Float to String format specifier

Question

I have some float values I want to convert to a string  I want to keep the formatting the same when converting  i e  999 0000 float  -  999 0000 String    My problem is when the values contain an arbitrary number of zeroes after the decimal point  as in the previous example  they are stripped away when converting to a string  so the result I actually end up with is 999     I looked at the format specifiers for the toString   method on MSDN  the RoundTrip   R   specifier looks like it will produce what I want  but it is only supported for Single  Double and BigInt variables   Is there a format specifier like this for float variables    Or would it be easier to just convert the values to doubles   UPDATE  Just for clarity  the reason why I want to keep the trailing zeroes is because I m doing a comparison of decimal places  i e  I m comparing the number of digits after the decimal place between two values   So for example  1 00 and 1 00000 have a different number of digits after the decimal point   I know it s a strange request  it s for work and the requirement is coming from on high   UPDATE 2-3-11   I was thinking about this too hard  I m reading the numbers from a txt file and then parsing them as floats  I m going to modify the program to check whether the string values are decimals or whole numbers   Sorry for wasting your time  although this was very insightful

User · Answer

In C   float  is an alias for System Single  a bit like intis an alias for System Int32

User · Answer

Firstly  as Etienne says  float in C  is Single  It is just the C  keyword for that data type   So you can definitely do this   float f   13 5f  string s   f ToString  R      Secondly  you have referred a couple of times to the number s  format   numbers don t have formats  they only have values  Strings have formats  Which makes me wonder  what is this thing you have that has a format but is not a string  The closest thing I can think of would be decimal  which does maintain its own precision  however  calling simply decimal ToString should have the effect you want in that case   How about including some example code so we can see exactly what you re doing  and why it isn t achieving what you want

User · Answer

You can pass a format string to the ToString method  like so   ToString  N4       4 decimal points Number   If you want to see more modifiers  take a look at MSDN - Standard Numeric Format Strings

User · Answer

Use ToString   with this format   12345 678901 ToString  0 0000       outputs 12345 6789 12345 0 ToString  0 0000       outputs 12345 0000   Put as much zero as necessary at the end of the format

[c#] Float to String format specifier

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