#include <stdio.h>
#include <stdlib.h>
#include<math.h>
#define EPS 1e-6
int main(void) 
{
	float a,b,c,disc,p,q;
    printf("请输入一元二次方程的系数a,b,c:\n");
    scanf("%f,%f,%f",&a,&b,&c);
    if (fabs(a)<=EPS)
    {
       printf("这不是二次方程\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\n",p,q);
       printf("x2=%.2f-%.2fi\n",p,q);
       } 
} 
	return 0;
}