c program to find the roots of a quadratic equation

c program to find the roots of a quadratic equation

c program to find the roots of a quadratic equation using if else

here is c program witch is calculate the root of Quadric equation 

find the roots of a Quadratic Equation
#include<stdio.h>
int main()
{
    float a,b,c,d,realp,imgp,r1,r2;
    printf("Enter the  3 number \n");
    scanf("%f %f %f",&a,&b,&c);
    if(a==0|| b==0|| c==0)
    {
        printf("Error the input only non zero numbers\n");

    }
    else
    {
        d=b*b-4*a*c;
        if(d==0)
        {
            printf("Rootre are Equal \n");
            r1=r2=-b/(2*a);
            printf("root 1=%f,root2=%f",r1,r2);

        }
        else if(d>0)
        {
            printf("roots are real & distinct\n ");
            r1=(-b+sqrt(fabs(d)))/(2*a);
             r2=(-b-sqrt(fabs(d)))/(2*a);
             printf("root1=%f,root2=%f",r1,r2);


        }
        else
        {
            printf("Root are a imaginary \n");
            realp=-b/(2*a);
            imgp=sqrt(fabs(d))/(2*a);
            printf("root1=%f+i%f,%f-i%f",realp,imgp,realp,imgp);

        }
    }



}