#include
#include
void func(double a,double b,double c){
double p = b/(2*a);
double disc = b*b - 4*a*c;
double q = sqrt(disc)/(2*a);
double x1 = p+q;
double x2 = p-q;
printf("x1 = %f ,x2= %f\n",x1,x2);
}
int main(void){
double a,b,c;
scanf ...赋值给a,b,c
func(a,b,c);
}