g++ 3.4.2 strange behavior

[Paul Schneider]

Hello,

I'm very confused by the output of the following program compiled with 
g++ 3.4.2 in Gentoo Linux:

#include <iostream>
#include <cstdlib>

using std::cout;
using std::endl;

class Hello {
public:
	Hello(double a, double b, double c) : 
aNumber(static_cast<size_t>((b-a)/c)){}
        size_t const number() const { return aNumber; }
        private:
                size_t const aNumber;
};



int main(int argc, char *argv[])
{
        Hello hello(0.0, 1000.0, 0.01);
  cout << hello.number()  << endl;
  cout << static_cast<size_t>((1000.0 / 0.01)) << endl;
  cout << static_cast<size_t>((1000.0 - 0.0) / 0.01) << endl;

  return EXIT_SUCCESS;
}

TThe output:
99999
100000
100000

where it should be 100000 straight in my opinion. What am I doing wrong.