[openbeos] newbie problem

hello together,
until this time i only used beos. no i would like to start some programming. 
first time in beos and also in c++.
. an extract of my problem is the following piece of code:

# include <iostream>
using namespace std;

int main() {
        int x;
        float a;
        double b;
        x=10;
        a=10.12345678901234567890;
        b=10.12345678901234567890;
        cout << "\n" << x << "\n";
        cout << "\n" << a << "\n";
        cout << "\n" << b << "\n";
        cout.precision(16);
        cout << "\n" << a << "\n";
        cout << "\n" << b << "\n";
        return 0;
}

 running from console with "g++ file.cpp"
there is no error message, but when running the executable i get an
error. debugger is telling me this:

loading symbols
segment violation occurred
__overflow:
__overflow:
+0023  ec04ce77:   *        14408b    movl    0x00000014(%eax), %eax

im new, firstly in programming c++, second in programming beos apps,
so i don't really know what kind my problem ist, but will really be
happy for some help.
thanks all
  andre

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