c program to find the roots of the quadratic equation

To find the roots of the quadratic equation

#include<stdio.h>

#include<math.h>

void main()

{

float a,b,c,r1,r2,d;

clrscr();

printf("Enter the values for equation:");

scanf("%f%f%f",&a,&b,&c);

/* check the condition */

if(a==0)

printf("Enter value should not be zero ");

else

{

             d=b*b-4*a*c;

/* check the condition */

  if(d>0)

            {

                        r1=(-b+sqrt(d)/(2*a));

                         r2=(-b-sqrt(d)/(2*a));

                         printf("roots are real and unequal\n");

                         printf("%f\n%f\n",r1,r2);

             }

  else

  if(d==0)

            {

                        r1=-b/(2*a);

                         r2=-b/(2*a);

                         printf("roots are real and equal\n");

                         printf("root=%f\n",r1);

                          printf("root=%f\n",r2);

  }

             else

                         printf("roots are imaginary");

    }

    getch();

}