diyiti

#include<stdio.h> 
#include<math.h> 
int main(void) 
{ 
    double a,b,c,d; 
    double x1,x2; 

    scanf("%lf %lf %lf",&a,&b,&c); 
    if(a==0) 
        printf("Error!");
	else if((a==0)&&(b==0)&&(c==0)) 
            return 0;
	while(a!=0){
		scanf("%lf %lf %lf",&a,&b,&c);
        if(b*b-4*a*c<0) 
            printf("No,solution!"); 
        if(b*b-4*a*c==0) 
            printf("x1=x2=%.6f\n",x1=x2=-b/2*a); 
        else{
            d=sqrt(b*b-4*a*c); 
            printf("x1=%.6f\n",(-b+d)/2*a); 
            printf("x2=%.6f\n",(-b-d)/2*a); 
		}
	
	}
	return 0;
}