Segfault when calling mpf_get_str

[Navid Roux]

Hello all,

I get a segmentation fault in my program when I call mpf_get_str().
I've found this mail in your archives:
http://gmplib.org/list-archives/gmp-discuss/2003-November/000888.html

So the error most likely comes from my code. It would be very unlikely that
GMP has a bug in a major function.

My system:
-------------------------------
OS:
  - Windows 8 RTM 64-bit

Compiler:
  - MinGW with GCC 4.6.2

Libraries/frameworks:
  - wxWidgets 2.9.4 (I only use wxWidgets for UI and threads)
  - GMP 5.05

All components were built using the stated compiler.

I thought you do not want the code to be here in the mail, so I've uploaded
it to pastebin.com:
http://pastebin.com/JSKXVQu4 - please don't worry - it is not too long, the
calculation section is just 12 LOC long.

The program calculates PI with this formula:
u_2n = 2 * n * sqrt( 0.5 - 0.5 * sqrt(1 - (u_n/n)²) );

or better using LaTex (copy the full URL!):

http://latex.codecogs.com/png.latex?\LARGE u_{2n} = 2 \cdot n \cdot
\sqrt{0.5 - 0.5 \cdot \sqrt{1 - (\frac{u_n}{n})^2}}


Many thanks in advance!!

Best Regards
ComFreek