;
based on this you can code at any language.
C++ Example:
int arraySum (int a[], int n)
{
if(n==1)
return a[n-1];
else
return a[n-1] + arraySum (a, n-1);
}

How to Zip two numbers using c# [closed]

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string A = "1234"
string B = "567890"
I want to zip the numbers. Out put should display as "1526374890"
what is the best way to achieve this using C# code.

You can do that with the following code. It does not make any assumptions about which string is longer.
string A = "1234";
string B = "567890";
char[] chars = new char[A.Length + B.Length];
int charsIndex = 0;
for (int i = 0; i < A.Length || i < B.Length; i++)
{
if(i < A.Length)
chars[charsIndex++] = A[i];
if(i < B.Length)
chars[charsIndex++] = B[i];
}
string result = new string(chars);
Console.WriteLine(result);

Taking average value every 2 seconds [closed]

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i have a problem with arrays or something missed in these text..
my program works every 500ms and i want to read first 4 double values and take average of these values and then get next 4 double values and so on... i write something about this and can you pls look on this??
if (u_dcbus_pv_act[i] > 0 && i != 0)
{
u_dcbus_pv = u_dcbus_pv_act[i];
p_dcbus_pv = p_dcbus_pv_act[i];
}
if (i >= 3)
{
for (int j = 0; j < 4; j++)
{
total_u += u_dcbus_pv;
total_p += p_dcbus_pv;
}
average_u = total_u / 4;
average_p = total_p / 4;
u_dcbus_target = average_u;
p_dcbus_pv_avg = average_p;
}

from what I understand of your description, I would do it something like this:
/* add current samples to totals */
total_u += u_dcbus_pv_act[i];
total_p += p_dcbus_pv_act[i];
/* every fourth tick, calc average and reset totals */
if (i % 4 == 0)
{
average_u = total_u / 4;
average_p = total_p / 4;
total_u = 0;
total_p = 0;
}
u_dcbus_target = average_u;
p_dcbus_pv_avg = average_p;
i++;