Hey guys I am a newbie with C++, and I am trying to write a program that calculates the roots for the quadratic equation, with one restriction. The value for a must be bigger than 0. I wrote the program compile it and it is working, but when I go the .exe file and open it, the program starts it allows me to enter the values for a,b, and c and then when it should display the discriminant the console windows just exits, no error messages nothing. I tried changing “int main ()” to “void main ()” without effect. When I go to debug and start debugging at the debug window a message is displayed :

Loaded 'ntdll.dll', no matching symbolic information found.
Loaded 'C:\WINDOWS\system32\kernel32.dll', no matching symbolic information found.
The thread 0xC10 has exited with code 0 (0x0).
The program 'C:\Documents and Settings\HQZ\My Documents\Documents\In Progress\CSC 2311\Debug\Project 1.exe' has exited with code 0 (0x0).

And here is the actual source code:
Code:
#include <iostream.h>
#include <math.h>
#include <iomanip.h>

int main()

{
	double a, b, c, discr, x_1, x_2, discr_1;

	cout<<endl;
	cout<<"ax^2 + bx + c"<<endl<<endl;
	cout<<"Please enter the values for a, b, and c using the format above."<<endl<<endl;

        cout<<"Please enter value for a: ";
        cin>> a;

        while (a <= 0)
	{
		cout<<endl<<"The value for a must be larger than 0"<<endl;
		cout<<endl<<"Please enter a new value for a: ";
		cin>> a;	
        }
	
	cout<<"Please enter value for b: ";
	cin>> b;		

	cout<<"Please enter value for c: ";
	cin>> c;

	discr = b*b - 4*a*c;
	cout<<endl<<"The discriminant for the equation is: "<<discr<<endl<<endl;

	if (discr <=0)		
	{
		cout<<"The value for the expression is not in the real numbers!"<<endl<<endl;
	}
	
	else
		discr_1 = sqrt(discr);

	x_1 = -b+discr_1;
	x_2 = -b-discr_1;

	cout<<"The two roots of the quadratic equation are:"<<endl<<endl<<endl;	
	cout<<setw(30)<<x_1<<endl;			
	cout<<setw(30)<<x_2<<endl<<endl<<endl;	
	
	
	return 0;
}

Thanks