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How can I add two strings into an int in a foreach loop? [closed]

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I have this code that helps me getting information from texts files , the problem is that i cant get to add all the strings founds in the texts files into one int.
in the first Entrada.txt i have a 23 and in the second one i have 45.
How can i add those 2 numbers together?
foreach(var impressora in ListaImp)
{
var Entrada = File.ReadAllText(impressora + #"\Entrada.txt");
MessageBox.Show("Entrada : " + Entrada);
}
Output: 2345.
I want it to be 23 + 45 = 68

You can do this:
int sub = 0;
foreach(var impressora in ListaImp)
{
var Entrada = File.ReadAllText(impressora + #"\Entrada.txt");
sub += int.Parse(Entrada);
}
MessageBox.Show(sub.ToString());

c# split a string by nothing [closed]

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I want to split a string which is "00608436483" into every single number
minArray = hoursMin[1].Split('');
min = Convert.ToInt32(minArray[0]);
hoursMin[1] is 00608436483
I want that i got an array ->
array[0] = 0
array[1] = 0
array[2] = 6
array[3] = 0
array[4] = 8
...
for example

You can get each character from the string and convert that to a number:
string s = "1234";
IEnumerable<int> values = s.Select(c => c - '0' /* which is ASCII value 48 */);
What this code does:
It selects every character.
For each character, it converts the characters ASCII value to the integer representation of it.
It yields an enumerable you can iterate over.

Textbox value to array or list [closed]

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I enter the value in textbox:
1,2,3,4,5,6,7...
How to into to int array or list and show value display ???
And stop when a user enters the wrong consecutive 3 times or total error of 5

//textbox is your textbox controls' name
string[] content = textbox.Text.Split(',');
//use linq convert stringp[] to int[]
int[] nums = (from num in content
select int.Parse(num)).ToArray();

I don't understand the last part of your question (the bit about stopping when a user enters something wrong... I guess you'd have to define "wrong" in this context). Regardless, the following code should take values entered into a text box (let's call it txtNumbers) and put it in an array of ints.
string[] splitContent = txtNumbers.Text.Split(new char[] { ',' });
int[] nums = new int[splitContent.Length];
for (int i = 0; i < splitContent.Length; i++)
{
nums[i] = Int32.Parse(splitContent[i]);
}

Is it possible in c# to do math with file names that contain numbers? [closed]

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Is it possible in c# to do math with file names that contain numbers? (i.e. change
file name : "c:\123.img" to "c:\127.img"?

This should be enough to get you started:
var files = Directory.GetFiles(path);
foreach (var f in files)
{
var info = new FileInfo(f);
var name = info.Name.Split('.')[0];
var extension = info.Name.Split('.')[1];
int i;
if (int.TryParse(name, out i))
{
File.Move(info.FullName, string.Format(#"{0}\{1}.{2}", path, i + 5, extension));
}
}

Calculate molecular weight based on chemical formula [closed]

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I am trying to write a program which will calculate the molecular weight of a given molecule based on its chemical formula.
This code can split a molecular formula like "CH3OH" to an array {C H 3 O H} but from here, what would be a good way to use the split text to calculate the molecular weight?
string input = MoleculeTextbox.text;
string pattern = #"([0-9]?\d*|[A-Z][a-z]{0,2}?\d*)";
string[] sunstrings = Regex.Split(input,pattern);

First of all, you'd need to parse the string and turn "H3" into "HHH", etc. That might look something like this:
var x = "CH3OH".replace(/([a-z])([2-9])/gi, function(_,c,n) { return new Array(1+parseInt(n)).join(c); });
First group being the matched character, and second group being the number of repetitions.
You now have a string that looks like "CHHHOH". You can split that line into an array with one character at each index, .split(''), and map each value to its molecular mass. For that you need to define some sort of lookup table. I'm using reduce to take care of the mapping and the addition in one go:
var mass = { C: 12.011, H: 1.008, O: 15.999 };
var weight = x.split('').reduce(function(sum,element) { return sum + mass[element]; }, 0);