Converting string to double in C

Question

I have a long string with double-type values separated by   -value1 value2 value3  etc  I splitted it to string table  Then  I want to convert every single element from this table to double type and I get an error  What is wrong with type-conversion here   string a    52 8725945 18 69872650000002 50 9028073 14 971600200000012 51 260062 15 5859949000000662452 23862099999999 19 372202799999250800000045 51 7808372 19 474096499999973    string   someArray   a Split new char             for  int i   0  i  lt  someArray Length  i          Console WriteLine someArray i       correct value     Convert ToDouble someArray i       error

User · Answer

Most people already tried to answer your questions.
If you are still debugging, have you thought about using:

Double.TryParse(String, Double);

This will help you in determining what is wrong in each of the string first before you do the actual parsing.
If you have a culture-related problem, you might consider using:

Double.TryParse(String, NumberStyles, IFormatProvider, Double);

This http://msdn.microsoft.com/en-us/library/system.double.tryparse.aspx has a really good example on how to use them.

If you need a long, Int64.TryParse is also available: http://msdn.microsoft.com/en-us/library/system.int64.tryparse.aspx

Hope that helps.

User · Answer

You can try this example out  A simple C  progaram to convert string to double  class Calculations   protected double length  protected double height  protected double width   public void get data     this length   Convert ToDouble Console ReadLine     this width    Convert ToDouble Console ReadLine     this height   Convert ToDouble Console ReadLine

User · Answer

In your string I see  15 5859949000000662452 23862099999999 which is not a double  it has two decimal points    Perhaps it s just a legitimate input error   You may also want to figure out if your last String will be empty  and account for that situation

User · Answer

Add a class as Public and use it very easily like convertToInt32      using System    using System Collections Generic    using System Linq    using System Web          lt summary gt        Summary description for Common        lt  summary gt    public static class Common          public static double ConvertToDouble string Value            if  Value    null               return 0                    else              double OutVal             double TryParse Value  out OutVal               if  double IsNaN OutVal     double IsInfinity OutVal                   return 0                          return OutVal                         Then Call The Function  double DirectExpense    Common ConvertToDouble dr  DrAmount   ToString

User · Answer

private double ConvertToDouble string s                char systemSeparator   Thread CurrentThread CurrentCulture NumberFormat CurrencyDecimalSeparator 0           double result   0          try                       if  s    null                  if   s Contains                           result   double Parse s  CultureInfo InvariantCulture                   else                     result   Convert ToDouble s Replace      systemSeparator ToString    Replace      systemSeparator ToString                        catch  Exception e                        try                               result   Convert ToDouble s                             catch                               try                                       result   Convert ToDouble s Replace           Replace           Replace                                               catch                       throw new Exception  Wrong string-to-double format                                                      return result          and successfully passed tests are           Debug Assert ConvertToDouble  1 000 007      1000007 00           Debug Assert ConvertToDouble  1 000 007 00      1000007 00           Debug Assert ConvertToDouble  1 000 07      1000 07           Debug Assert ConvertToDouble  1 000 007      1000007 00           Debug Assert ConvertToDouble  1 000 000 07      1000000 07           Debug Assert ConvertToDouble  1 007      1 007           Debug Assert ConvertToDouble  1 07      1 07           Debug Assert ConvertToDouble  1 007      1007 00           Debug Assert ConvertToDouble  1 000 007E-08      0 07           Debug Assert ConvertToDouble  1 000 007E-08      0 07

User · Answer

There are 3 problems   1  Incorrect decimal separator  Different cultures use different decimal separators  namely   and       If you replace   with   it should work as expected   Console WriteLine Convert ToDouble  52 8725945       You can parse your doubles using overloaded method which takes culture as a second parameter  In this case you can use InvariantCulture  What is the invariant culture  e g  using double Parse   double Parse  52 8725945   System Globalization CultureInfo InvariantCulture     You should also take a look at double TryParse  you can use it with many options and it is especially useful to check wheter or not your string is a valid double   2  You have an incorrect double  One of your values is incorrect  because it contains two dots   15 5859949000000662452 23862099999999  3  Your array has an empty value at the end  which is an incorrect double  You can use overloaded Split which removes empty values   string   someArray   a Split new char            StringSplitOptions RemoveEmptyEntries

[c#] Converting string to double in C#

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