入门小白一夜白头，原因竟是.............

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

int main()
{
    float a,b,c,temp;
    float x1,x2,i;

    while(1)
    {
        printf("请输入a,b,c:");
        scanf("%f%f%f",&a,&b,&c);
        if(a<=0.0001&&a>=-0.0001&&b<=0.0001&&b>=-0.0001&&c<=0.0001&&c>=-0.0001)
            break;

        temp=b*b-4*a*c;
        printf("方程%fx*x+%fx+%f的解是：",a,b,c);

        if(temp>=0)
        {
            x1=(-b-sqrt(temp))/2/a;
            x2=(-b+sqrt(temp))/2/a;
            printf("x1=%f,x2=%f\n\n",x1,x2);
        }
        else
        {
            i=sqrt(-temp)/2/a;
            x1=-b/2/a;
            printf("x1=%f+%fi,x2=%f-%fi\n\n",x1,i,x1,i);
        }
    }
    return 0;
}