Lab Program 2

//Program 2
#include<stdio.h>
#include<math.h>
void main()
{
    float a,b,c,d,root1,root2,real,imaginary;
    goto input;
    input:
    {
        printf("Enter the values of a, b & c of the quadratic equation ");
        scanf("%f%f%f",&a,&b,&c);
    }
    if(a==0)
    {
        printf("\nThe value of a cannot be zero. It is not a qadratic equation. Try again\n\n");
        goto input;
    }
    d=(b*b)-(4*a*c);
    if(d<0)
    {
        printf("\nThe roots are imaginary ");
        real=(-b)/(2*a);
        imaginary=sqrt(fabs(d))/(2*a);
        printf("and the roots are as follows\n R1 = %f + %fi\n R2 = %f + %fi",real,imaginary,real,imaginary);
    }
    else if(d==0)
    {
        printf("\nThe roots are real and equal ");
        root1=root2=(-b)/(2*a);
        printf("and the roots are as follows\n R1 = %f\n R2 = %f",root1,root2);
    }
    else
    {
        printf("\nThe roots are real and distinct ");
        root1=((-b)+(sqrt(d)))/(2*a);
        root2=((-b)-(sqrt(d)))/(2*a);
        printf("and the roots are as follows\n R1 = %f\n R2 = %f",root1,root2);
    }
}