#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define ESP 1e-6
int main(void) {
	float a,b,c,disc,p,q;
printf("Please enter the cofficients a,b,c:");
    scanf("%f,%f,%f",&a,&b,&c);
    if(fabs(a)<=ESP);{
    printf("It is not a quadratic equation!\n");
    exit(0);
}
    disc=b*b-4*a*c;
    p=-b/(2*a);
    q=sqrt(fabs(disc))/(2*a);
    if(fabs(disc)<=ESP){
    prinyf("x1=x2=%.2f,x2=%.2f\n",p);
}
    else {
      if(disc>ESP){
        printf("x1=%.2f,x2=.2f\n",p+q,p-q);
    }
    else 
    {
      printf("x1=%.2f+%.2fi",p,q);
      printf("x2=%.2f-%.2fi",p,q);
    }
  }
	return 0;
}