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Hi All,
Silly question but I need to convert a String I have read from a file to a floating point number i.e. "0.45" to 0.45. A method I have used in the past was to do a
string strValue = "0.45";
fltValue = strValue.ToDouble();

This gave a floating point number I seem to remember but it was BIG.
Is there a simple, quick means of getting a two digit number?
I have seen a ConvertTo.Decimal() and a ConvertTo.Double(), Just trying to do it right!

What I have tried:

Uncle Google, MSDN Docs, Adding the ToDouble() and the ConvertTo and tried to cast the value using the C methods
Max_Value = (float)StrMax_Value;
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Comments
Richard MacCutchan 26-Feb-24 6:00am    
There is no such thing as "digits" in floating point values*. That is only relevant when you display the number using one of the format patterns.

*Floats and doubles are stored in scientific format: sign:exponent:mantissa.

Quote:
This gave a floating point number I seem to remember but it was BIG.
What do you intend, with 'BIG'?
You know, double data size is 8 bytes (independently by the conversion method you're using).

What's wrong with Double.Parse Method (System) | Microsoft Learn[^] and Double.TryParse Method (System) | Microsoft Learn[^]?
 
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Comments
Maciej Los 26-Feb-24 11:14am    
5ed!
CPallini 27-Feb-24 2:12am    
Thank you!
glennPattonWork3 26-Feb-24 15:04pm    
I was a little rushed when I typed that, BIG meant 32 bytes with compiler that was used it was for a embedded system.
I believe the correct way would be like
C#
string strValue= "0.45"; 

if (string.IsNullOrEmpty(strValue))
{
  // Handle the case of null or empty string (e.g., return default value, throw exception)
  Console.WriteLine("String is null or empty.");
  return; // Or throw an exception
}

// Proceed with conversion only if the string is not null or empty
float floatValue;

if (!float.TryParse(strValue, out floatValue))
{
  // Handle the case of invalid format or raise Exception
  Console.WriteLine("Invalid number format.");
}

//Conversion successful, use floatValue


Ideally, you should have a Helper Class with helper functions like ConvertToFloat in which you embed the above logic to have a consistent output.
 
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v2
Comments
glennPattonWork3 26-Feb-24 6:37am    
Appears to work, thanks!

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