Find the roots of a quadratic equation

//pgm to find the roots of a quadratic equation
#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
    float a,b,c,d,x1,x2,p;
    clrscr();
    cout<<"enter the values of a,b,c"<<endl;
    cin>>a>>b>>c;
    d=(b*b-4*a*c);
    if(d>0)
    {
        p=sqrt(d);
        x1=(-b+p)/2*a;
        x2=(-b-p)/2*a;
        cout<<x1<<endl<<x2;
    }
    if(d==0)
    {
        x1=-b/2*a;
        x2=x1;
        cout<<x1<<endl<<x2;
    }
    if(d<0)
    {
        cout<<"roots are imaginary";
    }
    getch();
}