I have strings that look like "01", "02". Is there an easy way that I can change the string into a number, add 1 and then change it back to a string so that these strings now look like "02", "03" etc. I'm not really good at C# as I just started and I have not had to get values before.
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Do all your numbers have 0's in front or is that just an example?Zach Johnson– Zach Johnson2011-05-14 05:30:14 +00:00Commented May 14, 2011 at 5:30
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5 Answers
To get from a string to an integer, you can youse int.Parse():
int i = int.Parse("07");
To get back into a string with a specific format you can use string.Format():
strings = string.Format("{0:00}",7);
The latter should give "07" if I understand http://www.csharp-examples.net/string-format-int/ correctly.
7 Comments
Joel Lee
+1 This is correct. The "00" part of the format string indicates that you want 2 or more digits, padded left with 0 if needed to ensure 2 digits.
Khepri
+1 this with the caveat of a preference for using TryParse instead of straight parse.
phoog
Actually, if you are turning only one number into a string, it's slightly more efficient to call the ToString instance method.
Anders Abel
@phoog
ToString would format it as 7 not as 07 which was requested.phoog
@Anders Abel: not so. There is an overload that takes a string parameter (that is, 7.ToString("00") would return "07"). It requires both less typing and fewer instructions than calling string.Format.
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You can convert the string into a number using Convert.ToInt32(), add 1, and use ToString() to convert it back.
int number = Convert.ToInt32(originalString);
number += 1;
string newString = number.ToString();
Comments
Parse the integer
int i = int.Parse("07");
add to your integer
i = i + 1;
make a new string variable and assign it to the string value of that integer
string newstring = i.ToString();
1 Comment
Nick A.
Sorry missed the format part :P Read too fast! See response below :)
AddStringAndInt(string strNumber, int intNumber)
{
//TODO: Add error handling here
return string.Format("{0:00}", (int.TryParse(strNumber) + intNumber));
}
1 Comment
slugster
This function is garbage in its current form,
TryParse takes an out parameter which holds the parsed value. And the return value of the TryParse (which is a boolean) will be what is inserted in the string.Format.static string StringsADD(string s1, string s2)
{
int l1 = s1.Count();
int l2 = s2.Count();
int[] l3 = { l1, l2 };
int minlength = l3.Min();
int maxlength = l3.Max();
int komsu = 0;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < maxlength; i++)
{
Int32 e1 = Convert.ToInt32(s1.PadLeft(maxlength, '0').ElementAt(maxlength - 1 - i).ToString());
Int32 e2 = Convert.ToInt32(s2.PadLeft(maxlength, '0').ElementAt(maxlength - 1 - i).ToString());
Int32 sum = e1 + e2 + komsu;
if (sum >= 10)
{
sb.Append(sum - 10);
komsu = 1;
}
else
{
sb.Append(sum);
komsu = 0;
}
if (i == maxlength - 1 && komsu == 1)
{
sb.Append("1");
}
}
return new string(sb.ToString().Reverse().ToArray());
}
I needed to add huge numbers that are 1000 digit. The biggest number type in C# is double and it can only contain up to 39 digits. Here a code sample for adding very huge numbers treating them as strings.