#include<stdio.h>
#include<math.h>

void main()
{
    float a,b,c,delta,x,y,root1,root2;
    
    printf("enter the value of first variable");
    if(scanf("%f",&a)==1)
    {
        printf("enter the value of second  variable");
        if(scanf("%f",&b)==1)
        {
            printf("enter the value of third variable");
            if(scanf("%f",&c)==1)
            {
                delta=sqrt(pow(b,2)-(4*a*c));
                    if(delta>0)
                    {
                    root1=(-b+delta)/(2*a);
                    root2=(-b-delta)/(2*a);
                    printf("\n\n root1=%5.2f",root1);
                    printf("\n\n root2=%5.2f",root2);
                    }
                    else
                    {
                    printf("roots are imaginary");
                    }
            }
            else
            {
            printf("error,enter correct value");
            }
        }
        else
        {    
        printf("error,enter the correct value");
        }
    }
    else
    {
    printf("error,enter coreect value");
    }
    
    
    
}

===============================OUTPUT==============================

enter the value of first variable :1.5
enter the value of second  variable :3.5
enter the value of third variable :-15

 root1= 2.20

 root2=-4.54