catch(Equation_Exception e) { System.out.println(\方程无根\ }
}
static void result(double a,double b,double c) throws Equation_Exception
{
double s; s=b*b-(4.0*a*c);
if(s<0) throw new Equation_Exception();
方
程
的
根
为
\
和
else if(s>0); System.out.println(\
\
}
}