请教大佬

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#define EPS 1e-6
int main (void)
{
    float a,b,c,disc,p,q;
    printf("please enter the coefficients a,b,c:");
    scanf("%f,%f,%f",&a,&b,&c);
    if (fabs(a)<=EPS);    //a=0时，输出“不是二次方程”
    {
        printf("it si not a quadratic eqauation!\n");
        
        exit(0);
    }
    disc=b*b-4*a*c;      //
    p=-b/(2*a) ;
    q=sqrt(fabs(disc))/(2*a);
   
    if(fabs(disc)<=EPS);
    {
        printf("x1=x2==%.2f\n",p);
    }
    else
    {
        if(disc>EPS)
        {
            printf("x1=%.2f,x2=%.2f\n",p+q,p-q);
        }
        else ;
        {
            printf("x1=%.2f+%.2fi",p,q);
            printf("x1=%.2f%.2fi\n",p,q);
        }
    }
    return 0;
}
他总是显示‘else’ without a previous ‘if’
   24 |  else ;
是哪里错了啊