Thread: Casting problem

I have a problem with casting.

I have a class Complex, where a Complex object is a complex number. The real and complex parts are floats. I sum several complex numbers, and I know that this sum is always an integer. I want to convert it to a long. The problem is that even though the sum is 11 , when I cast it to a long the result it 10. Why?

Code:

class Complex{
	float r, c; //r is the real part, c the complex; r + ci

	public:

        Complex(){
            r = 0;
            c = 0;
        }

	Complex(float real, float comp){
	r = real;
	c = comp;
	}

	float getReal(){
		return r;
	}
	
	float getComp(){
		return c;
	}
     
        //additional irrelevant functions
}


long findKm(){
      Comlex sum = //sum of several complex numbers that sums to a real number, which is an integer
      long Km = static_cast<long>(sum.getReal())
      return Km
}