#include<math.h> main(){    printf("请输入a,b,c的值：\n");    double a,b,c;    scanf("%lf,%lf,%lf",&a,&b,&c);    double result =(-b+sqrt(b*b-4*a*c))/2*a;    double result2=(-b-sqrt(b*b-4*a*c))/2*a;    printf("%lf,%lf",&result,&result2); }