C program to Find all Roots of a Quadratic equation

C program to Find all Roots of a Quadratic equation

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
    float a,b,c,d,r1,r2;
    printf("Enter the values of a,b & c\n");
    scanf("%f%f%f",&a,&b,&c);
    d=b*b-(4*a*c);
    if(d>0)
    {
        r1=(-b+sqrt(d))/(2*a);
        r2=(-b-sqrt(d))/(2*a);
        printf("Roots are real and distinct:\n%f\n%f",r1,r2);
    }
    else if(d==0)
    {
        r1=-b/(2*a);
        printf("Roots are real and equal:\n%f",r1);
    }
    else
    {
        printf("The roots are imaginary");
    }
    getch();
}