#include
#include
void main ()
{
\x05double a,b,c,x1,x2;
\x05printf("please enter a,b,c:");
\x05scanf("%lf,%lf,%lf",&a,&b,&c);
if (a==0)
\x05 printf("x1=%f",x1=(-c)/b);
\x05else if (b*b-4*a*c>0)
\x05printf("x1=%f,x2=%f",x1=((-b+sqrt(b*b-4*a*c))/2*a),x2=((-b-sqrt(b*b-4*a*c))/2*a));
\x05else if (b*b-4*a*c==0)
\x05printf("x1=%f",x1=(-b)/2*a);
\x05else printf("有两个共轭复根\n");
}
即a==0,你在运行一次,有问题再问》