C++ : read coefficient of quadratic equation and finds all its roots

#include<iostream>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
using namespace std;
int main()
{
float a,b,c;
cout<<"Enter the coefficient of square of x : ";
cin>>a;
cout<<"Enter the coefficient of x : ";
cin>>b;
cout<<"Enter the value of c : ";
cin>>c;

float r1=0.00,r2=0.00;

if((b*b-4*a*c)<0)
   {
cout<<"\nImaginary Root Occurs";
getch();
exit(1);
}

float rr=sqrt(b*b-4*a*c);
r1=(-b+rr)/(2*a);
r2=(-b-rr)/(2*a);
cout<<endl<<endl;
cout<<"The first root is : "<<r1<<endl;
cout<<"The second root is : "<<r2<<endl;
getch();
return(0);

}