引用:

/*****************************************************************
** HighlightCodeV3.0 software by yzfy(雨中飞燕) http://yzfy.org **
*****************************************************************/
#include<iostream>
#include<cmath>
void findroot(double a,double b,double c)
{
    double disc = b*b - 4*a*c;
    if (a==0) std::cout<<"x="<<-(c/b)<<std::endl;
    else if (disc==0) std::cout<<"x1=x2="<<(-b)/(2*a)<<std::endl;
    else if (disc>0)
        std::cout<<"x1="<<((-b)+sqrt(disc))/(2*a)<<"\t"<<"x2="<<((-b)-sqrt(disc))/(2*a)<<std::endl;
    else if (disc<0)
        std::cout<<"x1="<<(-b)/(2*a)<<"+"<<sqrt(-b)/(2*a)<<"i"<<"\t"
        <<"x2="<<(-b)/(2*a)<<"-"<<sqrt(-b)/(2*a)<<"i"<<std::endl;
}
int main(void)
{
    double a,b,c;
    std::cin>>a>>b>>c;
    findroot(a,b,c);
    system("pause");
    return 0;
}