AnsiString to number? conversion problems (using borland builder)

[Darketernal]

I am having a world of problems of what i thought to be rather simple.

Edit1->Text = "123401278034987120478102873401982734";

Now Edit1->Text is an AnsiString

and i would like to format this to a number value, so that i can say.

CSpinEdit1->Value = "123401278034987120478102873401982734"

In other words transferring the value from Edit1->Text to CpinEdit1->Value;

Integers won't work because the number is to big. So i tried going from String to Number like in this article
Converting numbers to strings and string - C++ Articles
http://www.cplusplus.com/articles/D9j2Nwbp/



But that won't work because its an Ansistring, how would i go about this conversion?

[Chervil]

As you correctly said, the value is too big for an integer. It really depends on what you are intending to do with the resulting number. There is no built-in type which can handle an integer with that many digits. One possibility is to use a type double, which will give an approximation.

    AnsiString a = "123401278034987120478102873401982734";
    double d  = a.ToDouble();

The variable d will have the value of about 1.23401278034987e+35 (using scientific notation).

If you really need the full precision you will need to use some external bignum library.

edit Sorry, I skipped past the CSpinEdit. I've not used that and am not familiar with it. It looks like what you are attempting to do is not possible with TCSpinEdit and a number as large as that. The problem is not in the conversion, but in the TCSpinEdit component itself, it isn't suitable for use with a number having that many digits as the TCSpinEdit->Value is a long int.

One other comment. It probably won't help here, but it's useful to know. To convert an AnsiString to an ordinary c-string, use the .c_str() member function. Example:

    AnsiString a =  "12348765";
    int x = atoi(a.c_str());