求根——c语言

#include<stdio.h>

int jiefangcheng(double a,double b,double c)
{

    if(b*b-4*a*c<0)
    {
        return 0;
    }
    else if(b*b-4*a*c==0)
    {
        return 1;
    }
    else if(b*b-4*a*c>0)
    {
        return 2;
    }
}

int main()
{
    double a,b,c;

    scanf("%lf%lf%lf",&a,&b,&c);
    printf("%d\n" ,jiefangcheng(a,b,c));
    return 0;
}